C05A0Brake Pressure Sensor E Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C05A0 is set when sensor E reports a voltage above its usable range. In the Denso patent on vehicle pressure sensors the band from 4.7 to 5 V is reserved for faults, and a lost ground wire pushes the output into it through the divider formed by the sensor's internal resistance and the module's pull-down resistor. Honeywell's ratiometric transducers deliberately drive their output to 97.5 % of supply on an internal fault or overpressure, so a high code can also come from the sensor itself. A short to the 5 V reference or to battery voltage is the other common case. No maker publishes C05A0; GM's 2019 EBCM uses more than 95.24 % of supply for 100 ms on comparable sensors, Type A. The module would otherwise see braking that is not happening, so it ignores the sensor and limits ESC.
- What you may notice
- ABS/ESC warning lamp on
- Stability control unavailable, brake lights may be requested falsely on some systems
- Likely causes
- PossibleSignal shorted to the 5 V reference or to battery voltage
- PossibleOpen sensor ground lifting the output to the upper rail
- PossibleSensor signalling an internal fault at full scale
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.