P2368 code meaning
Cylinder 12 Pressure Sensor Circuit Low
Powertrain system Generic code P23xx codes Check engine light
What P2368 means
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.
P2368 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2368
- Warning lamp after two trips with the fault
- Peak pressure of cylinder 12 stuck near zero
Common causes of P2368
- Most likelySignal wire shorted to ground
- Possible5 V reference open or shorted to ground
- PossibleSensor electronics in the glow plug head failed low
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 P2368 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. |
| 68 | The exact fault in that area. |
What to do next
- Note P2368 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 P2368
What does P2368 mean?
P2368 means "Cylinder 12 Pressure Sensor Circuit Low". P2368 is stored when the voltage coming from the cylinder 12 pressure sensor stays below its lower limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2368?
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 P2368 fail an emissions test?
Yes, it can. P2368 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 P2368 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2368 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.