C05B5 — Brake Booster Temperature Sensor C Circuit/Open

What Does C05B5 Mean?

C05B5 is a diagnostic trouble code indicating: Brake Booster Temperature Sensor C Circuit/Open. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C05B5

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Brake Booster Temperature Sensor C readings
⚠️ Related system operating intermittently
⚠️ ABS or stability control warning light

Common Causes

🔍 Wiring issue in Brake Booster Temperature Sensor C circuit (damaged, chafed, or corroded)
🔍 Faulty Brake Booster Temperature Sensor C connector or terminal
🔍 Failed Brake Booster Temperature Sensor C
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does C05B5 mean?

C05B5 indicates: Brake Booster Temperature Sensor C Circuit/Open. The vehicle's computer has detected that the Brake Booster Temperature Sensor C is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C05B5?

Only short distances if absolutely necessary. C05B5 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C05B5?

Repair costs for C05B5 typically range from $100 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 C wiring and connectors
🔧 Replace faulty Brake Booster Temperature Sensor C

1
Find your vehicle above
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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.

C05B5: Brake Booster Temperature Sensor C Circuit/Open