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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 399 (POWER DOOR LOCK SYSTEM AND RELEASE SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER LIFTGATE MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Verification

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool LGM Disable Switch parameter while pressing and depressing the Liftgate Enable/Disable button on the interior liftgate control switch. The parameter should change from Inactive to Active.
    • If the value does not change, refer to Interior Liftgate Control Switch Inoperative below.
  2. Observe the scan tool LGM Front Control Switch parameter while pressing and releasing the liftgate button on the interior liftgate control switch. The parameter should change from Inactive and Active.
    • If the value does not change, refer to Interior Liftgate Control Switch Inoperative below.
  3. Observe the Liftgate Handle Sw. Status parameter while pressing and releasing the touchpad on the liftgate handle switch and the liftgate close switch next to the liftgate latch, the parameter should change from Inactive and Active.
    • If the value does not change, refer to Liftgate Handle Switch Inoperative below.
  4. Manually open the liftgate and verify that the liftgate will remain at or near the full open position for several minutes.
    • If the liftgate will not remain open, replace the liftgate struts.
  5. Command the LGM Open/Close Test with a scan tool. The liftgate should OPEN and CLOSE as commanded.
    • If the liftgate fails to OPEN and CLOSE, refer to Power Liftgate Inoperative below.
    • If the liftgate closes and immediately reopens, refer to Liftgate Closes and Reopens below.
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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.