Thread: 2005 Grand Prix chugging

I have the same problem. I have a 2005 grand prix and will randomly have sluggish acceleration. The problem is temporarily fixed when I shut off the engine and restart it. Does anyone have a solution?

To Wolverines,

Yes, I am still trying to figure my 05 Grand Prix out. I originally posted this problem late last year, without any fix. I don't have a clue as too why the car is doing this. It appears that its a 2005 model issue! It's pissing me off too.......

Hey Wolverine.......

Just saw you were having the same issue that I have been having with the 05 Grand Prix. I recieved a fix from another memeber that I wanted to pass along to ya:
Old thread, but thought it worthy of an update.

From surferstick:

I had the stock PCM reflashed to the updated code mentioned in the TSB. It's now been months, and not a single problem since, so this fixed it for sure. Even better, the car now feels as strong as my old 99 did. I always felt I lost some power when I traded my 99 GT for this 05 GT, and now I've got my missing power back too.

Happy New Year folks.


I haven't gotten mine flashed yet, but will check into it.

Just wanted to pass this along to ya.

Later....... Steve!