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Home >> Chevrolet >> 2018 >> Volt Premier >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> DTC P05FF >> Circuit/System Verification
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Verification

  1. Verify no other DTCs are set.
    • Go to next step: If no DTCs are set 
    2. NOTE:

    To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur; the brake controller must see 1 pedal apply with the propulsion system enabled, followed by a proper shutdown without applying the brake pedal.

  2. Vehicle ON, apply and release the brake pedal.
    3. NOTE:

    Vehicle OFF, without applying the brake pedal ensure the brake modulator and high pressure accumulator pressure relief occurs. This process will take approximately 1-3 minutes.

  3. Vehicle OFF, without applying the brake pedal.
  4. Remove the remote keyless entry transmitter and close all of the vehicle doors. Wait approximately 1-3 minutes until the brake modulator and the high pressure accumulator pressure relief is complete and the vehicle powers down.
  5. Vehicle in Service Mode.
  6. Verify the scan tool parameters listed below are within 0 - 2 mm of each other as the brake pedal is applied:
    • Input Rod Position Sensor.
    • Output Rod Position Sensor.
    • Brake Pedal Position Calculated from Input Rod Position Sensor 1.
    • Brake Pedal Position Calculated from Input Rod Position Sensor 2.
    • If the parameters are not within the specified range 

      Replace the K177 Brake Booster Control Module.

    • Go to next step: If the parameters are within the specified range 
  7. Inspect for binding brake pedal, correct mounting of the K177 Brake Booster Control Module, or for brake fluid leaks.
    • Were any of the above conditions found 

      Repair as necessary.

    • Go to next step: If no conditions were found 
  8. Perform a brake hydraulic system test, refer to Hydraulic Brake System Diagnosis .
    • If the brake hydraulic system test does not pass 

      Repair as necessary.

    • Go to next step: If the brake hydraulic system tests normal 
  9. Replace the K177 Brake Booster Control Module.
  10. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
    • If the DTC sets 

      Replace the K17 Electronic Brake Control Module.

    • Go to next step: If the DTC does not set 
  11. All OK.
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