C063FBrake Pressure Sensor J Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The signal of brake pressure sensor J is stuck below its lower limit. Ipgate's double-stroke-piston patent fits one pressure sensor to each brake circuit and checks the delivered fluid volume against the pressure-volume curve of that circuit; such a circuit sensor is one possible J position, though no manufacturer confirms the letter. Denso defines 0–0.3 V as the low fault band and notes that a broken feed or signal line also lands there when the input has a pull-down. Saab/GM detects a ground short or open on the signal or 5 V reference after 0.1 s and then turns off ABS, traction and stability control for the rest of the ignition cycle. Usual suspects: a chafed signal wire, a shorted reference, a failed sensor element.
- What you may notice
- ABS, traction and stability warning lamps on
- ABS and ESC inoperative until the next ignition cycle
- Likely causes
- LikelyChafed signal wire touching ground
- Possible5 V reference shorted to ground
- PossibleBroken feed or signal wire pulled to 0 V by the module input
- RareFailed sensing element in sensor J
- 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.