GMC Troubleshooting Questions? Ask a Mechanic for Answers
This is a very simple flow chart. If you have that code, replace the VCM.
Replace the VCM even if this DTC exists only in history.
VCM must be programmed when it's installed, typically your dealer must do this, but there are various companies that will sell you a preprogrammed VCM (ECM, PCM, these terms are synonymous).