GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello my name is Bob.
I looked at the schematic the only connector to disable the switch ( If that is the problem?)
It plugs into all the switches in the center of the dash.
It is called Shift Select Switch Performance Signal light blue/ gray wire
No problem I will put in for a refund.
Sorry couldn't help.
Need to take it to the dealer