C012F

Brake Boost Solenoid Valve Circuit Malfunction

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–278 (est.)

Symptoms

Stiff brake pedal, increased force required to brake
The brake warning light on the dashboard is on
Increased braking distance
Extraneous sounds when the brake booster operates
ABS or ESP light is on

Causes

Brake booster solenoid valve malfunction
Open or short circuit in valve wiring harness
Oxidation or damage to the solenoid connector
Malfunction of the brake system control unit
Vacuum leak in the amplifier system

How to Fix

Carry out diagnostics with a scanner that supports the brake system.
Check the brake booster solenoid valve with a multimeter (winding resistance)
Inspect the wiring and solenoid connector for damage and oxidation.
Check for vacuum in the amplifier system
Replace faulty solenoid or repair wiring
After repair, reset the error and perform a test drive

Related codes

C0110 C0120 C0121 C0135