P2B14Cylinder 3 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
- P2B14 tells that no offset has yet been learned for injector 3. No carmaker publishes this code for a specific engine, and the GM and Ford tables checked do not contain it. A GM patent on fast learning of diesel injector corrections shows why such a learn can take long: corrections are kept per injector and per rail pressure level, so a six-cylinder with four pressure levels needs 24 learned cells, each filled only during suitable fuel cut-off phases. The patent's answer is to extrapolate from one measured pressure to the others. Until the cells for cylinder 3 are complete, small pilot injections on that cylinder run without their individual correction. Under CARB (f)(4.2.4)(A)(i) such feedback must start within a set time; P2B15 is the out-of-limit partner.
- What you may notice
- Warning lamp, driving behaviour mostly unchanged
- Slightly uneven idle in some cases
- Likely causes
- LikelyLearn not yet completed for all rail pressure levels of injector 3
- PossibleInjector 3 or control unit recently replaced without completing the learn
- RareRail pressure not holding steady enough 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.