P2348 code meaning
Cylinder 9 Pressure Sensor Circuit
Powertrain system Generic code P23xx codes Check engine light
What P2348 means
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.
P2348 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2348
- Check engine light on
- Often no noticeable change in driving
- Possibly slightly harsher combustion noise
Common causes of P2348
- Most likelySensor or glow plug connector of cylinder 9 loose or corroded
- PossibleReference, signal or ground wire damaged
- PossiblePressure sensor electronics faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder pressure sensor glow plugSensor wiringEngine control module
What each part of P2348 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 48 | The exact fault in that area. |
What to do next
- Note P2348 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2348
What does P2348 mean?
P2348 means "Cylinder 9 Pressure Sensor Circuit". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2348?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2348 fail an emissions test?
Yes, it can. P2348 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2348 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2348 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.