P2B11Cylinder 1 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
- P2B11 says the learned small-quantity correction for injector 1 has drifted beyond what the engine control may apply. Ford documents the code for its 3.0 L and 6.7 L Power Stroke diesels under Zero Fuel Calibration: the PCM fires a tiny test injection, compares the energising time that produced a measurable effect with the target stored for that injector and sets the code when the result is at least 156 µs too short or 254 µs too long. Ford TSB 18-2015 for the 2017 F-Super Duty 6.7 L ties P2B11 and its siblings to a fuel knock at idle caused by wrongly learned injector timing; the fix was resetting the high-pressure side, the minimum fuel mass adaption and the crank sensor learn, then reprogramming the PCM. P2B10 is the not-learned state of the same injector.
- What you may notice
- Check engine light
- Diesel knock at idle, sometimes together with balance code P0263
- Likely causes
- LikelyIncorrectly learned injector values in the PCM (Ford TSB 18-2015, reset and reprogramming)
- PossibleInjector 1 worn or coked so its opening behaviour has really shifted
- RareDisturbed crankshaft speed signal falsifying the learn result
- 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: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.