C05BF

Brake Booster Motor B Position Sensor Supply Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased brake pedal force
The brake system fault indicator is on
Uneven operation of the brake booster
Reduced braking performance

Causes

Brake booster motor position sensor fault B
Open or short circuit in wiring harness
Poor contact in connectors
Contact corrosion
Low voltage in the on-board network
Malfunction of the brake system control unit

How to Fix

Check the voltage in the on-board network
Inspect the wiring harness for damage
Check the contacts in the sensor and control unit connectors
Test brake booster motor position sensor B
If necessary, replace the sensor or wiring harness
Check and, if necessary, replace the brake system control unit

Related codes

C05BE C05C0 C05C1