P2368Cylinder 12 Pressure Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2368 is stored when the voltage coming from the cylinder 12 pressure sensor stays below its lower limit. As the last cylinder of a V12 or W12, it has no publicly documented application, so Saab's 9-5 diesel code P0397 serves as the template. There, the scan tool shows peak combustion pressure in a normal band of 0 to 9,000 kPa; a signal wire touching ground or a missing 5 V reference pins the value at the bottom. In Saab's test an intact signal path jumps above 10,000 kPa once the plug is disconnected – a reading that stays low with the connector off therefore points to the harness rather than the sensor. Being a Type B code there, it needs two faulty trips before the lamp lights. The opposite case is P2369.
- What you may notice
- Warning lamp after two trips with the fault
- Peak pressure of cylinder 12 stuck near zero
- Likely causes
- LikelySignal wire shorted to ground
- Possible5 V reference open or shorted to ground
- PossibleSensor electronics in the glow plug head failed low
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.