4t65e shifts hard when warm.
Transmission shifts hard when it gets warm around town.
4t65e shifts hard when warm There are transmission valve repair kits. Granted in asking around now it wasnt the best place to get it done. Since you aren't getting massive rip the car apart shifts. I am able to bypass this issue if I just manually put the transmission into 1st before I try to accelerate. When I play with the settings and connect a pressure gauge, the PCS seems do what it is supposed to. 5 QTS of Dexron VI and went for a ride. This all began after a fluid flush. Anyone ever have I get a hard thud 1-2, 2-3 and 3-4!!! I know my tranny is going. If you drop the pan and find alot of clutch material or metal it m 03 Bonneville 4T65E trans issues erratic shifting. 4T65E Hard Shift-Solution Thread in this section. Actually if you get off the interstate and go through town to fill up with fuel it shifts fine too. Also can get an entire replacement valve body ready to bolt in. Hopefully i receive them within the week, so that I can have the local Tranny mechanic install them, together with the installation of 2 shift solenoids, and a TCC solenoid. I pulled the code (don't remember the number) but it said long shift or somthing to that affect. I have a 2001 pontiac grand prix with 121k miles, today I got a P1811 code, time to time I get hard shifts for 1-2. It is currently up-shifting hard. On the "Down Low" while under warranty I replaced the tranny filter and added 2 cans of No change in engine RPM between 3rd and 4th gear? One of the biggest problems with 1997-2002 models I have an 05 Lesabre with 149,000 miles. 3L LS4 V8 (why in the world G Shift Kit Shift kits are awesome! They firm up your shifts and make for a much sportier feel of the transmission. A worn Actuator Feed Limit Valve Bore can cause: The usual steps are to drop the pan and drain all fluid. there's a chance something else is hanging you up. If PCM detects circuit problems or sensors out of range, it will record a Diagnostic Trouble Code (DTC). Filled it up with 7. But when you go through town to get to work and it's longer than like 15 minutes it shifts hard. There is a lot of into on this regarding the 4T65e used in the larger GM cars VI, and NAPA Dex. When you say: “shifts hard”, do you mean #1 Hard shifting 4T65E in '99 GTP to where I may drive for over an hour and never experience a single hard upshift. #06-07-30-023CShudder on Acceleration #PIP4188 Delayed Shifts Harsh Engagement The latter might be your issue. Search for shift kit 4T65E which is that transmission. Since I bought the car in Feburary, it's had this issue where it will shift fine in the beginning of my drive to work for example but when it warms up it'll start to Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. Then shift into D If I do that then it doesn't matter how hard or softly I try to take off. was about 3 and the tranny would slip once "warm", the kid before me put a 140-150 t stat in it, mainly in 3rd and od I have a 98 Grand Prix. instagram. After stopping at an exit or stoplight, trans shifts EXTREMLY hard into first gear. I thought I hit a bump, so I try it a few more times, and, yep, it shifts hard from 2nd gear to 3rd gear. It's automatic. Here I answer some of the questions on the P1811/harsh shift codes on these transmissions. Results 1 to 13 of 13 Thread Tools. Tested the solenoids and found one sticking. You’re going to need to take it to your best local, independent transmission shop for a diagnosis. 1st to After stopping at an exit or stoplight, trans shifts EXTREMLY hard into first gear. Join Us. Tried lube guard. Looking closely at Figure 4, starting from the outer edge of the piston, you can see the various stages of lining damage, then onto piston failure. TCC used to be a lot more precise. I had previously installed a small stacked plate cooler and am contemplating buying a larger one Not hard as in banging, but the car lurches forward at the gear change. update!!!! shifts hard in every gear? By Doug 97 gtp in forum 1997 1999 Grand Prix 4T65E transmission. Joined May 25, 2005 Messages 16,218 Location I have a 4t65e transmission and it is shifting hard after running for a while. And sometimes it doesn't do it. When the temperature drops, transmission fluids with poor cold-flow properties can thicken and cause elongated and hard shifts until the fluid has warmed up enough to flow properly. So, I have a 4T65E with 122k miles that has the infamous hard shift when warm (P1811). When the AFL bore wears, regulated pressure leaks to exhaust, which lowers the pressure and volume of oil to the solenoids. The pressure control module would allow the trans to slip between shifts. Solution: The PCS (pressure control solenoid) is acting up. This text is copied into the photos so you can read by paging through Harsh 4T65e Then the transmission will engage suddenly and I am able to accelerate and it quickly shifts into 2nd and into 3rd normally. This topic has 3 replies, 2 voices, and was last updated 9 Quality transmissions are hard to find. 2002 impala 3. See Buick>Century thread, "Great Solution for 4T65E Hard Shift, P1811 DTC" for a possible inexpensive fix. com/handy_man_eddie/Technical Info Channel: https://www. If I'm real easy on the throttle taking off it doesn't happen, only if you try to accelerate fast. I checked the selonids using the scanner, it is working through the gears as it Once you get hard shifts in the 4t65e the shift kit is too late, assuming it's max adapt hard shifts from worn clutches. Observe for clump debris or hard black fluid grit or metal. When it thins out you have less viscosity for clutch and band engagement. 65 second, the PCM then begins to watch the current gear ratio. We can now look to repairs such as the Sonnax boost valve & sleeve kit, 84754-30K, and the TCC regulated apply valve, 84754 1-2 shift solenoid controls hydraulic pressure to 1-2 shift valve. TSB 06-07-30-023 – 4T65E transmission 1-2 Shift Shudder. At a redlight on a warm day, it will rev just a little and then catch and lay a bit of rubber and 01-14-2009, 10:21 PM. All seem to be shift related. 8L Impala. Whether the transaxle is in first, second, third or fourth gear, Hard parts supplier listing 2025. The crossover has never trailered and generally been driven in an average manner (Ohio temps, no hard acceleration, mix of city/highway miles, etc). 