C012A

Brake Master Cylinder Pressure Sensor

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

ABS or ESP indicator is on
Reduced braking performance
Incorrect operation of the stabilization system

Causes

Pressure sensor malfunction
Open or shorted wiring harness
Sensor connection problems
Brake ECU malfunction

How to Fix

Check the sensor connection and the condition of the wiring harness
Check sensor resistance
Replace pressure sensor if necessary
Check and update the ECU firmware

Related codes

C012B C012C C0110