Last post on Aug 22, 2013 at 12:43 PM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Transmission, Sedan
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#82 of 498 Transmission fast/hard shift
Jul 09, 2007 (2:46 pm)
I know there is a new pcm update to correct the hard shifting but the three local dealers in my area have no clue on how to get the new program. Does anyone have the service number or any other info than can help me get this new program
#83 of 498 Re: Transmission fast/hard shift [acinder]
Jul 09, 2007 (7:27 pm)
Tell the dealership to call GM Tech Support in Detroit! That's what my dealership finally did. They installed the latest update in my car and I have not had a problem since. And the program only costs $40!
This was after I had spent $1,200 having the transmission torn apart multiple times with no avail, over a six month time frame.
Rob1997 was the one who pointed me in the right direction on the program.
Good luck! I hope you can get one of those three dealerships to call Detroit!
#84 of 498 Re: Transmission fast/hard shift [montana_cat]
Jul 10, 2007 (2:12 pm)
what dealer did you take it to? I have tried 3 different dealers and they all say the will only use the updates supplied by gm in their database ie " 2002 programming" It has been a nightmare with these guys. I even called gm customer service and they are completely clueless. They didnt even know that my pcm could be flashed If you could give me the name of the dealer you went to maybe they could point me in the right direction. All i need is the update part number or the calibration number. Was your car a gt or a gtp? Any way you could post the work order information.That would help us all out alot. Thanks the fast response.
#85 of 498 Transmisson rattleing!!
Jul 10, 2007 (3:44 pm)
I noticed recently that my tranny makes a rattle sound when I punch it on the highway. I have a 2002 GT with about 53k on it. When I drop the hammer it seems like it has less power than it used to and it will rev very high while it slow climbs in speed. Once it starts to rev high, 4-6 rpm, i can hear a rattle from underneath me. I just had the 50k eng service done a few months ago. Had the belt replaced, coolant flush, and tranny flush. A car buff buddy said it may be because I got the tranny fluid flushed. Said something about the seals and leakage or something. Could this be it? I don't want to have the tranny replaced. I've been staying safe and driving slow keeping it at 2-3 rpm, but we all know that's no fun. I've never seen so many people get pissed off on the highway in one week! Someone please help me!!! I hate this slow driving!!
#86 of 498 Re: Transmission fast/hard shift [acinder]
Jul 10, 2007 (5:31 pm)
I have a 1999 GT. Mine already had the "latest update" per GM too, but when the mechanic called technical service in Detroit they gave my car a new update that had not been released yet. This was in February of this year. I began the whole ordeal of taking it to the garage 12 times in September 2006 through February 2007.
Someone else on this message board had asked for the program/calibration number too, but when I asked the service manager, he said he didn't have one because they did it over the phone.
Here is what I can get off my my FINAL work order/receipt. I don't know if it will help.
"Check shudder under load"
"Reprogrammed to the latest update per technical assistance."
The dealership I went to is actually a Chevrolet (not Pontiac, but still GM of course) dealership in southern Ohio. I don't know where you live, or if that would be a benefit. The service manager who had been there for years recently took another job, so I'm not sure if the new one would be able to help you.
I understand the nightmare that you are going through all too well. I have actually been through it twice. I started having this problem when the car was three years old. They replaced parts then and they replaced parts again this time for lots of $$$ before we finally found the problem.
#87 of 498 Re: Transmission fast/hard shift [montana_cat]
Jul 10, 2007 (7:39 pm)
I am beginning to think that GM is keeping the update a secrete because they dont want to get sued. Just think of all the owners who were told their transmissions needed to be rebuilt and it was actually a faulty program. I am going to have the dealer call gm and say they rebuilt the trans once and now they are having the problem again. I figure the cars that have gone through the rebuild already are the only ones they are releasing the update to.
#88 of 498 Re: 2001 Grand Prix Transmission GT [gt0102]
Jul 16, 2007 (6:40 am)
GT0102 or anyone, please help! I am having the exact problem on my '99 GT, the Tach will randomly shut off, causing a surge, and the TRAC OFF light comes on simultaneously. Sometimes when this happens, it also kills the engine, just did it yesterday going 60 mph. My brother in law is a mechanic and has tried everything, but nothing is working, does anyone know what the source of the problem is?? HELP!
#89 of 498 GTP transmishion and speed control issues
Jul 28, 2007 (7:17 pm)
hey maby some one can help me out with this problym ive ben haveing on my 1997 grand prix gtp. At first my transmishion was acting up on me shifting very hard and sliping once and a while, aslo my speedomiter drops down to zero when i give it a little gass and the transmishion ingages. i tried replaceing my speed control sencor and it fixed tha problym with the hard shifting but my speedomiter still only works while my car is coasting and not when im giveing it any power.
The only mods. that i have done to the car are a short ram intake, throttle body spacers, smaller pullys and a transmishion intercooler.
Any help with my situation would b greatly apprecieated.
#90 of 498 Re: Transmission fast/hard shift [coblur]
Jul 31, 2007 (11:43 am)
My 00 GP GT did the same thing, My brother is a parts manager at our local GM place and I let him take it to work one day and he put the computer on it and it come back with a Tranny Code not sure what the code was, but the code had something to do with a pressure sensor under the side cover on the driver side of the transmission. The service Engine light never came on, but he cleared the code out anyway, and it didn't do it for almost a month, and one day on my way to work I stopped at a red light and when i took of BOOM hard shifting started again, every time i stop it and take off it shifts hard from 1st to 2nd.. I wasn't really worried about it, until I started to notice when It shifted hard from 1st to 2nd I could hear this high pitch WINE inside the tranny, So i took it back to the GM place, and we hooked the Tech 2(Tech2 is a computer that most GM places have that can tell you near about everything the car is doing)>> up to my car and drove it around town as we monitored the transmission with the tech 2 when it was shifting hard the tech 2 was showing the transmission pump was putting out to much pressure causing the pump to wine, So with the previous code that was on the computer a month ago that was showing up a pressure sensor error, pressure to high or low, and know seeing that the tech 2 was showing to much pressure I had the pressure sensor changed, and it fixed the problem.. The the problem first started the car had 85k miles on it, It know has 143k on it and transmission works great......
#91 of 498 Re: Transmission fast/hard shift [acinder]
Jul 31, 2007 (7:55 pm)
acinder, let me know how it turned out.
I was signed up for e-mail updates when someone else posted on this forum, but it hasn't been e-mailing me.