Powertrain, generic (extended)

P2C5E Cylinder 7 Fuel Injector B Offset Learning At Min Limit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2C5E belongs to cylinder 7 and therefore to engines with at least seven cylinders, in practice V8s. It is stored when the learned offset of injector B has been driven to its floor: the valve gives more fuel than the model predicts even at the shortest permitted command. On Ford-numbered V8s cylinder 7 is on bank 2, on GM-numbered ones on bank 1, so a rich fuel trim for system B on the matching bank (P2BF1 or P2BF3) supports the finding. Leaking seats, a wrongly rated replacement valve or excess rail pressure are the usual suspects. No manufacturer documents P2C5E publicly; Ford's 2020 to 2025 OBD summaries for its dual-injection V8 do not list it either. It falls under CARB 1968.2 (e)(6.2.2).

Likely causes

Injector B of cylinder 7 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 7
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 7ecm

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