Some GMC Terrain owners report experiencing intermittent issues where the vehicle does not move forward from reverse, which can sometimes be resolved by restarting the vehicle. This problem may be related to the transmission or the shift lock control ECU/solenoid. Additionally, some owners have identified a potential cause as a non-functioning pressure control solenoid located within the control solenoid valve assembly. If restarting the vehicle does not rectify the issue, it is recommended to have the vehicle inspected by a professional to diagnose and address any underlying transmission or sensor problems.
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