GMC Troubleshooting Questions? Ask a Mechanic for Answers
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These light come on when the system sees a fault and there are many things that can cause this problem. Unfortunately in order to know what is failing you are going to need to start with having your shop scan the system and retrieve the fault code and or codes. If you can get the code and or codes for me I can then advise you on what is failing and causing the lights to come on.