C122D
Active Brake Booster Control Circuit
C122D is an OBD-II diagnostic trouble code meaning: Active Brake Booster Control Circuit. Common causes: open or short circuit in wiring harness, faulty booster solenoid valve. Estimated repair cost: $56–167.
Symptoms
- Increased brake pedal travel
- Hard brake pedal
- The brake system fault light is on
- Reduced braking performance
Causes
- Open or short circuit in wiring harness
- Faulty booster solenoid valve
- Problems with the brake system control unit
- Low brake fluid level
- Brake pedal sensor malfunction
How to Fix
- Check the brake fluid level
- Inspect the wiring harness for damage
- Check the amplifier solenoid valves
- Read additional fault codes
- Test the brake system control unit
Related codes
FAQ
What does the C122D code mean?
C122D is an OBD-II diagnostic trouble code that indicates: Active Brake Booster Control Circuit
What causes a C122D error code?
The most common causes of C122D include: Open or short circuit in wiring harness; Faulty booster solenoid valve; Problems with the brake system control unit; Low brake fluid level.
How do I fix a C122D diagnostic trouble code?
To fix C122D: Check the brake fluid level. Inspect the wiring harness for damage. Check the amplifier solenoid valves. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C122D?
Limited driving only, diagnose soon
How much does it cost to fix C122D?
The estimated repair cost for C122D is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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