OBD Guide
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C12FF

Brake Booster Performance

C12FF is an OBD-II diagnostic trouble code meaning: Brake Booster Performance. Common causes: vacuum leak in the amplifier system, booster check valve malfunction. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • The brake pedal is slow
  • Increased brake pedal travel
  • Check Engine Light Illuminates
  • Reduced braking performance

Causes

  • Vacuum leak in the amplifier system
  • Booster check valve malfunction
  • Amplifier diaphragm damage
  • Vacuum system hoses leaking
  • Problems with the vacuum pump (on diesel engines)

How to Fix

  1. Check the integrity of vacuum hoses and connections
  2. Check the operation of the amplifier check valve
  3. Conduct diagnostics of the vacuum pump (for diesel engines)
  4. Check the vacuum booster for leaks
  5. If necessary, replace the brake booster

Related codes

C1201P0504

FAQ

What does the C12FF code mean?

C12FF is an OBD-II diagnostic trouble code that indicates: Brake Booster Performance

What causes a C12FF error code?

The most common causes of C12FF include: Vacuum leak in the amplifier system; Booster check valve malfunction; Amplifier diaphragm damage; Vacuum system hoses leaking.

How do I fix a C12FF diagnostic trouble code?

To fix C12FF: Check the integrity of vacuum hoses and connections. Check the operation of the amplifier check valve. Conduct diagnostics of the vacuum pump (for diesel engines). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C12FF?

Limited driving only, diagnose soon

How much does it cost to fix C12FF?

The estimated repair cost for C12FF is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat