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 electric parking brake system in your car. It's like when a remote control doesn't work because the signal is too strong or not working right.
The C0618 code indicates that the control circuit for the park brake control module is experiencing a high voltage condition.
The park brake control module is responsible for managing the electronic parking brake system. A 'circuit high' condition means that the voltage in the control circuit is higher than the expected range. This can be caused by wiring issues, a faulty module, or other electrical problems.
• Parking brake warning light is on
• Parking brake not engaging or releasing properly
• Error message on the dashboard
• Faulty park brake control module
• Short circuit in the wiring
• Poor electrical connections
Circuit: A complete path that allows electrical current to flow.
Module: An electronic component that controls a specific function in the vehicle.
• Check for any blown fuses related to the parking brake system.
• Inspect the wiring and connectors for damage or corrosion.
• Test the voltage levels at the park brake control module.
• Replace any damaged wiring or connectors.
• Repair or replace the park brake control module if faulty.
• Ensure all electrical connections are secure and clean.
• Multimeter
• OBD-II scanner
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain the vehicle's electrical system.
• Avoid exposure to moisture and corrosion.
• Ensure proper installation of aftermarket electronic devices.
Electrical Circuit Issue
• Avoid using the parking brake until the issue is resolved.
• Consult a professional mechanic for accurate diagnosis and repair.
Check with the vehicle manufacturer for warranty coverage on electronic components.
This code is commonly seen in vehicles with electronic parking brake systems, particularly in models with high mileage.
Moderate – It is advisable to address this issue soon to ensure the parking brake functions correctly.
Driving with a malfunctioning parking brake can be unsafe and may lead to vehicle control issues.
• Vehicle parked on a level surface
• Ignition in the 'on' position
The park brake control module is typically located near the rear of the vehicle, often close to the rear axle or within the cabin near the driver's seat.
Q: Can I drive with a C0618 code?
A: It's not safe to drive with a malfunctioning parking brake system. Get it checked as soon as possible.
Q: Will the C0618 code clear itself?
A: The code may clear temporarily, but the underlying issue needs to be fixed to prevent it from returning.
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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