Brake System Pressure Sensor Range/Performance Problem
This code indicates an issue with the brake system pressure sensor.
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 pressure sensor measures how hard you're pressing the brake pedal and sends that info to the computer. If it sees numbers outside of its normal range, it sets this code. For example, if the sensor is supposed to read between 0.5V and 4.5V under normal conditions, and it reads below 0.5V or above 4.5V, it triggers the code.
What the computer is actually seeing
The brake system pressure sensor should provide a voltage signal that varies based on brake pressure. The computer expects a steady voltage, typically anywhere from 0.5-4.5 volts, depending on how hard the brakes are applied.
What a healthy reading looks like
Normal voltage range is 0.5 to 4.5 volts from the sensor based on brake pressure.
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. Check brake fluid level; it should be within the recommended range. If low, top off and retest the system.
- 22. Inspect the wiring and connectors for any signs of damage or corrosion; repair as necessary.
- 33. Use a scan tool to read the live data from the brake system pressure sensor; confirm its voltage range is matching expected values.
- 44. If the sensor readings are out of range, swap the sensor with a known good one to see if the code returns.
- 55. If the code clears and does not return with a good sensor, then this confirms a faulty sensor. If it returns, the issue may lie within the ABS module or further wiring issues.
Common causes
- Faulty brake system pressure sensor
- Wiring or connector issues
- Brakes low on fluid
- Failed brake master cylinder or components
- Calibration issue in ABS module
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's typically drivable, but braking performance may be compromised, so fix it soon.
Will this code come back after I clear it?
If the root cause isn't resolved, it will likely return after clearing.
Why does this code sometimes appear with ABS codes?
This code can appear with ABS issues because they share similar systems; a problem in one can affect the other.
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