Brake Switch Circuit Malfunction
The brake switch circuit has a malfunction.
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 tells the vehicle when you're pressing the brakes. If it's not working, it can't send the right signal to the rest of the system which might affect other features like cruise control or braking stability.
What the computer is actually seeing
The computer expects a closed contact at 0 volts when the brakes are pressed, and an open contact with battery voltage (around 12-14 volts) when not pressed. If it sees a constant voltage or no change, it'll trigger the code.
What a healthy reading looks like
0V when pressed (closed), 12-14V when not pressed (open).
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.
- 1Check the brake switch connector for corrosion or damage (first check).
- 2Test the brake switch operation: should read 0V when pressed and 12-14V when released.
- 3Inspect the wiring from the brake switch to the control module for any signs of wear or damage.
- 4If the switch tests okay and wiring is good, check the brake control module for faults using a scan tool.
Common causes
- Faulty brake switch
- Wiring issues or short circuits in the brake switch circuit
- Corroded connectors
- Faulty brake control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It can be safe, but be cautious as features like cruise control and automated braking may not function properly.
Will the code come back after resetting?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code sometimes show up with others?
This code can pair with others related to braking systems, as they share components and circuits.
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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