Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the sensor that tells your car's computer where the brake pedal is. It's like when a video game controller button isn't working right.
The C05CC code is triggered when the brake master cylinder piston position sensor sends a signal to the vehicle's computer that is out of the expected range or performance parameters.
The brake master cylinder piston position sensor monitors the position of the brake pedal and sends this information to the vehicle's electronic control unit (ECU). If the signal from this sensor is outside the expected range or does not perform as expected, the C05CC code is set.
• Brake warning light on the dashboard
• Inconsistent brake pedal feel
• Anti-lock braking system (ABS) may not function properly
• Faulty brake master cylinder piston position sensor
• Wiring issues or poor electrical connections
• Faulty ECU
ECU: Electronic Control Unit, the computer that controls various functions in a vehicle.
ABS: Anti-lock Braking System, a safety system that prevents the wheels from locking up during braking.
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors for damage or corrosion
• Test the brake master cylinder piston position sensor
• Replace the faulty brake master cylinder piston position sensor
• Repair or replace damaged wiring or connectors
• Reprogram or replace the ECU if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Malibu
• Buick LaCrosse
• Cadillac CTS
• Regularly inspect and maintain brake system components
• Ensure all electrical connections are secure and free of corrosion
• Follow the vehicle's maintenance schedule
Sensor Issue
• Do not ignore the brake warning light; have it checked promptly
• Drive cautiously if the brake system feels different
• Consult a professional mechanic for accurate diagnosis
Check with your vehicle manufacturer; sensor issues may be covered under powertrain or emissions warranty.
This code has been reported in vehicles with advanced braking systems, particularly those with electronic brake control modules.
High – Brake system issues can affect vehicle safety and should be addressed immediately.
Driving with a malfunctioning brake system can be dangerous and may violate traffic safety laws.
• Vehicle ignition on
• Brake pedal pressed
The brake master cylinder piston position sensor is typically located near the brake pedal or on the brake master cylinder.
Q: Can I drive with a C05CC code?
A: It's not recommended to drive with this code as it may affect the braking performance of your vehicle.
Q: How do I reset the C05CC code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.