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 P090, TCC Brake Switch Input Circuit Problem: Notes
This test assumes that brake must be applied to bring vehicle to a stop from 30 MPH or greater. If such condition occurs, counter is incremented. When counter reaches 10, Code P090 is set. Counter is reset to zero if a transition of TCC brake switch is detected by PCM before counter reaches 10.
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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.