C05CE

Brake Master Cylinder Piston Position Sensor B Circuit Voltage Low

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

The brake system fault indicator is on
Reduced braking performance
Incorrect operation of ABS or ESP

Causes

Open or short circuit in wiring harness
Piston position sensor malfunction
Poor contact in connectors
Brake ECU malfunction

How to Fix

Check wiring harness for damage
Check sensor and ECU connectors
Check sensor resistance and voltage
Replace sensor if necessary
Check the operation of the computer

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