Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with a sensor that checks the temperature of the brake booster. It's like a thermometer for the brakes, and it's saying the temperature is too high.
The Brake Booster Temperature Sensor B is reporting a voltage that is higher than expected, indicating a possible fault in the sensor or its circuit.
The C057A code is triggered when the Brake Booster Temperature Sensor B circuit sends a voltage signal to the Engine Control Module (ECM) that is higher than the specified range. This could be due to a faulty sensor, wiring issues, or a malfunction in the ECM.
• Illuminated check engine light
• Reduced braking performance
• Unusual brake pedal feel
• Faulty brake booster temperature sensor
• Wiring issues such as shorts or open circuits
• Malfunctioning ECM
ECM: Engine Control Module, the computer that manages the engine's operations.
Brake Booster: A device that uses vacuum to amplify the force applied to the brake pedal.
• Use an OBD-II scanner to confirm the code.
• Inspect the brake booster temperature sensor and its wiring for damage.
• Test the sensor's voltage output with a multimeter.
• Replace the brake booster temperature sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $400
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance checks of the brake system
• Ensure wiring and connectors are secure and undamaged
• Use quality replacement parts
Sensor Issue
• Do not ignore the check engine light.
• Have your brakes inspected by a professional.
• Avoid driving in harsh conditions until repaired.
Check with the vehicle manufacturer for specific warranty coverage related to brake system components.
This code has been reported in vehicles with advanced brake systems that monitor temperature for optimal performance.
Moderate – While the vehicle may still be drivable, braking performance could be compromised.
Driving with compromised brakes can be dangerous. Ensure repairs are made promptly to maintain vehicle safety.
• Vehicle ignition on, engine off
• Brake system at operating temperature
The brake booster temperature sensor is typically located near the brake booster assembly, often mounted on or near the firewall in the engine bay.
Q: Can I drive with a C057A code?
A: It's not recommended as it may affect braking performance. Have it checked as soon as possible.
Q: How can I reset the check engine light after fixing the issue?
A: Use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes to reset the system.
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