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.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Cylinder 12 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Check engine light on
- Pressure reading for cylinder 12 missing or fixed in live data
Most likely causes
- Glow plug connector not fully latched or loose
- Damaged wire in the harness branch to the rearmost cylinder
- Pressure-sensing glow plug faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2366 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 3: Ignition and misfires
- 66: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2366?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P2366?
The most common causes are: glow plug connector not fully latched or loose; damaged wire in the harness branch to the rearmost cylinder; pressure-sensing glow plug faulty.
Related codes
- P2367Cylinder 12 Pressure Sensor Circuit Range/Performance
- P2368Cylinder 12 Pressure Sensor Circuit Low
- P2369Cylinder 12 Pressure Sensor Circuit High
- P236ACylinder 12 Pressure Sensor Circuit Intermittent/Erratic
- P235CCylinder 11 Pressure Sensor Circuit
- P2352Cylinder 10 Pressure Sensor Circuit
- P0395Cylinder 1 Pressure Sensor Circuit
Sources
- law.cornell.edu: 13 CCR 1968.2
- static.nhtsa.gov: MC 10120324 9999
- en.wikipedia.org: Firing order
- saabwisonline.com: dtc p0397 p0398 p03a1 p03a2 p03ab p03ac p03b5 or p
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.