Powertrain, generic (extended)

P2369 Cylinder 12 Pressure Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2369 means the cylinder 12 pressure input reads above its upper limit. Like the rest of the cylinder-12 family, it is not documented publicly by any maker. On Saab's 9-5 diesel the matching cylinder-1 code P0398 is set after more than 2 s above the threshold and is evaluated once per operating cycle. An unplugged sensor drives the value past 10,000 kPa, so to the ECM an open signal or open low-reference wire looks the same as a short to voltage. Saab tells the cases apart with a fused jumper between signal and low reference: the reading should then drop below 50 kPa; if it stays high, the fault lies in the wiring towards the ECM, otherwise in the plug. While the code is active, the ECM has no usable pressure feedback from this cylinder.

Likely causes

Signal or low-reference wire open

Signal shorted to a voltage source

Glow plug sensor electronics outputting a fixed high value

Symptoms

Check engine light after the second trip
Cylinder 12 shows an impossibly high pressure 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: saabwisonline.com, law.cornell.edu.