Brake Switch Circuit Problem
There's an issue with the brake switch circuit signal.
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 helps the computer know when you press the brake. If it doesn't work right, it can cause problems for systems that rely on knowing your braking status.
What the computer is actually seeing
The computer expects a voltage change when the brake pedal is pressed or released, typically from 0V (off) to around 5V (on).
What a healthy reading looks like
When the brake pedal is not pressed, the voltage should be close to 0V, and when pressed, it should be around 5V.
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 fluid level and top off if low.
- 2Inspect the wiring and connectors for damage or corrosion, repair as necessary.
- 3Measure the voltage at the brake switch: should be 0V when released and approximately 5V when pressed. If the readings are incorrect, replace the brake switch.
- 4If the switch checks out, verify the signal at the brake control module. Ensure power and ground are present.
Common causes
- Faulty brake switch
- Damaged wiring or connectors
- Corrosion in the connector
- Faulty brake control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but you could lose important features like cruise control until fixed.
Will this code come back after clearing?
If the issue isn't resolved, yes, it will likely come back.
Why does this code appear with other codes?
Multiple codes could indicate related faults in the brake system or connected modules.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →