Faulty brake booster temperature sensor B, such as an open or shorted internal element.; Damaged, chafed, or corroded wiring in the sensor circuit, including the signal, ground, or reference voltage wires.; Loose or contaminated electrical connector at the sensor or at the ABS control module.; Failed ABS control module, though this is less common and should be diagnosed last.; Extreme overheating of the brake booster from prolonged heavy braking, which can temporarily push the sensor signal out of range.; Aftermarket or incorrect sensor installed previously that does not meet the original equipment specifications.

DTC codes / C05xx · Brakes, steering and suspension / C057C

C057CBrake Booster Temperature Sensor B Circuit Range/Performance

C057C indicates that the brake booster temperature sensor B circuit is reporting a voltage or signal that falls outside the expected range for the current operating conditions, or that the signal is not performing as designed. The anti-lock brake system (ABS) control module monitors this sensor to protect the brake booster from overheating and sets the code when the signal is implausible or erratic.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

Illumination of the ABS warning light, brake system warning light, or both on the dashboard.
Often no symptoms besides the warning light, with normal brake pedal feel and braking performance.
Reduced or disabled ABS function, which may only be noticed during hard braking or slippery conditions.
In some vehicles, a message on the driver information center indicating a brake system fault or service required.
Intermittent warning light operation if the sensor signal is erratic due to a loose connection or heat-related issue.

Common causes, most likely first

Faulty brake booster temperature sensor B, such as an open or shorted internal element.
Damaged, chafed, or corroded wiring in the sensor circuit, including the signal, ground, or reference voltage wires.
Loose or contaminated electrical connector at the sensor or at the ABS control module.
Failed ABS control module, though this is less common and should be diagnosed last.
Extreme overheating of the brake booster from prolonged heavy braking, which can temporarily push the sensor signal out of range.
Aftermarket or incorrect sensor installed previously that does not meet the original equipment specifications.

How to diagnose and fix it

Verify the code with a scan tool that can read ABS module data and check for any related pending or history codes.
Inspect the brake booster temperature sensor B and its connector for physical damage, corrosion, or loose pins.
Perform a visual inspection of the wiring harness from the sensor to the ABS module, looking for chafing, burns, or pinched sections.
Measure the sensor resistance and compare it to the manufacturer's specification, and check the reference voltage and ground at the sensor connector.
If the sensor tests out of specification, replace it with a quality original equipment or equivalent part.
Clear the codes and perform a road test to confirm the repair, ensuring the warning light stays off and the monitor runs to completion.
If the code persists after sensor and wiring repairs, follow the manufacturer's diagnostic flow for the ABS module, which may include module replacement.

What the brake booster sensor code hides

A brake booster temperature sensor B circuit range/performance code often sets intermittently due to heat soak after the engine is shut off, so the fault may not be present during a cold inspection.
Technicians sometimes replace the sensor only to find the real problem is a chafed wire near the exhaust or a corroded ground that shifts resistance as temperatures change.
This code does not always mean the sensor has failed; a weak battery or charging system issue can cause the ABS module to misread sensor signals and set false range codes.
On some vehicles, the brake booster temperature sensor is part of a combined sensor assembly, so diagnosing individual circuit faults requires checking the entire assembly and its shared connector.
A sticking brake caliper or dragging brake can overheat the booster and trigger this code, so always check for brake drag and uneven pad wear before condemning the sensor.

Can I keep driving with C057C?

The vehicle remains safe to drive under normal conditions because the base brakes are unaffected, but the ABS may be disabled, so avoid hard braking or slippery roads until the fault is repaired. If the brake pedal feel changes or the warning light is accompanied by a red brake warning, stop driving and have the system inspected immediately.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.