Powertrain, generic (extended)

P2366 Cylinder 12 Pressure Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

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.

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

Symptoms

Check engine light on
Pressure reading for cylinder 12 missing or fixed in live data

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–600

Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cylinder pressure sensor glow plugsensor wiringengine control module

References: law.cornell.edu, static.nhtsa.gov, en.wikipedia.org, saabwisonline.com.