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.
DTC 41, Brake Switch Circuit Fault: Notes
TCC normally closed brake switch supplies a battery voltage signal on TCC brake switch signal circuit to PCM. Circuit is open when brakes are applied. Brake light/cruise control normally open brake switch supplies a battery voltage signal on cruise control/brake switch signal circuit to PCM when brakes are applied. DTC 41 will set when:
- Switches disagree for 10 consecutive minutes.
Or
- TCC and cruise control brake switches are not toggling open and closed during 6 brake applications on same ignition cycle.
PCM will default to an incorrect brake signal can affect TCC, 4th gear operation, in hot mode and cruise control.
- This step checks for voltage at brake switch.
- This step simulates brake switch closed or brakes off.
- This step checks for ignition feed to TCC brake switch.
- This step checks TCC brake switch signal circuit and simulates brakes being applied.
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.