Buick Repair Questions? Ask a Mechanic for Answers ASAP
Check pins 1-10-13-18 at the transmission connector. Its very possible these powers and grounds are messed up and causing all these transmission codes that you have. Below is a wire diagram.
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So even when attempting to drive it now with these issues no codes are being set?
Will your scan tool allow for monitoring the transmission range sensor/park neutral switch to see if its detecting the correct gear position you have selected?
The only thing I know left to do is pick some or one of the codes and do the diagnostic steps to resolve it and see how many codes that resolves. Will that help?
Sorry but I have nothing more to offer, would you like to try another tech