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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Automatic Transmission - 5ET50 (MKE)) >> Diagnostic Information and Procedures >> DTC P179D >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the Control Solenoid Valve Inspection  to verify Q8 Control Solenoid Valve Assembly condition.
  2. Perform the Control Solenoid Valve Performance Test  to verify Q8 Control Solenoid Valve Assembly function.
    • If a concern is found 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If no concern is found 
  3. Verify the a/trans fluid level control valve is not stuck, closed or in a damaged condition.
    • If you found a concern with the a/trans fluid level control valve 

      Replace the a/trans fluid level control valve.

    • Go to next step: If no concern is found 
  4. Verify the variable hi clutch and drive motor/generator stator cooling regulator boost valve is not sticking or damaged. Refer to Control Valve Body Diagnostic Inspection .
    • If you found a concern with the variable hi clutch and drive motor/generator stator cooling regulator boost valve 

      Repair or replace the valve or valve body.

    • Go to next step: If no concern is found 
  5. Verify the variable hi clutch assembly piston, snap ring, and clutch discs are not in a damaged condition.
    • If you found a variable hi clutch concern 

      Repair or replace the variable high clutch as necessary.

    • Go to next step: If no concern is found 
  6. All OK