C004B
Brake Fluid Level Sensor/Switch Circuit/Open
C004B is an OBD-II diagnostic trouble code meaning: Brake Fluid Level Sensor/Switch Circuit/Open. Common causes: broken or damaged sensor wires, malfunction of the brake fluid level sensor. Estimated repair cost: $17–56.
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
Error C004B by Vehicle Brand
FAQ
What does the C004B code mean?
C004B is an OBD-II diagnostic trouble code that indicates: Brake Fluid Level Sensor/Switch Circuit/Open
What causes a C004B error code?
The most common causes of C004B include: Broken or damaged sensor wires; Malfunction of the brake fluid level sensor; Poor contact in the sensor connector; Low brake fluid level.
How do I fix a C004B diagnostic trouble code?
To fix C004B: Check the brake fluid level in the reservoir. Inspect the sensor wires and connectors for damage. Test the sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C004B?
Limited driving only, diagnose soon
How much does it cost to fix C004B?
The estimated repair cost for C004B is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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