Powertrain, generic (extended)

P2B1B Cylinder 6 Injection Pulse Offset Exceeded Learning Limit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2B1B concerns injector 6. On Ford's 3.0 L V6 Power Stroke it is the last cylinder the zero-fuel monitor checks, on the 6.7 L V8 the sixth of eight. The code means the energising time at which injector 6 starts to deliver has moved too far from its stored target, beyond the learn limit. Ford TSB 25-2262 superseded TSB 23-2076 with newer PCM software: driving above 762 m could leave wrong learned values, the engine might idle slightly rough, and Ford states that driveability and durability are not affected. The procedure is reprogramming PCM and TCM and then resetting the minimum fuel mass adaptions. Mechanical causes remain possible, so a code that persists after reflash and reset calls for a contribution check (P0278) and a test of injector 6.

Likely causes

PCM software learning wrong values at altitude (Ford TSB 25-2262)

Injector 6 drifted by wear or deposits

Adaptions not reset after an earlier repair

Symptoms

Malfunction indicator lamp on
Slightly rough idle, driveability otherwise normal

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–2,500

Time0.5–6 h

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

Parts involved

fuel injector cylinder 6engine control module

References: fordservicecontent.com, static.nhtsa.gov.