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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 119 (DOOR LOCK SYSTEMS & DOOR HANDLES)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 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 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 I/P switch assembly. The parameter should change from Inactive to Active.
    • If the parameter does not change, refer to I/P Switch Inoperative below.
  2. Observe the scan tool LGM Front Control Switch parameter while pressing and releasing the liftgate button on the I/P switch assembly. The parameter should change from Inactive and Active.
    • If the parameter does not change, refer to I/P Switch Inoperative below.
  3. Observe the Liftgate Handle Sw. Status parameter while pressing and releasing the touchpad on the liftgate handle and the liftgate button next to the liftgate latch, the parameter should change from Inactive and Active.
    • If the parameter does not change, refer to Liftgate Handle Switch Inoperative below.
  4. Disable the power liftgate by pressing the Liftgate Enable/Disable button on the I/P switch assembly and manually open and close the liftgate. The liftgate should release, open and close manually, cinch-in and latch.
    • If the liftgate fails to release, cinch-in or latch, refer to Latch Assembly Malfunction below.
  5. 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.
  6. Command the liftgate to OPEN and CLOSE 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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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.