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 car's brake lights. They might not be turning on when you press the brake pedal.
The C0023 code indicates that the vehicle's computer has detected an issue with the circuit that controls the stop lamps (brake lights).
The C0023 code is triggered when there is a malfunction in the stop lamp control circuit. This could be due to a wiring issue, a faulty stop lamp switch, or a problem with the lamp itself. The stop lamp circuit is crucial as it signals to other drivers that the vehicle is slowing down or stopping.
• Brake lights not illuminating
• Brake lights stuck on
• Warning light on the dashboard
• Faulty stop lamp switch
• Blown stop lamp fuse
• Damaged wiring or connectors
Stop Lamp: Another term for brake light.
Circuit: A complete path that allows electricity to flow.
• Check the brake light bulbs for any damage.
• Inspect the stop lamp fuse and replace if necessary.
• Test the stop lamp switch for proper operation.
• Replace faulty stop lamp switch.
• Repair or replace damaged wiring.
• Replace blown stop lamp fuse.
• Multimeter
• Screwdriver set
• Replacement bulbs or fuses
$50 - $200
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regularly check brake lights.
• Inspect wiring for wear and tear.
• Replace bulbs promptly when they burn out.
Electrical Circuit Issue
• Check brake lights regularly to ensure they are working.
• Have a professional inspect the brake light system if you notice issues.
Check with your vehicle manufacturer for warranty coverage on electrical components.
This code has been associated with issues in vehicles with aging electrical systems or those frequently exposed to harsh conditions.
High – Brake lights are essential for safe driving and to communicate with other drivers.
Driving with non-functional brake lights can lead to accidents and is illegal in most jurisdictions.
• Vehicle in park with engine running.
• Press brake pedal and observe brake light operation.
The stop lamp switch is usually located near the brake pedal, while the lamps are at the rear of the vehicle.
Q: Can I drive with a C0023 code?
A: It's not safe to drive with this code because your brake lights may not work properly.
Q: How do I know if my brake lights are working?
A: Have someone stand behind the car while you press the brake pedal, or check for reflections in a window or wall.
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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