Brake Switch Circuit Range/Performance Problem
A fault in the brake switch circuit has been detected.
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 is responsible for signaling when you press the brake pedal. If it fails or its signal is out of whack, the vehicle won’t know you’re braking, which can cause issues like not being able to shift out of park or improper engagement of other systems like cruise control.
What the computer is actually seeing
The computer monitors the brake switch to see if it is open (not pressed) or closed (pressed). If it sees a voltage signal out of the expected range (typically around 0 volts when not pressed and 5 volts when pressed), it triggers this code.
What a healthy reading looks like
Expected voltage at the brake switch should be close to 0 volts when the pedal is not pressed and around 5 volts when 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. Inspect the brake switch connections for damage or corrosion. Repair as necessary. Decision: Do connections look good? If yes, go to step 2. If no, repair and retest.
- 22. Check for continuity in the brake switch wiring. Use a multimeter to test for a short to ground or open circuit. Decision: Is there continuity? If yes, go to step 3. If no, repair wiring.
- 33. Test the brake switch operation: With the ignition on, monitor the brake switch voltage while pressing and releasing the brake pedal. Expected readings are close to 0 volts when released and 5 volts when pressed. Decision: Does the switch work properly? If yes, the problem might be in the brake control module. If no, replace the brake switch.
Common causes
- Faulty brake switch
- Wiring issues in brake switch circuit
- Poor connections or corroded terminals
- Faulty brake control module
- Intermittent failures in the circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's safe to drive, but your brake lights may not function correctly which can be a safety issue.
Will this problem come back after clearing the code?
It might, especially if the underlying issue (like a faulty switch or wiring) isn't fixed.
Why does this code often pair with other codes?
This code can be set due to broader issues in the brake system that affect multiple components, hence it can often accompany other related codes.
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