C05C3

Brake Booster Motor A Supply Circuit

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased brake pedal force
Reduced braking performance
ABS/ESP warning light is on

Causes

Open or short circuit in wiring harness
Fuse failure
Relay fault
Problems with the brake booster motor

How to Fix

Check fuses and relays
Diagnose the wiring harness for open/short circuit
Check the power and ground of the motor
Replace the amplifier motor if necessary

Related codes

C05C1 C05C2 C05C4