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 93, Brake Switch Circuit Open During Initialization: Notes
When wheel speed sensors indicate to ABS module that vehicle is braking, ABS module should receive voltage from brake switch. If ABS module does not receive voltage, ABS operation will be disabled and ABS light will illuminate. Check for Code 95. If Code 95 is set, diagnose it first.
Code 93 will set if brake switch circuit is open during initialization. This code can be set only if Code 91 or 92 was set on 7 previous ignition cycles and no brake transition has been seen since.
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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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