C0044: Brake Pressure Sensor "A"
The control unit has detected a fault with brake pressure sensor A.
High risk
Have it checked soon. Brake assistance and stability control may be limited.
Short answer · Can I keep driving with C0044?
Usually yes, with care. Brake assistance and stability control may be limited. Have it checked soon.
What does C0044 mean?
C0044 points to a pressure sensor in the brake hydraulic unit or master cylinder. The brake system uses it to recognise how hard you brake.
What the car does when the code is set
The brake warning light may come on, and brake assistance or ABS functions may be limited.
How the system works
Modern brakes use sensors for fluid level, pedal position, pressure and pad wear. The brake control unit uses them for ABS, brake assistance and warnings.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Low brake fluid levelWorn pads or a leak lower the level in the reservoir.
- Faulty sensorPressure, travel or level sensors can fail internally.
- Wiring or connector faultDamaged wires or corroded plugs give wrong signals.
- Air or moisture in the brake fluidOld fluid or a leak changes how the system behaves.
- Brake booster or hydraulic unit faultPossible once fluid, sensors and wiring have been checked.
How it is diagnosed
- Check the brake fluid levelWith the car level, the fluid should sit between MIN and MAX.If the level is low or the pedal feels soft, do not drive; have the car recovered.
- Look for leaksCheck behind each wheel and around the master cylinder for fluid.
- Check the padsWorn pads lower the fluid level and may trigger wear warnings.
- Read live dataA workshop compares sensor values with the pedal at rest and pressed.
Questions about C0044
Is the pressure sensor part of the ABS unit?
On many cars it is built into the ABS hydraulic unit and is replaced with it.
Is a brake system code an emergency?
It can be. If the brake warning light is red or the pedal feels different, stop driving and have the car checked.