Brake Sensor Signal Malfunction
The brake sensor signal is erratic or missing.
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 system is sending inconsistent signals to the computer. This can happen if the sensors that detect if brakes are applied or released are faulty or have poor connections.
What the computer is actually seeing
The brake control module expects a steady voltage signal (generally around 0-5 volts) that indicates the brake status. When the brakes are applied, it sees a drop in voltage or a sudden spike outside of expected parameters.
What a healthy reading looks like
Brake applied: Voltage drops near 0V; Brake released: Voltage rises near 5V. Anything fluctuating significantly outside of this window is a problem.
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 all related wiring and connectors for damage or corrosion. Repair if necessary.
- 2Inspect the brake pedal sensor. Test voltage output with a multimeter when the pedal is pressed and released. Should be between 0-5V.
- 3If the sensor is good, check for poor ground connections at the brake control module.
- 4Clear the code and retest the system. If the code returns, consider replacing the brake control module.
Common causes
- Faulty brake pedal sensor
- Damaged wiring or connectors
- Poor ground connection on brake control module
- Faulty brake control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but it's not recommended. Braking performance might be compromised.
Will this code come back?
If the underlying issue is not fixed, yes, it will likely return.
Why does this code pair with others?
Codes indicate various aspects of the brake system; issues often overlap or relate to the same sensor faults.
Working a real vehicle right now?
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