Brake Switch Signal Circuit
Indicates a possible issue 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 PCM expects a signal from the brake switch when you press the brake pedal; if it doesn't see it, a fault code is set.
What the computer is actually seeing
The brake switch should close (sending a signal) when the brake pedal is pressed, providing a voltage typically around 0.5 volts when open and nearly battery voltage (around 12 volts) when closed.
What a healthy reading looks like
Brake switch should show 12V when the pedal is pressed and close to 0V when released.
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 brake fluid level and ensure brake lights work; if they don't, check the brake switch.
- 2Inspect the wiring and connectors to the brake switch for damage or corrosion. Repair as needed.
- 3Use a multimeter to measure voltage at the brake switch: it should show approximately 12V when the pedal is pressed. If not, repair wiring or replace the switch.
Common causes
- Faulty brake switch
- Wiring issues (broken or shorted wire)
- Corroded connectors
- Faulty PCM (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you won't have cruise control and brake lights may not function properly.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why would this affect my cruise control?
The brake switch is crucial for disengaging cruise control; if it's faulty, the system cannot function correctly.
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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