C0279

Brake Booster Boost Sensor Circuit Malfunction

Moderate severity

The brake control module has detected an electrical fault in the booster boost (assist pressure) sensor circuit. Power-assist regulation may default to a backup strategy.

Common causes

Boost sensor failed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $170-770
Sensor wiring or connector fault
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $170-770
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does C0279 mean?

C0279 means "Brake Booster Boost Sensor Circuit Malfunction". It is a generic OBD-II code that points to a fault in the chassis.

What are the most common causes of C0279?

boost sensor failed; sensor wiring or connector fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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