GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is***** is your vin number? Are you sure that is the code you are getting? Can you check again? Thanks.
Ok, it is probably P0122. The common things to cause this code is TPS and TPS connector so I'd start by checking resistance on wiring between TPS and PCM. If any of the wires have over 5 ohms resistance then check for problems or run new wires. Here is a wiring diagram to help with testing, let me know if you run into questions. Thanks.