Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code A041: Brake Switch Circuit Open
When the brake pedal is pressed, the anti-lock brake controller senses voltage at the brake apply input. If voltage is absent, anti-lock brake controller will ground through circuit No. 20 or the brakelights. Code A041 will also set if hazard lights are turned on and stoplight is non-functional. To set Code A041, the following conditions must occur.
- Battery voltage is not sensed at brake apply input (brake switch open).
- Anti-lock brake controller does not sense ground through circuit No. 20 (Brake-Apply Input).
- Isolates open to circuit No. 20 between brake switch and BRAKE warning indicator light (light off), or circuit No. 20 between brake switch and anti-lock brake controller (light on).
- Observe state of brake switch. If brake switch is closed, anti-lock brake controller is sensing correct input.
- Isolate open to circuit No. 20 between brake switch and anti-lock brake controller if zero volt is measured. If circuit No. 20 is okay, replace anti-lock brake controller.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.