Last post on Aug 22, 2013 at 12:43 PM
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Pontiac Grand Prix, Transmission, Sedan
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#201 of 498 95 grand prix shifts hard
May 30, 2009 (8:35 am)
Hi, I have a 1995 Pontiac Grand Prix and it shifts hard from 1st to 2nd gear. Im not much of a car mechanic i was hoping u could help me out. Mabey like a tranny flush or somthing
#202 of 498 Transmission Problems, No Overdrive
Jun 03, 2009 (10:44 pm)
I have a 1998 Grand Prix SE with 271,000 miles and until last Friday I had the most basic knowledge of transmissions. As I was accelerating from 45 - 50mph my car lurched, started making a loud whining noise and wouldn't shift into 4th gear. I was told everything from the torque converter to solenoids to replacement as possible problems/solutions. I also pulled a PO742 code: torque converter stuck on. I found if I drove in D my car had a top speed of 35mph - anything over that produced the whining noise, and had the tach hitting 3,000 when accelerating. Starting off in 3 and leaving it there I can drive like a normal person and it doesn't wind out the tach or make the whining noise, it just doesn't shift into overdrive. It's not a fix, but it helps while I get the money together to replace the trans, as at 271,000 miles this makes the most sense for me. In my search for answers I found this site, which has amazing people and information, thank you to everyone else who has posted I also found another site that shines a light onto all of our 4T65E transmission problems: http://www.tripleedgeperformance.com/4T65E_Transmission_Info.php
I hope this helps someone out there, thanks again.
#203 of 498 Re: hard shifting [fatboi]
Jun 06, 2009 (5:17 pm)
I am having the exact same problem and I'm not about to get everything under the hood replaced just to have it continue. I've had a few minor things done and none of that has helped. No mechanic has been able to tell me for sure what the problem is and since it is only an intermittent problem I have let it go on for over a year. I was just getting worried that it might eventually cause real damage so I googled the symptoms and found this sight.
Check out message # 63, 67 and others near those in this same forum. It's all about the same issues we have and they say a PCM software update from the dealership will solve the problem for about $40! But that finding a dealership who will do it is tricky. Also they had GTs so I don't know if that matters.
I called Pontiac customer service and they were completely unhelpful. I'm taking my car to the dealership on Monday so I'll give an update if there is one to give.
#204 of 498 2000 Grand Prix GT 113k
Jun 24, 2009 (8:18 pm)
To montana_cat: what Pontiac do you have?
My GP has been for 2 months bucking/hesitating when I'm going 45-70 mph up even a slight hill, randomly. No computer codes. I've had it tuned & the fuel system flushed but no help. Took it to a major GM dealer in Winston-Salem & they could get it to do it only once. Based on that the mechanic guesses that it's the torque converter. I went back today and asked them to update the PCM software. I was told it was up to date, they called Detroit. I looked the service manager in the eye and said, "So you are telling me that the software they installed in 1999 is the latest there is for my car?" and he answered yes. He then said that the only update is for the 97 GP (I printed message #63 & gave it to him so I think that's where he got that line). All this cost me $79. Here's what my invoice says:
called GM Tac. Case number 109*****. Advised car has latest calibration in vehicle. Calibration number is 9384244.
I have the full case # & the name of the person he talked to. I also know how customer support at large corporations works. And I feel the sm wanted to just get rid of me & my problem. I want to check this out. I have to keep this car for another 2 years. I have all the maintenance done, had the tran flushed at 58k. Except for this problem, it's a sweet ride and I'm in the car a lot for work.
Any suggestions? These guys will not lie saying the tran has been rebuilt, I know that. And I know no one in the business.
#205 of 498 Re: 2000 Grand Prix GT 113k [grwatcher]
Jun 28, 2009 (7:32 pm)
I have a 1999 Grand Prix GT. I wish you all the luck in the world in getting yours fixed. I agree about the sweet ride and great car - other than this transmission.
They updated my PCM finally after I had taken my car to the dealer 12 times (no joke) and spent $1,500. I was told by the service manager and mechanic who had worked on my car most of the 12 times that he (the mechanic) called Detroit and they put a new, unreleased version of the program on my car. I have not had a problem since.
So, there was a new version in late 06/early 07. But I wonder if it was ever officially released? Others have come on here after my posts and said that their dealerships tell them their software is up to date, but they still have problems. So, I don't think they have the same version that I now have.
Oh, and the torque converter/solenoid cost me $850 and still didn't fix the car. I actually had the solenoid changed three years prior when the car was doing the same thing for $400. Then I had to have the rear main seal fixed because they messed it up changing the solenoid. So, I've had two solenoids, a torque converter --- then the service manager decided it wasn't the transmission even though it was --- and tried a bunch of other stuff. It was the post that I printed off from here that finally got mine fixed.
I wish I could help you more. I guess my advice would be to try another dealership and see if they are more cooperative. I'm thinking that I got lucky and the mechanic got ahold of the right person when he called Detroit. If you have any other questions, feel free to ask. I'll try to help as much as I can.
#206 of 498 1997 grand prix se Transmission problems
Jul 13, 2009 (4:42 am)
My car a 1997 Pontiac Grand Prix SE 3800, when started and in drive will not move like its in neutral. It has shifted just fine up until about a week ago when checking the fluids i noticed that the tran fluid was low, I put the correct type of fluid and did not over fill it (I might have caught it so late?) . After that time when i would be driving for an extend period it would what i would call shift like someone who is learning to drive a manual.
#207 of 498 NO OVERDRIVE
Jul 20, 2009 (7:46 pm)
Just bought 99 grand prix GT and i like it a lot.....BUT i just noticed that when im driving on the highway my RPMs are pretty hight....70 mph little over 3000 which is way too much for overdrive....also if i put it in 3 the rpms are very similar....another simptom is when you let of the gas the rpms drop to idle...it seems like it shift in neutral and when you hit the gas again it has to come up to 3000 for it to start going again....
other than that the car shift and drive smooth and fast....
Someone please tell me there is a cheap way to fix it....
PS Love this site very informational.....:o))))
Jul 22, 2009 (12:28 pm)
Hey guys/gals. I bought a 2000 GP GT with 141k a couple weeks ago. I recently went on a small road trip (about 60 miles) and my friend and I noticed that my car was running high RPMs. Around 4000 80mph. My friend said that my overdrive might be out. Luckily I got a 18/18000 power train warranty with the car. I'm going to bring it into the shop tomorrow. I've been reading on here that a few have mentioned a hub assembly. To me I don't think that would cause the overdrive to go out. I'll let you all know what they find out tomorrow, if anything.
#209 of 498 Re: NO OVERDRIVE [redclownn]
Jul 22, 2009 (5:13 pm)
I have a GP GT 99 and my overdrive is also not working i am very interested in what you find out....I am taking my car to a pontiac place friday....im hoping its not gonna be too expensive....:o)))
Jul 23, 2009 (1:32 am)
I found this website that might help a lot of us that have the 4T65E transmission. I list a lot of problems people have listed on here.
4T65E Transmission Info..
Some things it lists are:
Neutrals at stops, Shudders on take off
Tach bounces up and down a few hundered rpm while cruising in lockup
No 4th Gear
and a few others.
Hope this helps a lot of us!