P268D: Cylinder 2 Injector Data Incompatible

What it means

The flow calibration data programmed for cylinder 2 injector does not match the format expected by the controller software.

At a glance

• Usually lights the check-engine light

How it works

The control module uses injector-specific flow calibration to account for delivery differences between cylinders. P268D points specifically to incompatible calibration data for the cylinder 2 injector. The stored data format or injector family does not match what the module software expects for that cylinder.

Common causes

Most likely first.

1. Replacement injector has different part number than software expects
2. Calibration code format does not match controller version

Symptoms

• Check-engine light
• Rough running
• Reduced power

How to diagnose it

1. Scan for related injector or misfire codes and note in freeze-frame data whether rough running or reduced power was present.
2. Identify the cylinder 2 injector from the vehicle's cylinder layout and record the calibration code marked on it.
3. Compare the cylinder 2 injector code with the data stored for cylinder 2, checking for a mistyped code or a code assigned to another cylinder.
4. Confirm that the installed cylinder 2 injector type is supported by the engine and control module software.
5. Enter compatible cylinder 2 calibration data using the manufacturer's procedure, then clear the code and check engine operation.

Common fixes

• Correct the stored calibration entry for the cylinder 2 injector.
• Reassign an injector code that was entered under the wrong cylinder.
• Complete the required injector coding or learning procedure.
• Replace an incompatible cylinder 2 injector with the correct application.

Can I keep driving?

If the engine runs evenly, a gentle short drive may be possible, but avoid heavy loads until the cylinder 2 calibration is corrected. The mismatch can cause rough running or reduced power and may affect emissions.