C0544Brake Pressure Sensor B Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The brake module sees a general electrical fault in the circuit of pressure sensor B, usually an interruption in signal, feed or ground. No maker publishes this exact meaning; note that GM bulletins use C0544 for a different, steering-related fault in its power steering module, so a GM scan result must be read with GM definitions. For the component itself, Saab 9-5 (2011) data shows how such circuits are watched: the brake module watches both the sensor feed and its output line, sets a fault after 0.1 s of open or high resistance and disables ABS, traction and stability control for that ignition cycle. Bentley shows that sensor B can sit inside the ESC unit, which then has to be replaced as a whole. C0541 covers implausible values, C0542 and C0543 low and high voltage.
- What you may notice
- ABS, traction and stability warning lamps on
- Driver assistance relying on brake pressure unavailable
- Likely causes
- LikelyConnector at sensor or brake module loose or corroded
- PossibleInterrupted signal, feed or ground wire
- RareOpen inside the sensor or the ESC unit carrying it
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.