GMC Troubleshooting Questions? Ask a Mechanic for Answers
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This can be due to a fault with the lift gate control motor itself or the linkage from the motor to the lift gate or more common an issue with one of the sensors that send a signal on what position the lift gate is at.If there is an issue with a sensor sending an incorrect/false signal this can cause a fault like this here in some cases.This will have to be checked over/inspected to pinpoint and repair the cause here.
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