C05CB
Brake Master Cylinder Piston Position Sensor A Circuit Voltage Low
C05CB is an OBD-II diagnostic trouble code meaning: Brake Master Cylinder Piston Position Sensor A Circuit Voltage Low. Common causes: open or short circuit in the sensor wiring harness, piston position sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- The brake system fault light comes on
- Reduced braking performance
- Activation of the ABS/ESP system for no apparent reason
- Unstable brake operation
Causes
- Open or short circuit in the sensor wiring harness
- Piston position sensor malfunction
- Poor contact in sensor connectors
- Malfunction of the brake control unit (ECU)
How to Fix
- Check the sensor wiring harness for breaks and short circuits
- Check sensor connectors for oxidation and poor contact
- Replace the piston position sensor if it is faulty
- Check and, if necessary, replace the brake control unit (ECU)
Related codes
Error C05CB by Vehicle Brand
FAQ
What does the C05CB code mean?
C05CB is an OBD-II diagnostic trouble code that indicates: Brake Master Cylinder Piston Position Sensor A Circuit Voltage Low
What causes a C05CB error code?
The most common causes of C05CB include: Open or short circuit in the sensor wiring harness; Piston position sensor malfunction; Poor contact in sensor connectors; Malfunction of the brake control unit (ECU).
How do I fix a C05CB diagnostic trouble code?
To fix C05CB: Check the sensor wiring harness for breaks and short circuits. Check sensor connectors for oxidation and poor contact. Replace the piston position sensor if it is faulty. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C05CB?
Do not drive — repair immediately
How much does it cost to fix C05CB?
The estimated repair cost for C05CB is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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