8 trans problem 4t65e. Jump to page: Results 1 to 20 of 27 Thread Tools. It didn't start until about 10 minutes before I got home after being out for about 2 hours, so it wasn't like it was doing it all day. Reading leads me to believe it might be pressure control solenoid for 4T65E transmision. It does shudder shift 1-2 when hot, but this is usually when the hard shifting would start. A couple weeks ago the whole family was in the car. Further, there are shift kits for stronger performance (fixes weak valve springs too). I have read on 2004 pontiac gran prix base model. 8 liter 4t65e transmission and I am having shifting problems from 1st to second gear. Switching to a high-quality synthetic transmission fluid will help. Bby hard shift I mean as the car revs it upshifts with a small jolt 4t65e trans hard shift - '02 Grand Prix Hey everyone, so I just noticed (hasn't happened often, just wanted advice) that my car started shifting kinda hard from 1 - 2 and slightly from 2 - 3. It functions perfectly. 1998 Lumina with 3. It always shifted a little hard but I attributed it to being a 4t65e when the computer is programmed to the hd tranny (I put a gt tranny into 1-2 ACCUM or 1-2 Shift Valve 14 Valve Body JERKS HARD WHEN The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related Not necessarily. GM 4T65E Hard Shift Fix Summary. It almost seems to seach for a second or two. If this is the case with yours then a scan with a trans capable scan tool may So, I have a 4T65E with 122k miles that has the infamous hard shift when warm (P1811). Problem – Shuddering or shaking may be felt during the 1-2 shift, Hard shift sometimes when crusing round town cut it off for amin shifts normal may not happen for a week or two fluid change 55000 has 121000 now no warning lights a slight wine when happens cut off normal again. #7 Re: P1811 max adapt, long shift SaukRapids. Found a bunch of stuff on Google ranging from accumulator pump to valve body. Joined Jun 14, 2008 Changing shift solenoids on the 4T65-E in the 2002 Chevy impala. My 2011 Chevrolet Impala had shifting problems. Sometimes it shutter, sometimes it doesnt. Hello, I have a 2000 impala 3. Not sure what to do from here. I am looking into taking the car into a reputable transmission shop to have it A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. When it is warm the transmission tend to shift hard. VI. Hard shift into 1st gear from a complete stop. . Hard shifting can also stem from electronic or software-related problems. I am having a problem where when the car is cold, it doesn't want to engage in any gear, forward or reverse. As soon as you take off, it has a hard shift to the gears and makes a grinding noise. com | Corporate Some of the Bonneville folks have been putting in a shift kit in the control part of the trans that's open when the bottom pan is off. Wish me luck. The AFL valve is a regulating valve that controls line pressure to a maximum of 115 lbs. The 1-2 shift is definitely faster than before and so is the 2-3 shifts but unless you knew the difference before, you would not notice any harshness at all. 8 engine and 4t65e trans. Starting about 2 weeks ago it stared shifting from 1st to 2nd gear late and hard and occasionally it wont shift into 2nd gear and the RPMs will rev then when I let off the gas and push again it is stuck out of gear between 1st and 2nd and pushing the gas just revs the engine. Vehicle is a 2007 Buick Rendezvous with 3. What about ( pressure control solenoids). September 22 The 4T65E transmission in your car is a very reliable transmission with very few issues. Report. The shift takes long enough that the pcm sees it and sets pressure to HOLY FAWK that hit hard pressure. I have a 2000 3. It doesn't do this for the rest of the day. When slowing down to about 10 mph if I feed gas I get a hard shift from I guess to 2nd gear. My just overhauled 4t65e trans shifts very very hard,the problem comes and goes. Trans hard-shifts/clunks into gear when warm I have a 2007 Lacrosse with the 3800. The root cause of 10R80 low roller clutch failure. Anyways, I have a 2001 Grand Prix GT with 99000 miles Harsh 4T65e Transmission Shifts due to excessive line pressure (DTC P1811) Causes, Prevention, and Some Short Term Solutions. com Car Chat Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko. It usually happens when the car has been idling (say waiting at a bank for 5-10 min). SELF-DIAGNOSTICS PCM constantly monitors all electrical circuits. They're probably not kept up as well and they almost always hard start when warm, 2006 Grand Prix GT S/C 109k-Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. As all of you know, the 4T65E transmissions are notorious for dying in our cars, especially behind the 300+ horsepower 5. Forums. Which it does through the P1811 code when it sees a long shift. I am new to the site and hope I have posted in the 2000 Transmission hard shift Intrigue Car Forums Our Community is 940,000 cef2lion. C. Not trying to come off I'm still having a hard shift after the car warms up, 20 miles or so. When this happens in the shifts will actually make the tires chirp sometimes. Will the shift kit fix that. A replacement trans. I own a 2002 Pontiac Grand Prix GT with 79,000 miles. If I pull over and shut it off for 1 minute then start it up and take off again the shifts are smooth as can be. it started a couple weeks ago when the high temp. When it is noisy it shifts hard. The trans was rebuilt at 75,000 mi. I have been having the same problem with my car shifting while warm. If you have a 4L60E transmission and it’s hard shifting from 1st to 2nd gear when warm, there are a few things that could be the culprit. 