I have a 2005 Grand Prix over $100k miles, I’d have to look tomorrow to see what number exactly. I had an issue like I’ve read everyone else has, one days about 5 years ago the car started shifting hard, and just stopped completely, not able to reverse. Took it to a mechanics, each said needed a new tranny. So I had the tranny replaced, now this year, again started acting weird, bout 6 months ago, another mechanic said needs a new tranny. So frustrating, it’s not even worth the $ to get it fixed but it’s my sons primary vehicle to get to work. In between these years weird electrical issues, lights not working, no signals, dim to almost no lights from the stock radio. The front passenger window failed and motor wouldnt work so I bought a new motor and replaced it. Then the rear window started doing same I never fixed that one but basically don’t use that window. I didn’t buy this car directly, my brother bought it off dealership, and I took over the car cause he couldn’t pay it, and I finished paying off the loan years ago.
It was a nice car at first, drives nice, but the transmission issues, electrical issues, etc. have made it a nightmare, and I can’t afford to put that much more $$ into it. Probably have to sell it as is for parts and have no vehicle entirely. I had no idea about these forums until now, sounds like Pontiac is a lemon. I don’t think there are any options at this point where the manufacturer will do anything.