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Home >> Cadillac >> 2017 >> Escalade ESV Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2771: Four Wheel Drive (4WD) Switch Circuit (NQF, NQH) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, 2017 Chevrolet Suburban 3500 HD, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, transmission in Neutral, place the transfer case shift control switch in the 2 HI position.
  2. Verify the 2 high indicator light on the switch is ON and not flashing.
    • If the 2 high indicator light is flashing or is not ON 

      Refer to Circuit/System Testing.

    • If 2 high indicator light is ON and not flashing 
  3. Verify the scan tool TCM 4WD Low parameter displays Disabled.
    • If Disabled is not displayed 

      Refer to Circuit/System Testing.

    • If Disabled is displayed 
  4. Place the transfer case shift control switch in the 4 Low position.
  5. Verify the 4WD low indicator light is ON and not flashing.
    • If the 4WD low indicator light is flashing or is not ON 

      Refer to Circuit/System Testing.

    • If the 4WD low indicator light is ON and not flashing 
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  7. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  8. All OK.
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