Powertrain, generic (extended)

P2359 Cylinder 10 Pressure Variation Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2359 means the pressure trace of cylinder 10 changes too little: the build-up through compression and combustion is flatter than the ECM expects. No manufacturer documents this code for cylinder 10. Saab's 9-5 diesel lists the cylinder-1 analogue P039C with three sub-types, 00, 01 and 02, and counts it as a signal performance fault that reacts after 0.2 s out of range; what separates the sub-types is not explained there. BorgWarner's sensor glow plug passes the pressure through a flexible heater rod onto a measuring diaphragm, so a rod jammed by carbon or a stiff diaphragm flattens the curve. A cylinder with hardly any compression looks the same. In a V10 firing 1-6-5-10-2-7-3-8-4-9, as Ford's 6.8 L and Audi's 5.2 do, cylinder 10 is the fourth to fire.

Likely causes

Heater rod stuck in carbon, pressure no longer reaches the diaphragm
Sensing element has lost sensitivity
Cylinder 10 builds up hardly any pressure

Symptoms

  • Check engine light on
  • Engine behaviour usually unchanged

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–550
Time1–3.5 h

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

Parts involved

cylinder pressure sensor glow plugsensor wiringengine control modulefuel injector

Related codes

P235AP2356P2353P234FP2363P039C

References: saabwisonline.com, borgwarner.com, en.wikipedia.org, audi-mediacenter.com.