C063DBrake Pressure Sensor J Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- A wire or contact of brake pressure sensor J is interrupted. No manufacturer ties C063D to a specific sensor. Continental's one-box brake patent names sensors for the master cylinder and for the pressure supply unit and mentions optional further ones for brake circuits or wheel brake circuits, so a J sensor could be among those. Bosch Motorsport's EBS illustrates per-channel fault flags: internal axle pressure, internal master cylinder pressure and the external caliper and master cylinder sensors each have their own bit. GM's 2019 EBCM does not separate an open from a short to voltage at all; both end up as open or shorted high above 95.24 % of supply. So check plug, terminals and harness first, even if the stored code says high instead of open.
- What you may notice
- Brake system or ESC warning lamp on
- Pressure-controlled brake functions switched off
- Likely causes
- LikelySpread or corroded terminal in the sensor connector
- PossibleConductor interrupted between sensor and control unit
- RareOpen circuit inside sensor J
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.