ABS Module Lab
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C0278

ABS / stability-control fault code, listed for 11 vehicle lines from Toyota. What it means on each one, from published sources, and when the module is the cause.

What C0278 means

Is it the ABS module?

Check the cheap things first: battery voltage and the main fuses for the ABS pump and module, the ground straps, the module connector (corrosion, a pushed-back pin) and, for wheel-speed codes, the sensor and its wiring at each wheel. If those are good and the code returns as soon as it is cleared — or the scan tool cannot talk to the ABS module at all — the module itself is the likely cause, and that is what we repair.

Vehicles that set C0278

C0278 by vehicle

What does C0278 mean on a Toyota 4Runner (N280)?

On the 2010-2020 Toyota 4Runner (N280) it means: Open circuit in the ABS solenoid relay circuit (the relay that supplies power to the ABS solenoids); C0279 is a short in the same circuit. That vehicle uses Brake actuator assembly. We repair it as part of the Toyota / Lexus brake actuator (ABS / VSC) family, from $499.

What does C0278 mean on a Toyota Camry (XV30)?

On the 2002-2006 Toyota Camry (XV30) it means: Open circuit in the ABS solenoid relay circuit; the solenoid relay supplies power to each ABS solenoid and on the VSC-equipped XV30 Camry sits in the separate ABS relay block (ABS R/B).. That vehicle uses Brake actuator assembly ('ACTUATOR Assembly, Brake', W(ABS)). We repair it as part of the Toyota / Lexus brake actuator (ABS / VSC) family, from $499.

What does C0278 mean on a Toyota Camry (XV40, non-hybrid)?

On the 2007-2011 Toyota Camry (XV40, non-hybrid) it means: Open circuit in the ABS solenoid relay circuit (the relay that supplies power to the ABS solenoids); C0279 is a short in the same circuit. That vehicle uses Bosch ABS 8.1 (vehicles without VSC). We repair it as part of the Bosch ABS / ESP 8 family, from $499.

What does C0278 mean on a Toyota Camry (XV50, non-hybrid)?

On the 2012-2017 Toyota Camry (XV50, non-hybrid) it means: Open circuit in the ABS solenoid relay circuit (the relay that supplies power to the ABS solenoids); C0279 is a short in the same circuit. That vehicle uses Brake actuator assembly. We repair it as part of the Toyota / Lexus brake actuator (ABS / VSC) family, from $499.

What does C0278 mean on a Toyota Corolla (E140, US)?

On the 2009-2013 Toyota Corolla (E140, US) it means: Open circuit in the ABS solenoid relay circuit (the relay that supplies power to the ABS solenoids); C0279 is a short in the same circuit. That vehicle uses Brake actuator assembly. We repair it as part of the Toyota / Lexus brake actuator (ABS / VSC) family, from $499.

What does C0278 mean on a Toyota Corolla (E170, US)?

On the 2014-2019 Toyota Corolla (E170, US) it means: Open circuit in the ABS solenoid relay circuit (the relay that supplies power to the ABS solenoids); C0279 is a short in the same circuit. That vehicle uses Brake actuator assembly. We repair it as part of the Toyota / Lexus brake actuator (ABS / VSC) family, from $499.

Still not sure?

Send us C0278, a photo of the module label and your VIN — we tell you whether the module is the likely cause and what it costs, before you pull anything. Asking costs nothing.

Ask First — Send a Label PhotoStart My Repair — from $499

C0278 keeps coming back after the checks? Fix the module — from $499.

Look up your part number and order online — we email you a prepaid label to our lab. Or send us a photo of the label and your VIN first, and we'll tell you what you have and what it costs.

Back with your VIN and coding · can’t be repaired? repair price back, minus shipping · 1-year warranty · rush 2–3 days +$100

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Call (817) 505-4201 · 📱 Text us a photo of the module label · Confirm my module first — free · Email repairs@absmodulelab.com