C057A — Brake Booster Temperature Sensor B Circuit High

What Does C057A Mean?

C057A is a diagnostic trouble code indicating: Brake Booster Temperature Sensor B Circuit High. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C057A

⚠️ Check Engine Light (MIL) illuminated
⚠️ Brake Booster Temperature Sensor B reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ ABS or stability control warning light

Common Causes

🔍 Short to voltage in Brake Booster Temperature Sensor B wiring harness
🔍 Corroded or water-damaged Brake Booster Temperature Sensor B connector
🔍 Faulty Brake Booster Temperature Sensor B outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does C057A mean?

C057A indicates: Brake Booster Temperature Sensor B Circuit High. The vehicle's computer has detected that the Brake Booster Temperature Sensor B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C057A?

Only short distances if absolutely necessary. C057A affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C057A?

Repair costs for C057A typically range from $20 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Brake Booster Temperature Sensor B wiring for short to voltage
🔧 Clean or replace corroded Brake Booster Temperature Sensor B connector
🔧 Replace faulty Brake Booster Temperature Sensor B

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

C057A: Brake Booster Temperature Sensor B Circuit High