C05BB — Brake Booster Motor A Position Sensor Supply Circuit Range/Performance

What Does C05BB Mean?

C05BB is a diagnostic trouble code indicating: Brake Booster Motor A Position Sensor Supply Circuit Range/Performance. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C05BB

⚠️ Check Engine Light (MIL) illuminated
⚠️ Brake Booster Motor A Position Sensor Supply not operating within expected parameters
⚠️ Reduced efficiency or performance of related system
⚠️ ABS or stability control warning light

Common Causes

🔍 Brake Booster Motor A Position Sensor Supply degraded or contaminated
🔍 Mechanical wear or binding in Brake Booster Motor A Position Sensor Supply
🔍 Incorrect Brake Booster Motor A Position Sensor Supply installed (wrong part number)
🔍 Related system mechanical issue affecting Brake Booster Motor A Position Sensor Supply readings

Frequently Asked Questions

What does C05BB mean?

C05BB indicates: Brake Booster Motor A Position Sensor Supply Circuit Range/Performance. The vehicle's computer has detected that the Brake Booster Motor A Position Sensor Supply is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C05BB?

Only short distances if absolutely necessary. C05BB affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C05BB?

Repair costs for C05BB typically range from $50 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 clean Brake Booster Motor A Position Sensor Supply
🔧 Replace degraded Brake Booster Motor A Position Sensor Supply
🔧 Check for related mechanical issues affecting readings

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.

C05BB: Brake Booster Motor A Position Sensor Supply Circuit Range/Performance