Powertrain, generic (extended)

P232C Cylinder 11 Fuel Injector A Offset Learning At Max Limit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P232C is the upper-limit partner of P232B for injector A in cylinder 11. The small-quantity learning has found that this injector needs far more energizing time than the nominal map to produce the expected torque pulse, and the stored correction has hit its maximum at one or more rail pressure levels. Typical reasons are coking, wear or a sticking needle, so the injector delivers too little or opens late. GM's 2018 diesel tables describe the logic for cylinders 1 to 8: every new learned value is checked, the saturation status is kept per pressure level in non-volatile memory, the code sets if any level is saturated, and it is Type B (MIL after two trips). CARB requires such a fault when a fuel feedback has run out of authority. Only twelve-cylinder diesels have a cylinder 11; no maker publishes P232C.

Likely causes

Injector of cylinder 11 coked, worn or sticking (delivers too little)
Injector correction code missing or wrong after replacement
Poor fuel quality or contamination promoting deposits
Disturbed crankshaft speed signal

Symptoms

  • MIL on after two trips
  • Rough idle or uneven running at low load
  • Possibly harder starting or more smoke

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,500
Time0.5–5 h

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

Parts involved

fuel injector cyl 11injector wiring cyl 11injector learning strategy

Related codes

P232BP232EP02DFP0211P01DFP0311

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.