C004C

Brake Booster Motor A Position Sensor Exceeded Learning Limit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–444 (est.)

Symptoms

Hard brake pedal
CHECK lamp lights up
Reduced braking performance
Rattling sounds from vacuum amplifier

Causes

Position sensor malfunction
Open or short circuit in wiring harness
Oxidation of sensor connector contacts
Mechanical wear of the vacuum booster
Software failure in the brake system control unit

How to Fix

Diagnostics of the sensor and wiring harness with a multimeter
Checking connections for oxidation
Replacing the position sensor if necessary
Adaptation of a new part via a scanner
Replacing the vacuum booster in case of mechanical damage

Related codes

C0041 C0050 C0072