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 thinks the brake helper motor isn't in the right spot. It's like when a toy robot's arm doesn't move to where it's supposed to.
The vehicle's brake booster motor position sensor has detected a position that is outside the expected range during its learning process.
The Brake Booster Motor A Position Sensor monitors the position of the brake booster motor. If the sensor detects a position that exceeds the learned limits, the system triggers the C004C code. This can affect the brake system's performance and safety.
• Brake warning light on
• Reduced braking performance
• Unusual brake pedal feel
• Faulty brake booster motor position sensor
• Wiring issues or poor electrical connections
• Faulty brake booster motor
Brake Booster: A device that helps increase the force applied to the brakes.
Position Sensor: A sensor that detects the position of a component, such as a motor.
• Check for additional codes.
• Inspect the wiring and connections to the brake booster motor position sensor.
• 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 brake booster motor if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure electrical connections are secure
• Replace worn components promptly
Sensor Issue
• Do not ignore the brake warning light.
• Consult a professional mechanic for accurate diagnosis.
Check vehicle warranty for coverage on brake system components.
This code has been associated with vehicles using advanced brake systems with electronic components.
High – Braking issues can affect vehicle safety and should be addressed promptly.
Driving with impaired brakes is dangerous and may be illegal. Ensure the vehicle is safe to operate.
• Vehicle parked on a level surface
• Ignition in the 'On' position without starting the engine
The brake booster motor and its position sensor are typically located near the firewall in the engine bay, connected to the brake pedal assembly.
Q: Can I drive with this code?
A: It's not recommended to drive with this code because it can affect your braking ability.
Q: How do I reset the code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, the code may reappear.
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.