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AutoCodes - Generic - C0278

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

- Code Popularity: 19,454 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC C0278?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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)
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How to Fix the DTC C0278?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0278 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

When solenoid relay is turned on, relay contact is off for 0.2 seconds or longer.

What are Code Possible Symptoms?

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

Code C0278 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 - Open or Short Circuit in ABS Solenoid Relay Circuit - AutoCodes.com
C0278 Code - Open or Short Circuit in ABS Solenoid Relay Circuit

Need More Information on the Code?

Need more information on how to fix the C0278 code? Get Access to Factory Service Manuals

Information for Specific Makes

  • C0278 Lexus Open or Short Circuit in ABS Solenoid Relay Circuit
  • C0278 Scion Open or Short Circuit in ABS Solenoid Relay Circuit
  • C0278 Toyota Open or Short Circuit in ABS Solenoid Relay Circuit

Need Help with the Code?

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Code C0278 comments

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