Ford C0278 OBD-II Trouble Code Definition: C0278 Open or Short Circuit in ABS Solenoid Relay Circuit C0278 Ford OBD-II Trouble CodeDescription: 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. Symptoms – ABS […]