P235ECylinder 11 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
- With P235E the signal of the cylinder 11 combustion pressure sensor is too low, typically close to zero. No manufacturer documents this code, as twelve-cylinder engines with pressure sensors are not described publicly; the analogue is P0397 for cylinder 1 in Saab's 9-5 diesel, where a low signal must persist beyond 2 s with the engine running before the Type B code is logged. The first check there concerns the supply: 4.8 to 5.2 V on the reference terminal with ignition on; less voltage means the reference is interrupted or shorted to ground. Across reference and low reference of the plug itself, 3 to 12 Ohm are expected. A signal wire chafed through to the cylinder head also drags the input down. With bank-wise numbering the plug sits between cylinders 10 and 12, so their harness branches deserve a look too.
- What you may notice
- Warning lamp after the second faulty trip
- Peak pressure of cylinder 11 shown as zero
- Likely causes
- Likely5 V reference interrupted or shorted to ground
- PossibleSignal wire chafed through to ground
- PossibleSensor glow plug outside its 3–12 Ohm specification
- 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 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.