C05D5 — Brake Master Cylinder Cut Off Valve

What Does C05D5 Mean?

C05D5 is a diagnostic trouble code indicating: Brake Master Cylinder Cut Off Valve. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C05D5

⚠️ Check Engine Light (MIL) illuminated
⚠️ Brake Master Cylinder Cut Off Valve not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ ABS or stability control warning light

Common Causes

🔍 Faulty Brake Master Cylinder Cut Off Valve
🔍 Wiring or connector issue in Brake Master Cylinder Cut Off Valve circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does C05D5 mean?

C05D5 indicates: Brake Master Cylinder Cut Off Valve. The vehicle's computer has detected that the Brake Master Cylinder Cut Off Valve is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C05D5?

Only short distances if absolutely necessary. C05D5 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C05D5?

Repair costs for C05D5 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 Brake Master Cylinder Cut Off Valve and related wiring
🔧 Replace faulty Brake Master Cylinder Cut Off Valve

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.

C05D5: Brake Master Cylinder Cut Off Valve