GMC Troubleshooting Questions? Ask a Mechanic for Answers
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Can you go into better detail on what concern you need help with?
Hello again Chris here,
Thanks for the extra info. The instrument cluster is going to be to blame for this concern.
The tests are to verify good power and ground to the cluster when the issue is occurring and use a scan tool to see if there are codes stored.
Each gets power and ground from the same source. If the rest of the cluster works then its getting power and ground.