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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2151 (POWER DOOR LOCK SYSTEM AND RELEASE SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESLIFTGATE SYSTEM DIAGNOSISCIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Circuit/System Verification

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the liftgate control module is programmed with the latest software.
    • If the software is not the latest, program the liftgate control module with the latest software. Refer to Control Module References for liftgate control module replacement, programming and setup.
  2. Verify the liftgate control module does not have any current DTCs set.
  3. Verify DTC B2494 or B153F is not set as a history DTC.
  4. Verify the scan tool LGM Disable Switch parameter changes from Inactive to Active pressing and depressing the liftgate Enable/Disable button on the interior liftgate control switch.
  5. Place the interior liftgate control switch to the Disable position.
  6. Verify the scan tool LGM Front Control Switch parameter changes between Inactive and Active while pressing and releasing the interior liftgate control switch.
  7. 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
    • LGM Latch Sector Sw. parameter - Inactive
  8. Observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate handle switch. The value should change between Active and Inactive as the switch is pressed and released.
  9. Using either the power door lock switches or the keyless entry transmitter, LOCK all doors then UNLOCK all doors. This will set the liftgate module door lock status to unlock.
  10. Verify the liftgate will manually open.
  11. With the liftgate open, verify the scan tool Object Detection Sensor Status parameter is 3-3.5 V.
  12. With the liftgate open, verify the scan tool Liftgate Latch Pawl, Ratchet, and Sector Switch parameters are as listed below:
    • LGM Latch Pawl Sw. parameter - Active
    • LGM Latch Ratchet Sw. parameter - Active
    • LGM Latch Sector Sw. parameter - Inactive
  13. Observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate close switch. The value should change between Active and Inactive as the switch is pressed and released.
  14. Observe the scan tool LGM Full Open Switch parameter while manually opening and closing the liftgate. The parameter should change between Active and Inactive as the liftgate opens and closes.
  15. Verify while manually opening and closing the liftgate is in proper aligned with the body bumpers, wedges and striker and there is no binding.
  16. Verify that the liftgate will remain at or near the full open position and does not drop down.
  17. Verify the scan tool LGM Latch Sector Sw. parameter changes from Inactive to Active then back to Inactive within 10 seconds while the liftgate is being automatically cinched closed.
  18. Liftgate open, select the Enable position on the interior liftgate control switch then activate the power close function. Verify the scan tool LGM Clutch Actuator Cmd. changes from Inactive to Active
  19. Activate the power close function of the liftgate.
  20. Liftgate closed, activate the power open function. Verify the liftgate power opens.
  21. Verify the liftgate has not been auto reversing un-expectedly.
    • If the liftgate has been auto reversing, check both liftgate object sensors for interference or deformity.
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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.