GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Sorry I do not work the morning shift, which is why I have not responded yet.
Do you have access to a scan tool that can perform the key reprogramming to see if this resolves the lock light coming on?
Will that same scan tool access the BCM to see if its getting the input from the brake switch when you want to shift from park?
Super, let me know those results then.
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Thanks for coming back, any luck on seeing if the BCM is getting a brake signal input?
Lets go after the easiest of these current issues the radio to see why it fails once started. Hopefully that diag and repair address most or all of the issues. Do you know how to remove the radio and do you have something to test 12 volt circuits?
So once started the radio fuse no longer has power?
Open the link below.