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 LATCH SWITCHES MALFUNCTION)CIRCUIT/SYSTEM VERIFICATION
2011 GMC Yukon Base, 5.3 0, RWD
Circuit/System Verification
2011 GMC Yukon Base, 5.3 0, RWDSECTION Circuit/System Verification
- With the liftgate closed, observe the scan tool Liftgate Latch Pawl, Ratchet, and Sector Switch parameters. Each parameter status should be as listed below:
- LGM Latch Pawl Sw parameter - Inactive
- LGM Latch Ratchet Sw. parameter - Inactive
- Liftgate Latch Sector Switch parameter - Inactive
- With the liftgate open, observe the scan tool Liftgate Latch Pawl, Ratchet, and Sector Switch parameters. Each parameter status should be as listed below:
- LGM Latch Pawl Sw parameter - Active
- LGM Latch Ratchet Sw. parameter - Active
- LGM Latch Sector Sw. parameter - Inactive
- Sector Switch Test - Close the liftgate allowing the cinch motor to pull the liftgate closed. Observing the scan tool LGM Latch Sector Sw. parameter while the liftgate is being automatically cinched closed; the parameter should change from Inactive to Active then back to Inactive within 10 seconds.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.