Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is taking too long to control the brakes. It's like when you press a button on a remote and it takes a long time for the TV to respond.
The brake system control module is taking longer than expected to perform its functions, which could indicate a problem with the module or its communication.
The C109C code indicates that the brake system control module is experiencing delays in its operations. This could be due to software issues, electrical problems, or hardware malfunctions within the module or its related components.
• ABS warning light on
• Delayed braking response
• Unusual brake pedal feel
• Faulty brake system control module
• Electrical wiring issues
• Software glitches in the control module
OBD-II: On-Board Diagnostics, a standardized system for self-diagnosing vehicle issues.
Control Module: An electronic device that manages specific functions in a vehicle.
• Perform a visual inspection of the brake system wiring and connectors.
• Use a diagnostic scanner to check for additional codes.
• Test the brake system control module for proper operation.
• Repair or replace damaged wiring or connectors.
• Reprogram or update the brake system control module software.
• Replace the brake system control module if faulty.
• OBD-II scanner
• Multimeter
• Brake system diagnostic tools
$200 - $800
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect brake system wiring.
• Keep software updated.
• Perform routine brake maintenance.
Control Module Performance
• Have your brakes inspected regularly.
• Address warning lights promptly.
• Ensure software is up-to-date.
Check with your vehicle manufacturer for warranty coverage on control modules.
This code has been associated with vehicles that experience communication delays in the brake system, often due to software updates or electrical issues.
Moderate – It should be addressed soon to ensure safe braking performance.
Driving with a malfunctioning brake system can be dangerous. Address any brake system warnings promptly.
• Vehicle stationary with ignition on.
• Diagnostic equipment connected.
The brake system control module is typically located near the brake pedal or within the engine compartment.
Q: Can I drive with a C109C code?
A: It's not recommended to drive with this code active, as it may affect braking performance.
Q: How do I reset the C109C code?
A: You can reset the code using an OBD-II scanner after the issue has been resolved.
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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