P268D code meaning
Cylinder 2 Injector Data Incompatible
Powertrain system Generic code P26xx codes Check engine light
What P268D means
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.
P268D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P268D
- Check engine light on
- Slight misfire feel or noise from cylinder 2
Common causes of P268D
- Most likelyAdjustment value of the cylinder 2 injector not programmed after replacement
- PossibleInjectors moved between cylinders without updating codes
- Less likelyProgramming session aborted (voltage drop, communication loss)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injector cyl2Control module
What each part of P268D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 8D | The exact fault in that area. |
What to do next
- Note P268D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P268D
What does P268D mean?
P268D means "Cylinder 2 Injector Data Incompatible". P268D concerns the stored flow correction for the injector in cylinder 2. It is a generic code, so it means the same on every make.
Is it safe to drive with P268D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P268D fail an emissions test?
Yes, it can. P268D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P268D to fix?
Difficulty: medium. A typical repair takes 0.3 to 1 hours of work. This is a job for a workshop.
Will P268D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.