GMC Troubleshooting Questions? Ask a Mechanic for Answers
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Usually this is a fault with the head unit itself.Even if it was replaced it may be defective internally and needs replaced or removed and repaired again.I would have this tested further to see if it needs repaired or replaced and if it does I would see if the facility you had purchased it from will cover the costs for repair.
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