Brake Pedal Position Sensor Voltage - Low
The brake pedal position sensor is reporting a low voltage.
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 pedal position sensor measures how much you press the brake. If it says there's no pressure when you are braking, there's likely a problem with the sensor or its wiring.
What the computer is actually seeing
The computer sees that the brake pedal position sensor voltage is below 0.2 volts when it should be between 0.5V to 4.5V depending on the pedal position.
What a healthy reading looks like
Brake pedal position sensor voltage range should be between 0.5V (unpressed) and 4.5V (fully 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.
- 1Check the brake fluid level in the master cylinder. If low, top off and see if the code clears.
- 2Inspect the wiring and connectors to the brake pedal position sensor for damage or corrosion, repair as necessary.
- 3Using a multimeter, check the brake pedal position sensor voltage while pressing the pedal. Should read between 0.5V and 4.5V. If not, replace the sensor.
Common causes
- Faulty brake pedal position sensor
- Wiring issues or damaged connectors
- Brakes fluid level low affecting hydrostatic pressure
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving with a low brake pedal signal can affect braking performance, so it's advised to fix it soon.
Will the code come back?
If the underlying issue isn't resolved, the code will likely return.
Why does this code pair with SPN 731?
SPN 731 is typically triggered when there's a problem with the brake system, which is related to the pedal position.
Working a real vehicle right now?
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