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DTC codes / C05xx · Brakes, steering and suspension / C057E

C057EBrake Booster Temperature Sensor A/B Correlation

The C057E code indicates that the anti-lock brake system (ABS) control module has detected a correlation error between the brake booster temperature sensor's two internal sensing elements, which are designated as channels A and B. The module compares the voltage or resistance signals from both channels and sets this code when the difference exceeds a calibrated threshold for a specified time, signaling a potential sensor fault or wiring issue.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • Illumination of the ABS warning light on the instrument cluster.
  • Illumination of the traction control or stability control warning light.
  • Often no symptoms besides the warning light, with normal brake pedal feel and performance.
  • In rare cases, a slight reduction in brake assist effectiveness if the sensor fault affects booster operation.
  • Intermittent warning light activation, especially in cold or damp conditions.
  • Possible storage of related ABS codes or a pending code without a hard fault.

Common causes, most likely first

  1. Faulty brake booster temperature sensor with an internal correlation drift between channels A and B.
  2. Damaged or corroded wiring harness or connector at the brake booster temperature sensor.
  3. Poor electrical connection at the ABS control module connector affecting sensor signal integrity.
  4. Contamination or debris on the sensor element causing inconsistent temperature readings.
  5. Extreme temperature fluctuations or thermal cycling causing sensor element degradation.
  6. Software anomaly in the ABS control module requiring recalibration or update.
  7. Rarely, a malfunctioning ABS control module itself misinterpreting valid sensor signals.

How to diagnose and fix it

  1. Use a scan tool to retrieve all stored and pending codes, and record freeze-frame data for C057E to understand the conditions when it set.
  2. Visually inspect the brake booster temperature sensor, its connector, and the wiring harness for damage, corrosion, or loose pins.
  3. Measure the resistance or voltage output of both sensor channels with a multimeter and compare readings to specifications; a significant difference indicates a faulty sensor.
  4. Perform a wiggle test on the sensor wiring while monitoring live data to check for intermittent signal changes.
  5. If the sensor is faulty, replace it with a new unit and clear the codes to verify the repair.
  6. Check for technical service bulletins (TSBs) or software updates for the ABS control module that address sensor correlation issues.
  7. If the sensor and wiring are confirmed good, diagnose the ABS control module for internal faults or recalibration needs.

Sensor correlation faults often misdiagnosed

  • A correlation code between sensor channels does not always mean the sensor is defective; wiring resistance differences can skew one channel's reading and trigger the code.
  • The brake booster temperature sensor is sometimes integrated into the booster assembly, making replacement more involved than a standalone sensor swap.
  • Technicians often overlook the ABS control module connector, where a single bent pin can cause a correlation error without any visible sensor damage.
  • This code can be set by a temporary voltage drop during engine cranking, so checking for a weak battery or poor ground connections is worthwhile.
  • After replacing the sensor, some vehicles require a calibration or learn procedure for the ABS module to recognize the new sensor's signal range.

Can I keep driving with C057E?

The vehicle remains safe to drive under normal conditions because the brake system retains full hydraulic function, but you should avoid heavy braking or towing until the fault is repaired. If the warning light is accompanied by a noticeable change in brake pedal feel, have the vehicle inspected immediately.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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