P2B1FCylinder 8 Injection Pulse Offset Exceeded Learning Limit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2B1F is the last code of the series: the offset learned for injector 8 has crossed the learning limit. Ford uses it on the 6.7 L V8 Power Stroke. For 2023–2025 F-Super Duty trucks, special service message 53896 links these codes to driving above 762 m; when symptoms are present the minimum fuel mass adaption of all cylinders is reset with FDRS, and if the fault persists, section 303-04 of the workshop manual takes over. The principle behind it is CARB's rule for diesel fuel feedback in (f)(4.2.4)(A)(iii): a fault once the control has used up its adjustment range. A GM patent on small-quantity learning describes the same idea with two codes per cylinder, one for negative and one for positive drift. P2B1E is the not-learned partner.
- What you may notice
- Malfunction indicator lamp on
- Slightly rough idle in some cases, otherwise normal running
- Likely causes
- LikelyAdaption skewed by high-altitude driving (Ford SSM 53896, reset with FDRS)
- PossibleInjector 8 worn or coked
- RareOutdated PCM calibration
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.