Brake Fluid Level Sensor Circuit Malfunction
Brake fluid level sensor is not functioning properly.
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 fluid level sensor is either stuck or sending incorrect signals to the computer, which means it can't accurately tell if the brake fluid is low.
What the computer is actually seeing
The brake control module sees a constant high or low voltage signal from the brake fluid level sensor instead of the expected range indicating fluid level.
What a healthy reading looks like
Expected voltage range at the sensor should be between 0.5V (low) and 4.5V (normal).
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 fluid reservoir for fluid level: Should be above the minimum mark. If low, refill and check for leaks.
- 22. Check the wiring and connectors leading to the brake fluid level sensor for damage or corrosion.
- 33. Measure the voltage at the brake level sensor harness with a multimeter: It should be between 0.5V to 4.5V. If not, replace the sensor.
- 44. If the sensor voltage is correct but the code persists, check for shorts or opens in the wiring harness leading to the brake control module.
Common causes
- Faulty brake fluid level sensor
- Damaged wiring or connectors to the sensor
- Low brake fluid levels
- Corrosion in the brake fluid reservoir
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code showing?
It's moderate severity; you should address it soon as it impacts brake performance.
Will the fault code come back after resetting?
It can come back if the underlying issue, like a faulty sensor or wiring, isn't fixed.
Why does this code pair with other codes?
Brake system codes often trigger together due to shared wiring or components like the ABS system.
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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