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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Transfer Case - BW 4474) >> Diagnostic Information and Procedures >> DTC C0399: Transfer Case Clutch Control >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, engine OFF.
  2. Verify DTC C0399 is only set as a history DTC.
    • If the DTC is set as current 

      Refer to Circuit/System Testing.

    • If the DTC is set as history 
    3. NOTE:

    After inspection, apply Nyogel lubricant 760G to each connector terminal. Ensure each connector and CPA is correctly seated.

  3. Visually inspect each connector terminal of the K69 Transfer Case Control Module connector for damage or corrosion.
    • If damage or corrosion exists 

      Repair as necessary.

    • If damage or corrosion does not exist 
  4. 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 the DTC sets 

      Refer to Circuit/System Testing.

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