C0278 LEXUS, TOYOTA, SCION: OPEN OR SHORT CIRCUIT IN ABS SOLENOID RELAY CIRCUIT
POST UPDATED IN February, 2023
C0278 LEXUS, TOYOTA, SCION: OPEN OR SHORT CIRCUIT IN ABS SOLENOID RELAY CIRCUIT
The ABS solenoid relay provides the power required by the ABS solenoid and the TRAC solenoid. Once the ignition switch is turned on, the car’s speed reaches 6 km/h. To determine if the solenoid is OK, an initial self-diagnostic is made, then the relay switches on. In case there is a fault in its circuit, the relay switches off.
The DTC C0278 OBDII code setting occurs when the supply voltage to the solenoid relay (+ BS) drops below the DTC detection level because the battery or alternator outputs are not as required.
The OBD2 fault code C0278 is stored due to the following reasons:
To troubleshoot the C0278 OBDII diagnostic code C0278, try this: