OBDII Code List

C0278 TOYOTA - Open or Short Circuit in ABS Solenoid Relay Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Blown Anti-Lock Brake System (ABS) Solenoid Relay Fuse
  • Faulty ABS Solenoid Relay
  • ABS Solenoid Relay harness is open or shorted
  • ABS Solenoid Relay circuit poor electrical connection
  • ABS Actuator (Skid Control ECU)

Possible symptoms

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

C0278 Toyota Description

The solenoid relay supplies power to the Anti-Lock Brake System (ABS) solenoid and TRAC solenoid.

After the ignition switch is turned on, the vehicle speed has reached 4 mph (6 km/h) and the solenoid is determined to be normal by the initial check self- diagnosis, the relay switches on. If any open or short circuits are detected, the relay switches off.

These DTCs may be set if the voltage supply to the solenoid relay (+BS) falls below the DTC detection threshold due to the battery or generator outputs being insufficient.

OBDII Code C0278 Toyota - Open or Short Circuit in ABS Solenoid Relay Circuit -

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C0278 TOYOTA Comments

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