Powertrain, generic (extended)

P2B14 Cylinder 3 Injection Pulse Offset Not Learned

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Learn not yet completed for all rail pressure levels of injector 3
Injector 3 or control unit recently replaced without completing the learn
Rail pressure not holding steady enough during the test injection

Symptoms

  • Warning lamp, driving behaviour mostly unchanged
  • Slightly uneven idle in some cases

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 3engine control module

Related codes

P2B15P2B12P2B16P02D0P02D1P0269

References: law.cornell.edu, patents.google.com.