Powertrain, generic (extended)

P2C5C Cylinder 6 Fuel Injector B Offset Learning At Min Limit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2C5C reports that the injector B offset for cylinder 6 has been learned down to its minimum. In practice the most telling check is the learned value itself: a scan tool that shows the offsets of all B injectors makes one outlier obvious. For an overdelivering valve a pressure-hold test of the rail after shut-off helps, since a dripping injector lets pressure fall faster and may leave a fuel smell or a long hot start. On in-line sixes cylinder 6 is the last one on the rail; on V6 engines its bank depends on the maker's numbering. No manufacturer documents P2C5C publicly; Volvo's injector B bulletin stops at cylinder 4. Under section (e)(6.2.2) of CARB's 13 CCR 1968.2 the exhausted correction counts as a fault.

Likely causes

Injector B of cylinder 6 leaking at the seat and adding fuel after closing

Replacement injector of a different flow rating or not matched to the engine software

Old learned values not reset after injector or software work

Supply pressure on this injector set higher than the model assumes (regulator)

Symptoms

Check engine light
Often nothing else noticeable
Long hot start or rough first seconds, possibly misfire on cylinder 6
Possibly fuel smell or higher consumption

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€0–1,200

Time0.5–5 h

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

Parts involved

fuel injector b cyl 6ecm

References: law.cornell.edu, patents.google.com, patents.google.com.