Powertrain, generic (extended)

P2B1A Cylinder 6 Injection Pulse Offset Not Learned

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2B1A reports that the pulse offset for injector 6 has not been learned. Public manufacturer sources do not name this code; on the 3.0 L V6 Power Stroke built by Ford, where cylinder 6 is the last one, Ford's summary lists only the exceeded-limit code P2B1B. CARB explains why such learning exists in diesel engines: since 2010, sections (f)(4.2.2) and (f)(4.2.3) demand checks that the right fuel quantity arrives at the right crank angle, and where no failure could push emissions over the threshold, reaching the control limits serves as the criterion instead. An unlearned offset means that pilot quantities on cylinder 6 rest on nominal data only. Few symptoms beyond the lamp are to be expected; the cure is completing the learn under suitable driving, then checking injector 6 if it never succeeds.

Likely causes

Learn for injector 6 still pending after a reset or parts replacement
Mostly short trips with a cold engine, so the learn rarely starts
Injector 6 delivering so erratically that no value can be fixed

Symptoms

  • Warning lamp
  • Perhaps slightly harder combustion noise at idle

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,500
Time0.3–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector cylinder 6engine control module

Related codes

P2B1BP2B18P2B1CP02D6P02D7P0278

References: law.cornell.edu, fordservicecontent.com.