Powertrain, generic (extended)

P2357 Cylinder 10 Pressure Too Low

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2357 is not about the wiring: the pressure measured or modelled for cylinder 10 itself is below expectation while the sensor circuit tests fine. No manufacturer publishes this code, and the cylinder-1 counterpart P039A is equally undocumented. On a V10 such an evaluation also has to know when low pressure is intended – Audi's R8 V10, for instance, cuts injection and ignition on a whole bank under light and moderate load. Outside such phases, too little pressure suggests weak combustion from an injector delivering short, compression lost through a valve or worn rings, gas escaping past the glow plug seal, or a sensor reading low. Expect rough idle, more smoke and higher consumption; the cylinder 10 misfire code P0310 frequently comes along.

Likely causes

Injector of cylinder 10 delivering too little fuel

Compression loss from valve leakage or worn rings

Combustion gas leaking past the glow plug seal

Pressure sensor reading too low

Symptoms

Check engine light on
Rough running, mainly at idle
More smoke and higher fuel consumption

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–2,800

Time1–9 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

References: law.cornell.edu, audi-mediacenter.com, borgwarner.com.