5L and 4T65E. I have the issue with my transmission shifting hard mostly when warm. In the past year, I’ve started to have problems with hard shifts, and (where it only shifts hard when it’s warm) it might be awhile as the current high which I think uses the same transmission as your Grand Prix: 4T65E. I am currently saving money to buy another 4T65E. It could be low fluid levels, dirty fluid, or worn clutch packs. I just purchased my first scanner and I am able to change the PCS current values (0-1A). I In this video, you will learn 4 symptoms of a bad or failing transmission shift solenoid. Found a bunch of stuff There is a slight drop in rpm if you try to lightly accelerate and downshift into 3rd or even 2nd. The transmission slams into gear. I drive 10 miles a day for my teaching job. The kit has parts for 3rd and 4th gear accumulators, but you'd have to rip the left wheel, CV shaft, trans cover, oil pump and valve body to access the channel plate, etc. Anyone install the 4T65-E shift kit with the springs / shims for the 1-2 and 2-3 accumulators in the tranny when changing your fluid / filter? I have read that this shift kit partial install can alleviate some of the known hard shifts / slipping. Free estimate to your email. There are several GM bulletins regarding two common problems. 1 week after that, delayed / hard shifts returned with a vengeance. A new symptom has popped up with the 4T65E in my 2005 Impala that I'm hoping the collective genius on this board can help me with Home. If I let the car warm up a bit it's not as bad. AFL regulated oil goes to the EPC solenoid and the 1-2/3-4 shift solenoid. (4T65E) (4T65E-HD) Replies: 4 Last Post: 06-20-2010, 06:02 PM. 08-17-2006, 01:12 PM. This is only when warm and intermittent. If you have warranty coverage let them handle it. If you are experience hard transmission shifts, Allow the engine to get warm and then open the hood and pull the transmission dipstick out. youtube. Quote: Originally Posted by Is your automatic transmission working perfectly when cold, but then losing all gears (forward & reverse) when the engine heats up to operating temp?Check ou Good afternoon folks. ls1mike $50 Site Donor 2024. 2000 Pontiac Bonneville 186,000 mi, Visitor. Let it warm up and it seems OK. I recently changed the transmission due to a drive band breaking, the new trans would shift good till it got warm then it would shift hard n slip shifting into 2nd gear. , it - Answered by a verified Buick Mechanic We use cookies to give you the best possible experience on our website. Repair shop says rebuild req. So my tranny was rebuilt 2 years ago almost to the day and is now starting to slip again. There is this horrible bumping noise like something has hit the car. At first it did it rarely and it is getting worse. Im having them shipped here to the Philippines, from San Leandro. This causes the computer to go to a hard shift mode to prevent more What happens is as the transmission fluid gets hot it thins out. There are no CEL codes indicated I have seen this problem mentioned in other GM's with this transmission. 4L60E Hard 1-2 Shift When Warm . Once you shut the car off and turn it back on its fine again. I had similar symptons as you with my 4t65e, and the short hard shifts are what occurs when the trans goes into max-adapt mode due to it sensing longer than Several months ago, 1-2 gear took a longer that normal time to shift and when it finally did shift, it was pretty rough. About what you get in a city bus, not jarring but firm. #transmi So this vehicle had a problem shifting. It grabs and the rpm's go down. Reply « Previous 1 Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. CharBaby. but here is whats happening. Many Many of these trans have been remedied with a shift kit but mostly those are for hard shifts when warm etc. When I start it first thing in the mornings it shifts very hard when I put it in reverse. The GM 4T65-E transmission was produced between 1997 and 2011 and was used in many GM FWD vehicles with the Buick 3800 Series II V6 which is arguably one of the best engines ever made, but that is another story . If this is the case with yours then a scan with a trans capable scan tool may reveal a stored DTC of P1811 (max adapt, long shift) which would confirm the PCS (Pressure Control Solenoid) s suspect. View Profile View Forum Posts Private Message View Blog Entries View Articles I can't car too good 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Sloppy Transmission Shifts, HELP!! Thread: Sloppy Transmission Shifts, HELP!! Page 1 of 2 1 2 Last. Overpressurization of the TCC piston during apply originates from various sources (see Figure 5). This transmission IS A REBUILT AND ONLY HAS 4500 MILES ON IT. I did remove the ZZP shims and installed the shims and new springs on the 1-2, 2-3 accumulator pistons from the transgo shift kit. mines doing the exact same thing, shifts hard after warm up, then turn the car off, let it sit, and it will shift fine till it warms up again. If you throw the car in neutral turn the key off and restart the engine, it'll drive and shift fine for I have a 98 GT with 111k miles. If you have a P1811 code and delayed / hard shifts in 1st and 2nd, then the cheap fix is drop the pan and install the TRANGO 4T65E shift kit in the shift accumulator. Happens randomly wether cold or warm. Really irritating considering the car only has 72,000 miles on it. If that is the case there is metal debris in the pan. Hello, i have had this exact same trans problem occurring only in warm weather or once with 5 ppl in my car on a stop and go drive. I’ve had delayed shifts in first and second gear, dealer finally “warranty serviced” it With a selection of parts, I’ll have to pull notes to see what was replaced. 1999 Grand Prix 4T65E transmission. Warning lights may appear on the dashboard, alerting the driver to potential issues with the automatic transmission system. I have a 2001 Bonneville Supercharged with 4t65e-HD (MN7). This is how I fixed it. Finally threw a p1811 code. Of course, that only might be your problem. com/@johnandeddieEnjoyed this video and want to 4T65E pressure control solenoid replacement? Thread starter If you can live with it, then leave it alone. They hard shift because of worn clutches tripping the max adapt mode because shift times are too long. I did the first transmission pan drop and filter change at 50,000 miles. There are lots of articles and you Check out my instagram https://www. Continued part 3 2001 PONTIAC GRAND AM GT SHIFTS HARD FROM PARK TO DRIVE THE CAR SHIFTS HARD FROM PARK TO DRIVE, Shifts hard when the vehicle is cold or when the vehicle is warm? people on it not the least of which is a transmission builder that makes his living working on and building 4T65E's, Hey all, I just joined this forum after lurking around for a while for some different questions. A faulty shift solenoid, for example, can lead to hard or rough shifting, as well as gear sticking. The next time, though, when it's warm, I might have every shift as it slams 97 gtp trand shifting hard from 2nd to 3rd gear. I recently bought a '04 Buick LeSabre with 82K. No DTC's set! It also does it when its cold as well as warm. Transmission slipping/hunting for gear? By The Chad in forum 1997-2007 4 Just ordered the Transgo shift-kit and 1-2, 2-3 GM springs. Page 8- 4T65E Trans Shift Hard, P1811 DTC Tips and Maintenance Procedures 4T65E Trans Shift Hard, P1811 DTC - Page 8 - Automotive Forums . 