Brake Switch Circuit High Input
The brake switch is signaling a high input condition.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The brake switch that tells the computer when you press the brake pedal is sending too much voltage, indicating it thinks the brake is always on.
What the computer is actually seeing
The brake switch should output a voltage of around 0.5 to 1.5 volts when the pedal is not pressed and 4.5 to 5 volts when pressed. In this case, it's reading above 5 volts constantly, which is out of spec.
What a healthy reading looks like
Brake switch output should be 0.5-1.5V (off) and 4.5-5V (on).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors at the brake switch for any damage or corrosion. Repair if needed. Decision: Good condition? Go to step 2; else, fix wiring/connectors and retest.
- 22. Measure voltage at the brake switch connector with the pedal not pressed. Should be 0.5-1.5 volts. Decision: Is it within spec? If yes, go to step 3; else, replace the brake switch.
- 33. With the pedal pressed, measure voltage at the same connector. Should be 4.5-5 volts. Decision: Is it within spec? If yes, check with a scan tool for further codes; else, check for wiring shorts or poor grounds.
Common causes
- Faulty brake switch
- Wiring issues or short circuits in the brake switch circuit
- Poor ground connection for the brake switch
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but you may have issues with braking systems like cruise control and traction control until it's fixed.
Will this code come back after clearing it?
It can come back if the underlying issue isn't resolved, such as a faulty switch or wiring problem.
Why do I see this code paired with others?
This code often appears with others related to brake systems, as multiple sensors and circuits are monitored together.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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