Brake System Fluid Level Sensor Fault
Indicates a failure in the brake fluid level sensor circuit.
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 monitors how much fluid is in the brake reservoir. If it senses that the fluid level is below a certain point, it will trip this code.
What the computer is actually seeing
The brake fluid level sensor should provide a voltage signal between 0.5V to 4.5V, depending on the fluid level. When the level drops too low, the sensor outputs a lower voltage, triggering the fault code.
What a healthy reading looks like
Voltage from the brake fluid level sensor should be between 0.5V (low level) and 4.5V (full level).
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 the brake fluid level in the reservoir. Ensure it is at the correct level. If low, top off with the correct fluid and retest.
- 22. Inspect the wiring and connectors to the brake fluid level sensor for signs of damage or corrosion.
- 33. Measure the voltage at the brake fluid level sensor with the key on. It should range between 0.5V and 4.5V.
- 44. If voltage is out of range, replace the brake fluid level sensor and recheck the system.
Common causes
- Low brake fluid level
- Faulty brake fluid level sensor
- Wiring issues or corroded connectors in the sensor circuit
- Failed brake master cylinder
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but it's advisable to address it soon as low brake fluid can affect braking performance.
Will this code come back after I clear it?
If the underlying issue is unresolved, like low fluid or a faulty sensor, the code will likely return.
Why does this code sometimes pair with others?
It can occur with related brake system codes, indicating wider issues in braking components.
Working a real vehicle right now?
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