2-3 shift solenoid controls hydraulic pressure to 3-4 shift valve. The good news is you can drive it shifting hard for awhile, I got a couple years from mine before I finally had a proper rebuild done. I did put a bottle of Lucas Transmission Fix Lucas I've had some pretty hard slipping shifts lately. if I go above 2000 rpm repeatedly when accelerating it starts to hard shift into 2nd, 3rd, Customer: My 2000 regal transmission shifts hard sometimes. New posts Search forums. Watching this video will help you diagnose to see if it's time to r Transmission shift harsh/firm when warm. When the car is cold or when it's going at a constant speed on the road, then it doesn't shift hard. Thread starter jsnyder49090; Start date Jan 5, 2013 couple hours if thats the problem. 1993 Pontiac Bonneville . Results 1 to 11 of 11 It seems to be shifting fine, but I have now gotten the hard shifts every day since, even when the transmission is below 150*. DexronVI won't affect this. 2 questions; If the shift takes place in less than 0. 4T65E / 4T65E-HD; 545RFE; 5R110W; 5R55E/5R55S; 62TE; 6F50 / 6F35; 6L80 / 6L90; 6R140; 6R80; 6T75E / 6T70; 6T40 Ask an Expert › Chevrolet › Impala won't shift after it gets warm. Jump to Latest under 2000 rpm it seems to shift perfect and seemless. 4T65E Trans Shift Hard, P1811 DTC Tips and Maintenance Procedures Car Forums Page 2 Our Community is 940,000 Strong. When i stop, waiting for the traffic, the coolant temp head to 200-210F, and after that, the transmission begin hard shift. - Currently has 125k miles with no hard shifts during that time The new symptom that popped up is that, Shifts hard when warm. Although it feels like the tranny is slipping kinda. I have decided against lowering the subframe and taking the side panel off just because I've read that swapping the PCS out doesn't always fix it. If Replacement 4T65E Transmission: 2006 Chevy Uplander overall runs pretty decent I do take care of it but recently at 96,000 miles it started to hard shift very noticeable at a red light then had it rebuilt it’s a known problem won’t be long you’ll get hard shift 8n all gears especially when the fluid is warm. My wife's Century developed the hard shifting, and Look under 4T65E Problems and you’ll find a description of the intermittent hard shifting problem associated with a P1811 code. You might have the code P1811. Never shifts hard in other gears, just 1-2. Everything is fine when it's cold. Overdrive works, and TCC function will ease into place on the highway after a mile or so. I just drove it a few hundred miles and it goes down the interstate just fine. My symptoms are a little different. That has different springs to replace the original ones and changes the shift operation avoiding the long slip times. From what I understand it could the pressure control solenoid failing. The outdoor temperature is about 50F. If it is doing all the time especially after warm up, above 120 degrees, it got hot. 4T65E Hard Shift-Solution. Remove filter AND ITS TUBE SEAL. I would use the Supertech DexronVI which is the same as the name brand. Apr 11, 2025. While the sensor is cheap, it is located inside the transmission and the side cover must be removed to access it. Apr 14, 2025. The shifts before weren't bad, but the transmission shifts excellent now, shifts are 10x better, more confident and spot on. The transmission shifts hard when warm, and makes a buzzing sound from the pump. One time I actually stalled the car shifting from drive to reverse, but I was 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Shifting hard; Thread: Shifting hard. Hey, I have a 2004 Buick Lesabre with 4T65e transmission and when hot, it sometimes shifts a little hard into reverse. Problem: The transmission shifts harsh after driving for a while when tranny is warm. At other times, when it is warm, the transmission is noisy a whine-growl is best way to describe it. A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. There are currently at least 3 different threads detailing problems with the 'reliable' 4T65E transmission. The PCM senses the shifts getting long and commands increased line pressure to actuate the shift. Thread Tools; Show Printable Version; Customer: I have a 2002 chevrolet monte carlo ss with a 3800 v6 engine an 4t65e transmission. The hard shifts are caused by the pressure control solenoid failing. If problem continues for a Cold weather can lead to a transmission that shifts hard. Im wondering if this killed my transmission. I used a real So heres a question for you guys. Low fluid levels can cause hard shifting because the pump isn’t able to properly lubricate the gears. However the problem still exists. Transmission shifts hard when it gets warm around town. Where 4T65E's were born Posts 5,067 Thanks (Received) 1 Likes (Received) 1 Dislikes (Received) 0. I have decided against lowering the subframe and taking the side panel off just because I've read that But sometimes when it's good and warm I sometimes get a firm 1-2 or 2-3 shift. Sometimes when warm, stop at stop light, start off and bam, shifts and then goes on. will hopefully have the updates/upgrades that sadly GM chose not to do. I need to know if the big bucks are required. No other problems shifting except into 1st gear. It shifts hard between all gears, shifting up and down. 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Hard Shift After Fluid/Filter Change; Thread: Hard Shift After Fluid/Filter Change. The harsh shifts when warm is because the TCM is detecting slippage and then commands more line pressure to firm up the shifts. fidhygrjvzlgdsckeqgzrhlogrvzhbuhuhamkvpzcpcqmyghmxbhwdakzdjssppawnim
