GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello both of the seats have a seat belt tensioner. Did you reconnect both of them?
You need to reset the system. Make sure they are both plugged in all the way. Than disconnect both of the battery cables, wait 5 minutes and touch the cables together before reconnecting. Than reconnect. The system is putting up the codes because of the tensioners and needs to be reset as long as they are all the way plugged in this will take care of the problem. Let me know how it goes, thanks.