C0022

Brake Booster Solenoid

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Hard brake pedal
Increased brake pedal travel
The brake system fault light comes on
Reduced braking performance

Causes

Open or short circuit in solenoid circuit
Brake booster solenoid malfunction
Problems with the control unit
Wiring harness damage

How to Fix

Check the resistance of the brake booster solenoid
Inspect the wiring harness for damage
Check voltage at solenoid connector
Replace solenoid if necessary
Reset the error and check the system operation

Related codes

C0021 C0023 C0024