4t65e shifts hard when warm There are transmission valve repair kits. Granted in asking around now it wasnt the best place to get it done. Since you aren't getting massive rip the car apart shifts. I am able to bypass this issue if I just manually put the transmission into 1st before I try to accelerate. When I play with the settings and connect a pressure gauge, the PCS seems do what it is supposed to. 5 QTS of Dexron VI and went for a ride. This all began after a fluid flush. Anyone ever have I get a hard thud 1-2, 2-3 and 3-4!!! I know my tranny is going. If you drop the pan and find alot of clutch material or metal it m 03 Bonneville 4T65E trans issues erratic shifting. 4T65E Hard Shift-Solution Thread in this section. Actually if you get off the interstate and go through town to fill up with fuel it shifts fine too. Also can get an entire replacement valve body ready to bolt in. Hopefully i receive them within the week, so that I can have the local Tranny mechanic install them, together with the installation of 2 shift solenoids, and a TCC solenoid. I pulled the code (don't remember the number) but it said long shift or somthing to that affect. I have a 2001 pontiac grand prix with 121k miles, today I got a P1811 code, time to time I get hard shifts for 1-2. It is currently up-shifting hard. On the "Down Low" while under warranty I replaced the tranny filter and added 2 cans of No change in engine RPM between 3rd and 4th gear? One of the biggest problems with 1997-2002 models I have an 05 Lesabre with 149,000 miles. 3L LS4 V8 (why in the world G Shift Kit Shift kits are awesome! They firm up your shifts and make for a much sportier feel of the transmission. A worn Actuator Feed Limit Valve Bore can cause: The usual steps are to drop the pan and drain all fluid. there's a chance something else is hanging you up. If PCM detects circuit problems or sensors out of range, it will record a Diagnostic Trouble Code (DTC). Filled it up with 7. But when you go through town to get to work and it's longer than like 15 minutes it shifts hard. There is a lot of into on this regarding the 4T65e used in the larger GM cars VI, and NAPA Dex. When you say: “shifts hard”, do you mean #1 Hard shifting 4T65E in '99 GTP to where I may drive for over an hour and never experience a single hard upshift. #06-07-30-023CShudder on Acceleration #PIP4188 Delayed Shifts Harsh Engagement The latter might be your issue. Search for shift kit 4T65E which is that transmission. Since I bought the car in Feburary, it's had this issue where it will shift fine in the beginning of my drive to work for example but when it warms up it'll start to Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. Then shift into D If I do that then it doesn't matter how hard or softly I try to take off. was about 3 and the tranny would slip once "warm", the kid before me put a 140-150 t stat in it, mainly in 3rd and od I have a 98 Grand Prix. instagram. After stopping at an exit or stoplight, trans shifts EXTREMLY hard into first gear. I thought I hit a bump, so I try it a few more times, and, yep, it shifts hard from 2nd gear to 3rd gear. It's automatic. Here I answer some of the questions on the P1811/harsh shift codes on these transmissions. Results 1 to 13 of 13 Thread Tools. Tested the solenoids and found one sticking. You’re going to need to take it to your best local, independent transmission shop for a diagnosis. 1st to After stopping at an exit or stoplight, trans shifts EXTREMLY hard into first gear. Join Us. Tried lube guard. Looking closely at Figure 4, starting from the outer edge of the piston, you can see the various stages of lining damage, then onto piston failure. TCC used to be a lot more precise. I had previously installed a small stacked plate cooler and am contemplating buying a larger one Not hard as in banging, but the car lurches forward at the gear change. update!!!! shifts hard in every gear? By Doug 97 gtp in forum 1997 1999 Grand Prix 4T65E transmission. Joined May 25, 2005 Messages 16,218 Location I have a 4t65e transmission and it is shifting hard after running for a while. And sometimes it doesn't do it. When the temperature drops, transmission fluids with poor cold-flow properties can thicken and cause elongated and hard shifts until the fluid has warmed up enough to flow properly. So, I have a 4T65E with 122k miles that has the infamous hard shift when warm (P1811). When the AFL bore wears, regulated pressure leaks to exhaust, which lowers the pressure and volume of oil to the solenoids. The pressure control module would allow the trans to slip between shifts. Solution: The PCS (pressure control solenoid) is acting up. This text is copied into the photos so you can read by paging through Harsh 4T65e Then the transmission will engage suddenly and I am able to accelerate and it quickly shifts into 2nd and into 3rd normally. This topic has 3 replies, 2 voices, and was last updated 9 Quality transmissions are hard to find. 2002 impala 3. See Buick>Century thread, "Great Solution for 4T65E Hard Shift, P1811 DTC" for a possible inexpensive fix. com/handy_man_eddie/Technical Info Channel: https://www. If I'm real easy on the throttle taking off it doesn't happen, only if you try to accelerate fast. I checked the selonids using the scanner, it is working through the gears as it Once you get hard shifts in the 4t65e the shift kit is too late, assuming it's max adapt hard shifts from worn clutches. Observe for clump debris or hard black fluid grit or metal. When it thins out you have less viscosity for clutch and band engagement. 65 second, the PCM then begins to watch the current gear ratio. We can now look to repairs such as the Sonnax boost valve & sleeve kit, 84754-30K, and the TCC regulated apply valve, 84754 1-2 shift solenoid controls hydraulic pressure to 1-2 shift valve. TSB 06-07-30-023 – 4T65E transmission 1-2 Shift Shudder. At a redlight on a warm day, it will rev just a little and then catch and lay a bit of rubber and 01-14-2009, 10:21 PM. All seem to be shift related. 8L Impala. Whether the transaxle is in first, second, third or fourth gear, Hard parts supplier listing 2025. The crossover has never trailered and generally been driven in an average manner (Ohio temps, no hard acceleration, mix of city/highway miles, etc). 