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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 C0321 Or C0326: Range Actuator Lock Control >> 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 of the following scan tool parameters display OK.
    • Range Actuator Lock Control Circuit High Voltage Test Status
    • Range Actuator Lock Control Circuit Low Voltage Test Status
    • Range Actuator Lock Control Circuit Open Test Status
    • If any of the parameters do NOT display OK 

      Refer to Circuit/System Testing below.

    • Go to next step: If all of the parameters display OK 
  2. Using the transfer case Range Actuator Lock function of the Control Functions feature of the scan tool, command the transfer case range actuator lock ON and OFF. You should be able to hear the range actuator lock engage and disengage.
    • If you are unable to hear the range actuator lock engaging and disengaging 

      Refer to Circuit/System Testing below.

    • Go to next step: If you are able to hear the range actuator lock engaging and disengaging 
  3. Verify DTC P0321 or P0326 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 A16 transfer case motor 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 P0321 or P0326 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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