2008 Pontiac Grand Prix: transmission slipping

5 of the 143 complaints about the 2008 Pontiac Grand Prix describe transmission slipping.

owner complaints: 5
of this car's complaints: 3%
typical mileage: 65,000
recalls: 0

Is there a fix? 31 service bulletins cover this area of the car. See below

Transmission slipping by model year

2008
5
2007
11
2006
22
2005
7
2004
3
2003
2
2002
1
2001
2
2000
1
1999
1
1997
2
1995
1
1992
4
1990
1

What owners say

Filed Dec 23, 2013 · Transmission · 95,000 miles · IL

When driving the 2008 grand prix gxp (5.3 with a 4sp automatic overdrive) at low speed the car started shuttering and slipping in gear. Made it home slowly and pulled over and checked to ensure transmission fluid full. Call dealer to file warranty claim and tried to drive to dealer and car went 1/4 mile at 10-15 MPH and car transmission went completely out. No gears in reverse, drive or manual mode. Car had to be towed to dealer. This is a daily commuter car to work and home and I am working this week and has left me stranded during the holidays. No rentals available due to holidays. Complete transmission failure from a 2008 model with less than 100,000 and I put 12,000 on it since april when I bought it with 82,xxx.

Filed Apr 9, 2013 · Engine, Transmission · 113,000 miles · MO

Back in december 2012 my car have not been driving correctly. I took it to the behlmann gmc dealership and they stated everything was fine. In jan I took my car in for an oil change and informed them that my car had still not been driving correctly on that same visit I had them do a diagnostic and behlmann stated that the machine didn't say anything transmission wise that was wrong. Now that it is april my car is feeling like its getting worsier and worsier and I took it to autozone and also another car shop and had them put the car on the machine. Both places are saying the error is saying my transmission is slipping and my transmission fluid is burning. I am very disappointed because while my car was under warranty which expired not to long ago I was getting the run around saying that the transmission was fine when all along it was indeed damaging.

Filed Jun 7, 2012 · Transmission · 65,000 miles · VA

I drive a 2008 pontiac grand prix gxp and have had nothing but issues with the transmission.when coming to a complete stop and then trying to accelerate the car will struggle trying to go.then we will get a big jolt as the car slips into gear.we have almost got in an accident from this as we were turning into a store and all of a sudden the car will not go.as on coming traffic is coming we pursue to try to push a little harder on the gas pedal before finally getting a big jolt and the car gets into gear. We have took the car over 9 to 10 times to dealership and filed a complaint with gm.the dealership claims that they are having issues duplicating the issue.I don't know how when it happens more than often. Its getting pretty bad and soon I have a feeling it is going to go out. We were able to get are warranty on the car extended since we have been taking it to the dealership for this issue since around 60 k miles. We are going back this week to drop it off again.feels like a torque converter and they will not check any of the transmission parts. We have even requested to pay out of pocket to take a look at the transmission and take it apart to see if they can find issues.they have declined it as if they don't want anything to do with it.I did some research and this is what they claim the issue is "converter relief valve is the main culprit in the 4t65-hd (as used in the ls4 application) tcc failures.this valve bleeds off at too high a pressure,which damages the tcc over time" upon the dealerships request we have had are transmission flushed,fuel injectors clean and on the 8th time taking it there have found that two motor mounts were broken and they claim that this is what the issue was. $1,500 dollars later after the repair we are still having nothing but issues with the transmission.gm needs to do something to get this fixed before someone gets hurt or even killed.

Filed Mar 18, 2011 · Transmission · 62,051 miles · FL

2008 pontiac grand prix gxp v8 transmission failure. Car shudders, transmission slips, car shakes at all speeds. Dealer blamed it on tires, tires been replaced and balanced. Have balancing paper work to prove it.

Filed Mar 10, 2011 · Transmission · 61,000 miles · FL

2008 pontiac grand prix gxp. Slipping transmission, still under warranty, dealer says cannot replicate issue. Car vibrates horribly, slips into every gear. Dealer will not fix until transmission stops working all together. Car has been turned in for this issue 6 times. Gm needs to fix it!!!!!!!!!!!!!!!!!!!!!!