Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer noticed a problem with the part that helps you brake. It's like when your toy car's remote control doesn't work because the batteries are too powerful.
The Brake Booster Motor A Position Sensor Supply Circuit High code indicates that the voltage in the circuit that powers the brake booster motor's position sensor is higher than expected.
The C05BA code is set when the vehicle's control module detects a voltage level that is higher than the specified range in the brake booster motor's position sensor supply circuit. This sensor is crucial for monitoring the position of the brake booster motor to ensure proper brake function.
• Brake warning light on the dashboard
• Reduced braking performance
• Unusual brake pedal feel
• Faulty brake booster motor position sensor
• Wiring issues such as short to voltage
• Faulty control module
Brake Booster: A device that uses vacuum pressure to help reduce the effort needed to apply the vehicle's brakes.
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
• Use a scan tool to verify the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the brake booster motor position sensor for proper operation.
• Replace the brake booster motor position sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the control module if necessary.
• OBD-II scan tool
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular vehicle maintenance
• Inspect brake system components periodically
• Ensure electrical connections are secure and clean
Sensor Issue
• If the brake warning light is on, drive cautiously and have the vehicle inspected as soon as possible.
• Avoid heavy braking until the issue is resolved.
Check with the vehicle manufacturer for specific warranty coverage related to the brake system.
This code has been reported in vehicles with electronic brake systems, particularly in models with advanced braking features.
High – This issue affects the braking system, which is critical for vehicle safety.
Driving with a malfunctioning brake system can be dangerous. Address this issue promptly to ensure safe vehicle operation.
• Vehicle ignition in the ON position
• Brake system components connected
The brake booster motor position sensor is typically located near the brake booster assembly in the engine compartment.
Q: Can I drive with a C05BA code?
A: It's not recommended to drive with this code active as it can affect braking performance.
Q: How do I clear the C05BA code?
A: The code can be cleared with an OBD-II scanner after the issue is resolved, but it will return if the problem persists.
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.
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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.
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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.
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