C05BA

Brake Booster Motor A Position Sensor Supply Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Brake warning light comes on
Reduced braking performance
Brake pedal hardness
Malfunction of brake assistance systems (if equipped)

Causes

Brake booster position sensor malfunction
Open or short circuit in wiring harness
Poor contact in connectors
Malfunction of the brake system control module
Sensor power problems

How to Fix

Check the voltage in the sensor power circuit
Inspect the wiring harness and connectors for damage.
Check the resistance of the position sensor
Scan the system for other errors
If necessary, replace the sensor or wiring harness
Reset the error and check for reappearance

Related codes

C05BB C05BC C05BD