C004B

Brake Fluid Level Sensor/Switch Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Low brake fluid indicator light is on
False warnings on the dashboard
Malfunction of the ABS or ESP system (in some cases)

Causes

Broken or damaged sensor wires
Malfunction of the brake fluid level sensor
Poor contact in the sensor connector
Low brake fluid level

How to Fix

Check the brake fluid level in the reservoir
Inspect the sensor wires and connectors for damage
Test the sensor with a multimeter
Replace the sensor or repair damaged wires
Reset the error with an OBD-II scanner

Related codes

C004A C004C C0110