C05CD

Brake Master Cylinder Piston Position Sensor B Circuit Voltage High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Incorrect operation of the brake system
Brake fault light comes on
Loss of braking efficiency

Causes

Master Cylinder B Piston Position Sensor Malfunction
Short circuit in the sensor circuit
Wiring harness damage
Malfunction of the brake control unit (ECU)

How to Fix

Check the integrity of the wiring harness and sensor connections
Measure resistance and voltage at the sensor
Replace sensor if necessary
Check and replace ECU if necessary

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