P2366 code meaning
Cylinder 12 Pressure Sensor Circuit
Powertrain system Generic code P23xx codes Check engine light
What P2366 means
P2366 is the general circuit code for the combustion pressure sensor of cylinder 12; it does not tell whether the signal sits too low or too high. Twelve is the highest number on a V12 or W12. Whether a maker counts bank by bank or along the crankshaft, number 1 is normally the front cylinder, which places 12 at the opposite end of the engine. No twelve-cylinder engine with pressure-sensing glow plugs is publicly documented, so no manufacturer describes P2366; CARB's demand for circuit continuity checks and the cylinder-1 code P0395 frame it. A 2014 Volkswagen bulletin for its 2.0 TDI advises a push-and-pull test of the plug connector before any part is replaced, since a poorly seated connector is often the real culprit. The engine usually runs as before.
P2366 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 P2366
- Check engine light on
- Pressure reading for cylinder 12 missing or fixed in live data
Common causes of P2366
- Most likelyGlow plug connector not fully latched or loose
- PossibleDamaged wire in the harness branch to the rearmost cylinder
- PossiblePressure-sensing glow plug 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 P2366 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. |
| 66 | The exact fault in that area. |
What to do next
- Note P2366 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 P2366
What does P2366 mean?
P2366 means "Cylinder 12 Pressure Sensor Circuit". P2366 is the general circuit code for the combustion pressure sensor of cylinder 12; it does not tell whether the signal sits too low or too high. It is a generic code, so it means the same on every make.
Is it safe to drive with P2366?
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 P2366 fail an emissions test?
Yes, it can. P2366 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 P2366 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2366 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.