Brake Switch Circuit Malfunction
There's a problem with the brake switch signal circuit.
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 computer when you press the brake pedal. If it doesn't send the right signal, the computer can't tell if you're stopping, which can affect systems like cruise control and ABS.
What the computer is actually seeing
The computer expects a voltage change from the brake switch when the pedal is pressed. Typically, it expects around 0 volts when released and about 5 volts when pressed.
What a healthy reading looks like
0-0.5V (released), 4.5-5V (pressed)
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 connector for the brake switch for any damage or corrosion. Repair as necessary.
- 22. Test the brake switch operation by measuring voltage at the switch connector with the pedal pressed and released. You should see 0-0.5V when released and 4.5-5V when pressed.
- 33. If the voltage readings are incorrect, replace the brake switch. If correct, inspect the wiring harness for continuity back to the computer. Repair any broken connections.
- 44. Clear the code and take the vehicle for a test drive. If the code returns, investigate further into the wiring or the vehicle's computer.
Common causes
- Faulty brake switch
- Wiring issue in brake switch circuit
- Corroded connector pins
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but be aware that systems reliant on the brake switch, like ABS and cruise control, may not function correctly.
Will this code come back after I fix it?
If the cause is correctly identified and repaired, the code should not return.
Why does this code sometimes pair with ABS issues?
The brake switch affects ABS functionality, so if there's a malfunction, it might trigger both codes.
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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