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.
2008 Pontiac Grand Prix transmission complaints
Page 2 of 2: complaints 11 to 18 of 18, newest first, as owners wrote them.
Transmission failed without notice. Does not move when in drive, 1st, 2nd, or 3rd. However reverse works fine.
Delayed engagement from a dead stop, engine revved, car didn't move and then slammed into first gear. Since original date, it does it sporadically as well as slips in other gears. Preparing to take to dealer but from reading online, it's obvious there is a known defect in these transmissions.
I have two issues with my transmission. My vehicle only has 39,000 miles. Rev-and-clunk starts and not starting off from a stop. This is happening more frequently as the miles rack up. I have a 2008 pontiac grand prix gxp.
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.
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!!!!!!!!!!!!!!!!!!!!!!
After coming to a complete stop then accelerating the transmission has a 'shudder'. Occurs a few times a month. Nothing had been done to fix the problem. Car only has 36,300 miles on it. Original transmission fluid as well.
Car doesnt roll from a dead stop.
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