Powertrain, generic (extended)

P2C5A Cylinder 5 Fuel Injector B Offset Learning At Min Limit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2C5A can only occur on engines with at least five cylinders and indicates that cylinder 5's injector B has had its learned offset pulled down to the lower bound. The control has removed as much opening time as it may, yet the cylinder still gets more fuel than intended from this valve. On V engines with Ford numbering cylinder 5 opens bank 2; GM numbering puts it on bank 1. Candidates are a dripping valve, a part with too high a flow rating after a repair, or fuel pressure that the model underestimates. No manufacturer documents P2C5A publicly, and Volvo's bulletin for this code family covers only cylinders 1 to 4. CARB's rule 1968.2 (e)(6.2.2) calls for detection once an adaptive correction has used up its range.

Likely causes

Injector B of cylinder 5 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 5
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 5ecm

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