Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2011YUKON BASE, 5.3 0, RWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSPOWER DOOR LOCK SYSTEM AND RELEASE SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESPOWER LIFTGATE MALFUNCTION (LIFTGATE FULL OPEN SWITCH MALFUNCTION)CIRCUIT/SYSTEM TESTING
2011 GMC Yukon Base, 5.3 0, RWD
Circuit/System Testing
2011 GMC Yukon Base, 5.3 0, RWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the liftgate actuator switch.
- Test for less than 10 Ξ© between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the liftgate control module.
- Ignition ON, verify that the scan tool LGM Full Open Switch parameter is Inactive.
- If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the liftgate control module
- Connect a 3A fused jumper wire between the signal circuit terminal 1 and ground, verify that the scan tool LGM Full Open Switch parameter is Active
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the liftgate control module
- If all circuits test normal, replace the liftgate actuator switch.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.