bigalnash

2008 grand prix gxp 28k. about a week ago my car went into limp home mode aka service traction control light and reduced engine power. take it into the dealer the maf sensor was bad so they had to order another one . 5 days after the car is fixed it goes into limp home mode again. heres the kicker the first time it did that was about 20 miles after a full tank of gas. the second time about 20 miles after i put a full tank in. also after sitting overnight the car is driveable again but now its just the engine light on. anyone have any suggestions or experienced this before?

Swift_01_z-28

iTrader: (1)

Sounds to me like you may have a short somewhere. I have an 07 g5 that would do the same thing and is still doing it. I am sure the maf is bad, but it has been doing this since about 6 months after I got it. I bought it brand new. You may want to have someone break into your computer and give it a look around.

Swift_01_z-28

iTrader: (1)

BTW, do you have any aftermarket stuff done to it?

Mels SS

iTrader: (1)

Do all the LS4 have this mode that shuts down when something goes wrong

bigalnash

no aftermarket or anything, i just dropped it off at the dealer today, funny thing when i start it up this morning the engine light wasnt on anymore, but the guy said since it was on it stores the code or some ****. i just had the maf sensor replaced 5 days ago. you think the new one they ordered may have been bad?

EmersonHart13

iTrader: (3)

Bad battery? Have them clean the TB and flash the computer with the most recent updates. That is what fixed my problem and it sound similar to yours.

bigalnash

well i just got word from them said it was the maf sensor again, so they called gm and said there are cases of the accelerator peddle afecting the maf sensor , so i guess their gonna replace the pedal? lol we'll see if that works or not.

Swift_01_z-28

iTrader: (1)

If it were me, I would replace the maf with an aftermarket one if you can find one. Mine went out on the g5. Damn new pontiacs messin up.