GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Disconnect both battery cables from the battery. Hold the positive and negative cables together for a few minutes. Then reconnect. That should reset the gate. You may have a sensor problem and would need a GM scan tool to view codes and data in the liftgate control module.
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You will need to go to the dealer to get it scanned for codes. This is the only way to see what is wrong. I am not from that area of the country so I am unsure of any dealers in that area, but any GM dealer should be fine.
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