P2350 code meaning
Cylinder 9 Pressure Variation High
Powertrain system Generic code P23xx codes Check engine light
What P2350 means
P2350 is the opposite of P234F: the cylinder 9 pressure signal swings more than plausible, with peaks or steps that do not fit the engine's operating state. No manufacturer publishes the code for cylinder 9. The analogue in Saab's 9-5 diesel workshop data is P039D, labelled as excessive pressure variation for cylinder 1, set as soon as the signal is outside its window for over 0.2 s and treated as a signal performance fault of Type B. A noisy signal comes mostly from the electrical side – interference on an unshielded or chafed signal wire, poor ground, failing sensor electronics. Less often the combustion itself is uneven, for instance through an injector that dribbles after closing. CARB requires such rationality checks of input sensors. Drivers rarely notice anything beyond the MIL.
P2350 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2350
- Check engine light on
- Usually no noticeable symptoms
Common causes of P2350
- PossibleInterference or chafing on the sensor signal wire
- PossiblePoor sensor ground connection
- PossibleSensor electronics in the glow plug failing
- Less likelyInjector of cylinder 9 dribbling after closing
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 moduleFuel injector
What each part of P2350 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. |
| 50 | The exact fault in that area. |
What to do next
- Note P2350 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 P2350
What does P2350 mean?
P2350 means "Cylinder 9 Pressure Variation High". P2350 is the opposite of P234F: the cylinder 9 pressure signal swings more than plausible, with peaks or steps that do not fit the engine's operating state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2350?
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 P2350 fail an emissions test?
Yes, it can. P2350 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 P2350 to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P2350 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.