P2B17Cylinder 4 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
- P2B17 is set when injector 4's learned pulse offset goes past the allowed band. For the 6.7 L engine in 2020–2022 F-Super Duty trucks Ford saw this after fuel system work: stored learned values no longer matched the new parts. Special service messages 50646 and 50816 prescribe a relearn rather than a module swap – idle for at least six minutes with coolant at 75 °C or more and exhaust temperature EGT12 at 245 °C (pickups) or EGT13 at 230 °C (chassis cabs), then clear the code and retest; a new PCM is not needed. If P2B17 returns after that, a worn or leaking injector 4, a contribution fault (P0272) or a rail pressure problem remain the candidates. Ford's summary sets the code when the measured energising time misses the target by 156 µs downward or 254 µs upward.
- What you may notice
- Check engine light shortly after a fuel system repair
- Usually unchanged driving behaviour
- Likely causes
- LikelyOld learn values after fuel system work, cleared by a warm idle relearn (Ford SSM 50646/50816)
- PossibleInjector 4 worn or leaking internally
- RareRail pressure deviating from target during the test injection
- 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.