P2B16Cylinder 4 Injection Pulse Offset Not Learned
- 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
- P2B16 indicates a missing learned pulse offset for injector 4. Public manufacturer material does not tie it to any engine; Ford's published diesel monitor and its bulletins use only the exceeded-limit partner P2B17. Why the learn matters is set out in a Bosch patent: pilot injections are kept as small as possible, and if tolerances mean the injector does not open at all, combustion becomes noticeably louder. A typical trigger for a not-learned state is a fresh start of the learn – after replacing injector 4 or the engine control unit, or after a scan tool reset of the minimum fuel quantity adaption, a step Ford prescribes in TSB 23-2076. Clearing the code before the vehicle has seen suitable driving rarely helps; the conditions for the learn must occur first.
- What you may notice
- Warning lamp
- Louder combustion noise, especially at idle
- Likely causes
- LikelyInjector 4 or PCM replaced, or adaptions reset, and the learn not yet completed
- PossibleLearn conditions (warm engine, fuel cut-off) rarely reached
- RareInjector 4 not opening on minimal pulses at all
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.