C0278 OBD Code Definition:
C0278 Open or Short Circuit in ABS Solenoid Relay Circuit
C0278 OBD Code Description:

Possible causes
– Brake actuator (skid control ECU)
– ABS solenoid relay circuit
When is the obd code mean?
When solenoid relay is turned on, relay contact is off for 0.2 seconds or longer.
– ABS Warning Light ON

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