Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question.
I know you have checked for recalls, but I would like to check for service bulletins, which are a bit different than recalls. I just need the vin number. Based upon my experience and symptoms, I suspect the IP Cluster or a loose body ground behind the dash.
Ok, bunches of service bulletins on electrical failures regarding the ip cluster, radio and other systems. I believe we need to start with check the wiring harness near the parking brake. I have uploaded the bulletin that has excellent photos of the harness you need to check and how to repair. If this checks out fine, we will go from there.
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hmmm, guess it didnt upload. let me try again - ok, should be attached at bottom of this answer - click on it to open and then download and/or print
Ok, at the BCM(see attached diagram), located behind driver side of the dash, as well as at the IP Cluster, remove the harness connectors to them and on the harness side connectors, inspect them for tiny black specks. This is known as fretting corrosion. If you find it, use some emory cloth to clean it off, then apply a small amount of dielectric grease to the connectors and reinstall. This is a well known issue in the mid 2000s GM trucks and suvs.
The tiny black specks, fretting corrosion is the well known issue
The only other things are to test the IP Cluster and BCM for correct operation.
You are welcome and always happy to help