C05CF

Brake Master Cylinder Piston Position Sensor B Circuit Range/Performance

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

The brake system fault indicator is on
Deterioration in braking performance
Activating the emergency brake system
Unstable brake operation

Causes

Master Cylinder B Piston Position Sensor Malfunction
Open or short circuit in the sensor wiring harness
Poor contact in the sensor connector
Master cylinder malfunction
Problems with the brake ECU

How to Fix

Check the integrity of the sensor wiring harness
Check connections and contacts in the sensor connector
Check resistance and sensor signal
If necessary, replace the piston position sensor
Check and, if necessary, replace the brake master cylinder
Check the operation of the brake system ECU

Related codes

C05CE C05D0 C1210