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C05B5: Brake Booster Temperature Sensor C Circuit/Open

Severity
High
System
Chassis
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

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

Common Causes

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. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

C0500 Left Front Wheel Speed Sensor A Circuit/Open C0501 Left Front Wheel Speed Sensor A Range/Performance C0502 Left Front Wheel Speed Sensor A Circuit Low C0503 Left Front Wheel Speed Sensor A Circuit High C0504 Left Front Wheel Speed Sensor A Intermittent/Erratic C0505 Left Front Wheel Speed Sensor A Correlation C0506 Right Front Wheel Speed Sensor A Circuit/Open C0507 Right Front Wheel Speed Sensor A Range/Performance C0508 Right Front Wheel Speed Sensor A Circuit Low C0509 Right Front Wheel Speed Sensor A Circuit High