P2348Cylinder 9 Pressure Sensor Circuit
- 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
- A cylinder pressure sensor, usually built into the glow plug of a diesel, reports the combustion pressure of one cylinder so the ECM can trim injection for it. P2348 is the general circuit code for the sensor of cylinder 9, meant for modules that do not split faults into low and high. No manufacturer documents this code publicly: the systems found so far sit on four-cylinder diesels – the GM-built 2.0 CDTI of the Saab 9-5 relies on the split low/high codes, VW's US 2.0 TDI its own P13CE series – and an engine with a ninth cylinder and such sensors is not documented. The text therefore relies on CARB's circuit-monitoring duty for input sensors and on the cylinder-1 analogue P0395. Wiring, connector and sensor are the suspects; the ECM simply stops combustion control for that cylinder.
- What you may notice
- Check engine light on
- Often no noticeable change in driving
- Possibly slightly harsher combustion noise
- Likely causes
- LikelySensor or glow plug connector of cylinder 9 loose or corroded
- PossibleReference, signal or ground wire damaged
- PossiblePressure sensor electronics faulty
- 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 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.