C1178 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1178 – ABS Active Brake Booster


C1178 Possible Symptoms


Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)


C1178 Possible Causes


Faulty Brakes Booster,Faulty ABS Control Unit/Actuator,ABS Control Unit/Actuator harness is open or shorted,ABS Control Unit/Actuator circuit poor electrical connection


C1178 Description


The active brake booster consists of vacuum booster, an active booster control group and a delta stroke sensor. In case of brake booster system malfunction due to loss of vacuum the delta stroke sensor will signal the ABS actuator and electric unit (control unit) that a booster failure has occurred. The active booster then applies supplemental force to the master cylinder relative to the amount of force exerted on the brake pedal.