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Home >> Chevrolet >> 2014 >> Volt >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Information and Procedures >> DTC C0299 or C12FF: Brake Control Module/Brake Booster >> Circuit/System Verification
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Circuit/System Verification

NOTE: The 12 V battery must be able to maintain a charge during this brake sensor performance procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.
  1. Vehicle in Service Mode with the transmission in PARK.
  2. Perform the Electronic Brake Control Module Learn procedure with a scan tool.
    NOTE: Do not depress the brake pedal during the Electronic Brake Control Module Learn.
  3. Vehicle ON, apply and release the brake pedal.
    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.
  4. Vehicle OFF, without applying the brake pedal.
    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.
  5. 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.
  6. Vehicle in Service Mode, brakes not applied.
  7. Verify the scan tool parameters listed below are within the specified range:
    • Brake Controls Brake Pedal Position Sensor 5 V Supply Voltage - Between 4.75-5.25 V.
    • Brake Controls Brake Pedal Position Sensor Circuit 1 - Between 1.4-1.7 V
    • Brake Controls Brake Pedal Position Sensor Circuit 2 - Between 58-78%
    • If all parameters are within the specified range 
  8. Verify the scan tool parameters listed below are less the specified range:
    • Brake Master Cylinder Pressure Sensor - Less than 100 kPa (15 psi)
    • Brake Pressure Sensor - Less than 100 kPa (15 psi)
    • High Pressure Accumulator Sensor - Less than 800 kPa (116 psi)
    • If any parameter is greater than the specified range 

      Replace the Q5 Brake Pressure Modulator.

    • If all parameters are less than the specified range 
  9. Perform a brake hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis .
    • If the brake hydraulic system test does not pass 

      Repair or replace the applicable component.

    • If all parameters are less than the specified range 
  10. Replace the Q5 Brake Pressure Modulator.
  11. 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.

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