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 38, Brake Switch Error: Notes
PCM monitors activity of the normally-closed brake switch. Switch opens when brake pedal is applied. Code will set if PCM has seen conditions which would have required brake applications at least 7 times and no transition in brake switch has been detected.
- Checks for voltage at brake switch.
- Simulates brake switch closed or brakes off. Checks brake switch circuit between PCM and switch.
- Checks circuit between brake switch and PCM.
Use the Manual With the Right Hardware
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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.
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