C063EBrake Pressure Sensor J Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C063E: sensor J sends more voltage than its range allows. GM's 2016 hybrid brake controller shows the method on a wheel pressure sensor: if the signal line exceeds 3.3 V and so no longer differs from the supply, a short to supply is stored after 0.1 s with the ignition on, rated Type A. Denso's patent explains the second route: with a pull-down at the input, an open sensor ground forms a divider that pushes the line beyond 4.7 V. No public source says which part is sensor J; brake-by-wire units such as Bosch Motorsport's EBS already measure axle, driver, caliper and master cylinder pressure separately. A falsely high value would look like braking that is not happening, so the module discards the signal and limits its functions.
- What you may notice
- Brake or ESC warning lamp on
- Live data shows brake pressure although no one is braking
- Likely causes
- PossibleSignal line shorted to the sensor supply
- PossibleSensor ground interrupted, output lifted through the input divider
- RareSensor J electronics failed with output stuck high
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.