C05B9
Brake Booster Motor A Position Sensor Supply Circuit Low
C05B9 is an OBD-II diagnostic trouble code meaning: Brake Booster Motor A Position Sensor Supply Circuit Low. Common causes: open or short circuit in the sensor wiring harness, brake booster motor position sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- Increased brake pedal force
- The brake system fault indicator lights up
- Reduced braking performance
Causes
- Open or short circuit in the sensor wiring harness
- Brake booster motor position sensor malfunction
- Problems with power or grounding of the circuit
- Malfunction of the brake control unit (ECU)
How to Fix
- Check the wiring harness for damage or corrosion.
- Measure the voltage in the sensor power circuit
- Check the resistance of the position sensor
- If necessary, replace the sensor or wiring harness
- Check and, if necessary, replace the brake system control unit
Related codes
Error C05B9 by Vehicle Brand
FAQ
What does the C05B9 code mean?
C05B9 is an OBD-II diagnostic trouble code that indicates: Brake Booster Motor A Position Sensor Supply Circuit Low
What causes a C05B9 error code?
The most common causes of C05B9 include: Open or short circuit in the sensor wiring harness; Brake booster motor position sensor malfunction; Problems with power or grounding of the circuit; Malfunction of the brake control unit (ECU).
How do I fix a C05B9 diagnostic trouble code?
To fix C05B9: Check the wiring harness for damage or corrosion.. Measure the voltage in the sensor power circuit. Check the resistance of the position sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C05B9?
Limited driving only, diagnose soon
How much does it cost to fix C05B9?
The estimated repair cost for C05B9 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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