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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Rear Drive Axle >> Diagnostic Information and Procedures >> DTC C039F: AWD Torque Signal >> Circuit/System Verification

Circuit/System Verification

NOTE:

The Q48 Rear Drive Clutch Solenoid Valve is calibrated with and is part of the K47 Rear Differential Clutch Control Module. Both components must be replaced as a matched set.

  1. Engine running and vehicle stationary.
  2. Verify the scan tool Rear Drive Clutch Status parameter is Temporarily Limited.
    • If not Temporarily Limited 
    1. Verify that DTC C0402, C0403, C0406, or C0407 is not set.
      • If none of the DTCs are set
    2. Verify there are no internal/external leaks or mechanical damage and that all differential fluid levels are at the proper levels. Refer to Rear Axle Lubricant Level Inspection , and Differential Clutch Oil Inspection .
    3. Clear DTCs and road test the vehicle.
    4. Verify that DTC C039F is not set.
      • If the DTC is set, replace the K47 Rear Differential Clutch Control Module.
      • If the DTC is not set
    5. All OK.
    • If Temporarily Limited 
  3. All OK.
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