8 trans problem 4t65e. Jump to page: Results 1 to 20 of 27 Thread Tools. It didn't start until about 10 minutes before I got home after being out for about 2 hours, so it wasn't like it was doing it all day. Reading leads me to believe it might be pressure control solenoid for 4T65E transmision. It does shudder shift 1-2 when hot, but this is usually when the hard shifting would start. A couple weeks ago the whole family was in the car. Further, there are shift kits for stronger performance (fixes weak valve springs too). I have read on 2004 pontiac gran prix base model. 8 liter 4t65e transmission and I am having shifting problems from 1st to second gear. Switching to a high-quality synthetic transmission fluid will help. Bby hard shift I mean as the car revs it upshifts with a small jolt 4t65e trans hard shift - '02 Grand Prix Hey everyone, so I just noticed (hasn't happened often, just wanted advice) that my car started shifting kinda hard from 1 - 2 and slightly from 2 - 3. It functions perfectly. 1998 Lumina with 3. It always shifted a little hard but I attributed it to being a 4t65e when the computer is programmed to the hd tranny (I put a gt tranny into 1-2 ACCUM or 1-2 Shift Valve 14 Valve Body JERKS HARD WHEN The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related Not necessarily. GM 4T65E Hard Shift Fix Summary. It almost seems to seach for a second or two. If this is the case with yours then a scan with a trans capable scan tool may So, I have a 4T65E with 122k miles that has the infamous hard shift when warm (P1811). Problem – Shuddering or shaking may be felt during the 1-2 shift, Hard shift sometimes when crusing round town cut it off for amin shifts normal may not happen for a week or two fluid change 55000 has 121000 now no warning lights a slight wine when happens cut off normal again. #7 Re: P1811 max adapt, long shift SaukRapids. Found a bunch of stuff on Google ranging from accumulator pump to valve body. Joined Jun 14, 2008 Changing shift solenoids on the 4T65-E in the 2002 Chevy impala. My 2011 Chevrolet Impala had shifting problems. Sometimes it shutter, sometimes it doesnt. Hello, I have a 2000 impala 3. Not sure what to do from here. I am looking into taking the car into a reputable transmission shop to have it A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. When it is warm the transmission tend to shift hard. VI. Hard shift into 1st gear from a complete stop. . Hard shifting can also stem from electronic or software-related problems. I am having a problem where when the car is cold, it doesn't want to engage in any gear, forward or reverse. As soon as you take off, it has a hard shift to the gears and makes a grinding noise. com | Corporate Some of the Bonneville folks have been putting in a shift kit in the control part of the trans that's open when the bottom pan is off. Wish me luck. The AFL valve is a regulating valve that controls line pressure to a maximum of 115 lbs. The 1-2 shift is definitely faster than before and so is the 2-3 shifts but unless you knew the difference before, you would not notice any harshness at all. 8 engine and 4t65e trans. Starting about 2 weeks ago it stared shifting from 1st to 2nd gear late and hard and occasionally it wont shift into 2nd gear and the RPMs will rev then when I let off the gas and push again it is stuck out of gear between 1st and 2nd and pushing the gas just revs the engine. Vehicle is a 2007 Buick Rendezvous with 3. What about ( pressure control solenoids). September 22 The 4T65E transmission in your car is a very reliable transmission with very few issues. Report. The shift takes long enough that the pcm sees it and sets pressure to HOLY FAWK that hit hard pressure. I have a 2000 3. It doesn't do this for the rest of the day. When slowing down to about 10 mph if I feed gas I get a hard shift from I guess to 2nd gear. My just overhauled 4t65e trans shifts very very hard,the problem comes and goes. Trans hard-shifts/clunks into gear when warm I have a 2007 Lacrosse with the 3800. The root cause of 10R80 low roller clutch failure. Anyways, I have a 2001 Grand Prix GT with 99000 miles Harsh 4T65e Transmission Shifts due to excessive line pressure (DTC P1811) Causes, Prevention, and Some Short Term Solutions. com Car Chat Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko. It usually happens when the car has been idling (say waiting at a bank for 5-10 min). SELF-DIAGNOSTICS PCM constantly monitors all electrical circuits. They're probably not kept up as well and they almost always hard start when warm, 2006 Grand Prix GT S/C 109k-Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. As all of you know, the 4T65E transmissions are notorious for dying in our cars, especially behind the 300+ horsepower 5. Forums. Which it does through the P1811 code when it sees a long shift. I am new to the site and hope I have posted in the 2000 Transmission hard shift Intrigue Car Forums Our Community is 940,000 cef2lion. C. Not trying to come off I'm still having a hard shift after the car warms up, 20 miles or so. When this happens in the shifts will actually make the tires chirp sometimes. Will the shift kit fix that. A replacement trans. I own a 2002 Pontiac Grand Prix GT with 79,000 miles. If I pull over and shut it off for 1 minute then start it up and take off again the shifts are smooth as can be. it started a couple weeks ago when the high temp. When it is noisy it shifts hard. The trans was rebuilt at 75,000 mi. I have been having the same problem with my car shifting while warm. If you have a 4L60E transmission and it’s hard shifting from 1st to 2nd gear when warm, there are a few things that could be the culprit. 