Powertrain, generic (extended)

P268D Cylinder 2 Injector Data Incompatible

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P268D concerns the stored flow correction for the injector in cylinder 2. In GM's 2016 four-cylinder diesel table (16OBDG04) the test runs with ignition on and passes once the end-of-line injector adjustment (EIA) value has been written via DID $61; a missing value only counts as a failure when the manufacturer enable counter is zero, i.e. on a finished production controller. The code is Type A there and in GM's 2020 V8 diesel table. Where cylinder 2 physically sits depends on the maker's numbering. Ford's 2023 diesel summary also uses P268D. CARB wants the stored code to point to the injector with the wrong compensation, hence one code per cylinder.

Likely causes

Adjustment value of the cylinder 2 injector not programmed after replacement
Injectors moved between cylinders without updating codes
Programming session aborted (voltage drop, communication loss)

Symptoms

  • Check engine light on
  • Slight misfire feel or noise from cylinder 2

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–250
Time0.3–1 h

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

Parts involved

fuel injector cyl2control module

Related codes

P268CP268EP2696P0202P02EF

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.