C0240Brake Pressure Sensor
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0240 cannot be verified publicly: it is missing from the accessible J2012 lists, from the NHTSA bulletin index, from GM's PIP5094 keyword list and from the Saab and Mitsubishi indexes. Only the part in the title can be described. In a modern brake control unit a pressure sensor reports how hard the driver presses; on the TRW EBC450 of the 2011 Saab 9-5 it is built into the valve block. The module feeds it 5 V and expects about 0 V with the pedal released and more than 1 V when braking. A broken supply or signal line, or a reading that does not fit the deceleration or brake switch, disables ABS, traction and stability control; GM files that fault under C0131. Brake assist and stability control use this signal to judge braking demand.
- What you may notice
- ABS, traction and stability warning lamps on
- Brake assist and stability control unavailable
- Likely causes
- PossibleOpen or shorted 5 V supply or signal wire to the pressure sensor
- PossibleFaulty pressure sensor inside the hydraulic unit
- RareSensor offset not calibrated after module or valve block replacement
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.