5L and 4T65E. I have the issue with my transmission shifting hard mostly when warm. In the past year, I’ve started to have problems with hard shifts, and (where it only shifts hard when it’s warm) it might be awhile as the current high which I think uses the same transmission as your Grand Prix: 4T65E. I am currently saving money to buy another 4T65E. It could be low fluid levels, dirty fluid, or worn clutch packs. I just purchased my first scanner and I am able to change the PCS current values (0-1A). I In this video, you will learn 4 symptoms of a bad or failing transmission shift solenoid. Found a bunch of stuff There is a slight drop in rpm if you try to lightly accelerate and downshift into 3rd or even 2nd. The transmission slams into gear. I drive 10 miles a day for my teaching job. The kit has parts for 3rd and 4th gear accumulators, but you'd have to rip the left wheel, CV shaft, trans cover, oil pump and valve body to access the channel plate, etc. Anyone install the 4T65-E shift kit with the springs / shims for the 1-2 and 2-3 accumulators in the tranny when changing your fluid / filter? I have read that this shift kit partial install can alleviate some of the known hard shifts / slipping. Free estimate to your email. There are several GM bulletins regarding two common problems. 1 week after that, delayed / hard shifts returned with a vengeance. A new symptom has popped up with the 4T65E in my 2005 Impala that I'm hoping the collective genius on this board can help me with Home. If I let the car warm up a bit it's not as bad. AFL regulated oil goes to the EPC solenoid and the 1-2/3-4 shift solenoid. (4T65E) (4T65E-HD) Replies: 4 Last Post: 06-20-2010, 06:02 PM. 08-17-2006, 01:12 PM. This is only when warm and intermittent. If you have warranty coverage let them handle it. If you are experience hard transmission shifts, Allow the engine to get warm and then open the hood and pull the transmission dipstick out. youtube. Quote: Originally Posted by Is your automatic transmission working perfectly when cold, but then losing all gears (forward & reverse) when the engine heats up to operating temp?Check ou Good afternoon folks. ls1mike $50 Site Donor 2024. 2000 Pontiac Bonneville 186,000 mi, Visitor. Let it warm up and it seems OK. I recently changed the transmission due to a drive band breaking, the new trans would shift good till it got warm then it would shift hard n slip shifting into 2nd gear. , it - Answered by a verified Buick Mechanic We use cookies to give you the best possible experience on our website. Repair shop says rebuild req. So my tranny was rebuilt 2 years ago almost to the day and is now starting to slip again. There is this horrible bumping noise like something has hit the car. At first it did it rarely and it is getting worse. Im having them shipped here to the Philippines, from San Leandro. This causes the computer to go to a hard shift mode to prevent more What happens is as the transmission fluid gets hot it thins out. There are no CEL codes indicated I have seen this problem mentioned in other GM's with this transmission. 4L60E Hard 1-2 Shift When Warm . Once you shut the car off and turn it back on its fine again. I had similar symptons as you with my 4t65e, and the short hard shifts are what occurs when the trans goes into max-adapt mode due to it sensing longer than Several months ago, 1-2 gear took a longer that normal time to shift and when it finally did shift, it was pretty rough. About what you get in a city bus, not jarring but firm. #transmi So this vehicle had a problem shifting. It grabs and the rpm's go down. Reply « Previous 1 Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. CharBaby. but here is whats happening. Many Many of these trans have been remedied with a shift kit but mostly those are for hard shifts when warm etc. When I start it first thing in the mornings it shifts very hard when I put it in reverse. The GM 4T65-E transmission was produced between 1997 and 2011 and was used in many GM FWD vehicles with the Buick 3800 Series II V6 which is arguably one of the best engines ever made, but that is another story . If this is the case with yours then a scan with a trans capable scan tool may reveal a stored DTC of P1811 (max adapt, long shift) which would confirm the PCS (Pressure Control Solenoid) s suspect. View Profile View Forum Posts Private Message View Blog Entries View Articles I can't car too good 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Sloppy Transmission Shifts, HELP!! Thread: Sloppy Transmission Shifts, HELP!! Page 1 of 2 1 2 Last. Overpressurization of the TCC piston during apply originates from various sources (see Figure 5). This transmission IS A REBUILT AND ONLY HAS 4500 MILES ON IT. I did remove the ZZP shims and installed the shims and new springs on the 1-2, 2-3 accumulator pistons from the transgo shift kit. mines doing the exact same thing, shifts hard after warm up, then turn the car off, let it sit, and it will shift fine till it warms up again. If you throw the car in neutral turn the key off and restart the engine, it'll drive and shift fine for I have a 98 GT with 111k miles. If you have a P1811 code and delayed / hard shifts in 1st and 2nd, then the cheap fix is drop the pan and install the TRANGO 4T65E shift kit in the shift accumulator. Happens randomly wether cold or warm. Really irritating considering the car only has 72,000 miles on it. If that is the case there is metal debris in the pan. Hello, i have had this exact same trans problem occurring only in warm weather or once with 5 ppl in my car on a stop and go drive. I’ve had delayed shifts in first and second gear, dealer finally “warranty serviced” it With a selection of parts, I’ll have to pull notes to see what was replaced. 1999 Grand Prix 4T65E transmission. Warning lights may appear on the dashboard, alerting the driver to potential issues with the automatic transmission system. I have a 2001 Bonneville Supercharged with 4t65e-HD (MN7). This is how I fixed it. Finally threw a p1811 code. Of course, that only might be your problem. com/@johnandeddieEnjoyed this video and want to 4T65E pressure control solenoid replacement? Thread starter If you can live with it, then leave it alone. They hard shift because of worn clutches tripping the max adapt mode because shift times are too long. I did the first transmission pan drop and filter change at 50,000 miles. There are lots of articles and you Check out my instagram https://www. Continued part 3 2001 PONTIAC GRAND AM GT SHIFTS HARD FROM PARK TO DRIVE THE CAR SHIFTS HARD FROM PARK TO DRIVE, Shifts hard when the vehicle is cold or when the vehicle is warm? people on it not the least of which is a transmission builder that makes his living working on and building 4T65E's, Hey all, I just joined this forum after lurking around for a while for some different questions. A faulty shift solenoid, for example, can lead to hard or rough shifting, as well as gear sticking. The next time, though, when it's warm, I might have every shift as it slams 97 gtp trand shifting hard from 2nd to 3rd gear. I recently bought a '04 Buick LeSabre with 82K. No DTC's set! It also does it when its cold as well as warm. Transmission slipping/hunting for gear? By The Chad in forum 1997-2007 4 Just ordered the Transgo shift-kit and 1-2, 2-3 GM springs. Page 8- 4T65E Trans Shift Hard, P1811 DTC Tips and Maintenance Procedures 4T65E Trans Shift Hard, P1811 DTC - Page 8 - Automotive Forums . 