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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 C0407: AWD Oil Pump Motor >> Circuit/System Verification

Circuit/System Verification

  1. Verify that DTC C0407 with symptom byte 02, 04 or 0B is not set.
    • If DTC is set 

      Refer to Circuit/System Testing.

    • If DTC is not set 
  2. Verify the rear axle fluid level is correct. Refer to Rear Axle Lubricant Level Inspection .
    • If the rear axle fluid is below specifications 

      Inspect for fluid leaks and fill as required.

    • If the rear axle fluid is above specifications 
    1. Verify the differential clutch fluid level is correct. Refer to Differential Clutch Oil Inspection .
      • If the differential clutch fluid is below specifications, replace the limited slip differential clutch.
      • If the differential clutch fluid is above specifications, lower the rear differential clutch fluid to the correct level.
      • If the differential clutch fluid level is correct.
    2. Lower the rear axle fluid to the correct level.
    • If the rear axle lubricant level is correct 
    3. NOTE:

    The differential clutch assembly must be over filled then lowered to the correct level in order to get a proper fluid level fill and reading.

  3. Verify the differential clutch fluid level is correct. Refer to Differential Clutch Oil Inspection .
    • If the differential clutch fluid is above specifications 

      Lower the differential clutch fluid to the correct level.

    • If the differential clutch lubricant level is correct 
  4. Verify that DTC C0407 with symptom byte 64 is not set as current.
    • If DTC C0407 with symptom byte 64 is set as current and the differential clutch fluid level is correct 

      Refer to Circuit/System Testing.

    • If DTC C0407 with symptom byte 64 is not set 
  5. Verify the Rear Differential Clutch Pump Motor Current parameter is between 2.5-3.5A when commanding the Rear Differential Clutch Pump Motor ON with the scan tool
    • If not between 2.5-3.5A 
    1. Verify there are no system leaks while under pump pressure.
      • If the system is leaking, repair as necessary.
      • If the system is not leaking, replace the M32 Differential Clutch Pump.
    • If between 2.5-3.5A 
  6. All OK.
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