C0571

Active Brake Assist Performance

Moderate severity

The brake assist or driver assistance module has detected that brake assist performance is degraded. The system may fail to autonomously build pressure during emergency braking and emergency brake assist functions are limited.

Common causes

Active booster slow or weak
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $220-2750
Secondary fault on related sensor
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $220-2750
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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 C0571 mean?

C0571 means "Active Brake Assist Performance". It is a generic OBD-II code that points to a fault in the chassis.

What are the most common causes of C0571?

active booster slow or weak; secondary fault on related sensor; system calibration required after repair — 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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