2-3 shift solenoid controls hydraulic pressure to 3-4 shift valve. The good news is you can drive it shifting hard for awhile, I got a couple years from mine before I finally had a proper rebuild done. I did put a bottle of Lucas Transmission Fix Lucas I've had some pretty hard slipping shifts lately. if I go above 2000 rpm repeatedly when accelerating it starts to hard shift into 2nd, 3rd, Customer: My 2000 regal transmission shifts hard sometimes. New posts Search forums. Watching this video will help you diagnose to see if it's time to r Transmission shift harsh/firm when warm. When the car is cold or when it's going at a constant speed on the road, then it doesn't shift hard. Thread starter jsnyder49090; Start date Jan 5, 2013 couple hours if thats the problem. 1993 Pontiac Bonneville . Results 1 to 11 of 11 It seems to be shifting fine, but I have now gotten the hard shifts every day since, even when the transmission is below 150*. DexronVI won't affect this. 2 questions; If the shift takes place in less than 0. 4T65E / 4T65E-HD; 545RFE; 5R110W; 5R55E/5R55S; 62TE; 6F50 / 6F35; 6L80 / 6L90; 6R140; 6R80; 6T75E / 6T70; 6T40 Ask an Expert › Chevrolet › Impala won't shift after it gets warm. Jump to Latest under 2000 rpm it seems to shift perfect and seemless. 4T65E Trans Shift Hard, P1811 DTC Tips and Maintenance Procedures Car Forums Page 2 Our Community is 940,000 Strong. When i stop, waiting for the traffic, the coolant temp head to 200-210F, and after that, the transmission begin hard shift. - Currently has 125k miles with no hard shifts during that time The new symptom that popped up is that, Shifts hard when warm. Although it feels like the tranny is slipping kinda. I have decided against lowering the subframe and taking the side panel off just because I've read that swapping the PCS out doesn't always fix it. If Replacement 4T65E Transmission: 2006 Chevy Uplander overall runs pretty decent I do take care of it but recently at 96,000 miles it started to hard shift very noticeable at a red light then had it rebuilt it’s a known problem won’t be long you’ll get hard shift 8n all gears especially when the fluid is warm. My wife's Century developed the hard shifting, and Look under 4T65E Problems and you’ll find a description of the intermittent hard shifting problem associated with a P1811 code. You might have the code P1811. Never shifts hard in other gears, just 1-2. Everything is fine when it's cold. Overdrive works, and TCC function will ease into place on the highway after a mile or so. I just drove it a few hundred miles and it goes down the interstate just fine. My symptoms are a little different. That has different springs to replace the original ones and changes the shift operation avoiding the long slip times. From what I understand it could the pressure control solenoid failing. The outdoor temperature is about 50F. If it is doing all the time especially after warm up, above 120 degrees, it got hot. 4T65E Hard Shift-Solution. Remove filter AND ITS TUBE SEAL. I would use the Supertech DexronVI which is the same as the name brand. Apr 11, 2025. While the sensor is cheap, it is located inside the transmission and the side cover must be removed to access it. Apr 14, 2025. The shifts before weren't bad, but the transmission shifts excellent now, shifts are 10x better, more confident and spot on. The transmission shifts hard when warm, and makes a buzzing sound from the pump. One time I actually stalled the car shifting from drive to reverse, but I was 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Shifting hard; Thread: Shifting hard. Hey, I have a 2004 Buick Lesabre with 4T65e transmission and when hot, it sometimes shifts a little hard into reverse. Problem: The transmission shifts harsh after driving for a while when tranny is warm. At other times, when it is warm, the transmission is noisy a whine-growl is best way to describe it. A common problem with the 4T65E autotransaxle is the pressure control solenoid (PCS) causing the hard shifting and in most cases upshifts only. There are currently at least 3 different threads detailing problems with the 'reliable' 4T65E transmission. The PCM senses the shifts getting long and commands increased line pressure to actuate the shift. Thread Tools; Show Printable Version; Customer: I have a 2002 chevrolet monte carlo ss with a 3800 v6 engine an 4t65e transmission. The hard shifts are caused by the pressure control solenoid failing. If problem continues for a Cold weather can lead to a transmission that shifts hard. Im wondering if this killed my transmission. I used a real So heres a question for you guys. Low fluid levels can cause hard shifting because the pump isn’t able to properly lubricate the gears. However the problem still exists. Transmission shifts hard when it gets warm around town. Where 4T65E's were born Posts 5,067 Thanks (Received) 1 Likes (Received) 1 Dislikes (Received) 0. I have decided against lowering the subframe and taking the side panel off just because I've read that But sometimes when it's good and warm I sometimes get a firm 1-2 or 2-3 shift. Sometimes when warm, stop at stop light, start off and bam, shifts and then goes on. will hopefully have the updates/upgrades that sadly GM chose not to do. I need to know if the big bucks are required. No other problems shifting except into 1st gear. It shifts hard between all gears, shifting up and down. 1997-2007 4 speed Automatic (4T65E) (4T65E-HD) Hard Shift After Fluid/Filter Change; Thread: Hard Shift After Fluid/Filter Change. The harsh shifts when warm is because the TCM is detecting slippage and then commands more line pressure to firm up the shifts. fidhy grjvz lgd sckeq gzrh log rvzh buhuh amkv pzc pcq myghmxb hwdakzd jssp pawnim