GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi there, I am Cam. Can I get your first name please?Most of your codes can be address by checking the oxygen sensor in the rear passengers side position. There is a bulletin that outlines a repair for chaffed wiring. IT is attached. in the first link. The second is a possible wiring issue at the ECM and is outlined in the second bulletin (link)and the last code is possibly just set because of the others. Lets address those and proceed from there.
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