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Home >> Chevrolet >> 2018 >> Volt Premier >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Diagnostic Information and Procedures >> DTC P0642, P06A6, or P06A7 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B201 Brake Control Brake Pedal Position Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Ignition ON/Vehicle in Service Mode.
  3. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than 4.8 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K177 Brake Booster Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K177 Brake Booster Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K177 Brake Booster Control Module, Ignition ON/Vehicle in Service Mode.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K177 Brake Booster Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  4. Replace the K177 Brake Booster Control Module.
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