This story is not over yet.
After replacing the TPS the car ran great for about a week then the erratic shifting again. Mother flucker..son of a biache.,,,,grrr...
I decided to replace the PCM. Found a stock 03 GT PCM that ZZP had updated with the latest from GM for cheap.
Car fired right up after install. Did the quick 10 sec on 3 sec off key learn I found on this forum. Thanks to Scottydog I think it was, who posted on it.
Running very well but....the damn Trac Off light is on all the time now. Pushing the button does nothing.
A mechanic at work let me use his SnapOn scanner. Came up with one code: P1670 that wouldn't clear. PCM not communicating with the EBCM. No ABS light or CEL either.
No erratic shifting issues at all but no TC. I swapped my old PCM back in and TC was as it should be. Swapped back to the ZZP TC off light always on
A replacement PCM from ZZP is on the way and will be here tomorrow.
Ready to do a trans fluid & filter and a TransGo kit this weekend as well.
A big Thanks goes out to member rottonj for his help and guidance over the last couple of weeks....Much appreciated.
