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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC C0392, P0642 Or P0643: Transfer Case Range Position Sensor Circuit/5V Reference >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that all range selections of the S77 transfer case shift control switch match the following parameters in the Data Display feature of the scan tool:
    • Range Actuator Position
    • Transfer Case Commanded Position
    • Transfer Case Range
    • If NOT all of the parameters match the S77 transfer case shift control switch position 

      Refer to Circuit/System Testing below.

    • Go to next step: If ALL of the parameters match the S77 transfer case shift control switch position 
  2. Verify that for all range selections of the S77 transfer case shift control switch, the Transfer Case Range Position Sensor parameter and the Range Actuator Position Sensor parameter track within 5 degrees of each other.
    • If the parameters do NOT track within 5 degrees of each other 

      Refer to Circuit/System Testing below.

    • Go to next step: If the parameters DO track within 5 degrees of each other 
  3. Verify DTC C0392, P0642 or P0643 is only set as a history DTC.
    • If any of the DTCs are set as current 

      Refer to Circuit/System Testing below.

    • Go to next step: If any of the DTCs are only set as history 
  4. Visually inspect each connector terminal of the K69 transfer case control module X1 connector and the B227 gear position sensor connector for damage or corrosion. Repair as necessary.
    NOTE: After inspection, apply Nyogel lubricant 760G to each connector terminal. Ensure each connector and CPA is correctly seated.
  5. Clear DTC C0392, P0642 or P0643 from history.
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. The DTC should not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing below.

    • Go to next step: If none of the DTCs set 
  7. All OK.
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