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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 C0306 Or C0381: Range Actuator Control Circuit >> 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 DTC C0321 in NOT set.
    • Go to next step: If DTC C0321 is NOT set 
  2. Verify that all of the following scan tool parameters display OK.
    • Range Actuator Control Circuit High Voltage Test Status
    • Range Actuator Control Circuit Low Voltage Test Status
    • Range Actuator Control Circuit Open Voltage Test Status
    • Range Actuator Control Circuit Shorted Test Status
    • If any of the parameters do NOT display OK 

      Refer to Circuit/System Testing.

    • Go to next step: If all of the parameters display OK 
  3. Verify that for all range selections of the S77 transfer case shift control switch, the Range Actuator Current parameter increases or decreases during the shift and then returns to 0.0 A after shifting.
    • If the Range Actuator Current parameter does NOT perform as described 

      Refer to Circuit/System Testing.

    • Go to next step: If the Range Actuator Current parameter DOES perform as described 
  4. Verify DTC C0306 or C0381 is only set as a history DTC.
    • If C0306 or C0381 is set as current 

      Refer to Circuit/System Testing.

    • Go to next step: If C0306 or C0381 is only set as history 
  5. Visually inspect each connector terminal of the K69 transfer case control module X3 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.
  6. Clear DTC C0306 or C0381 from history.
  7. 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 DTC C0306 or C0381 sets 

      Refer to Circuit/System Testing below.

    • Go to next step: If DTC C0306 or C0381 does not set 
  8. All OK.
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