P268F: Cylinder 4 Injector Data Incompatible

What it means

The flow calibration data programmed for cylinder 4 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 a separate flow calibration entry for each injector. P268F flags incompatible data for the cylinder 4 injector, meaning its stored calibration does not match the format or injector type expected by the module software. This code singles out cylinder 4's data rather than the other injectors.

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
• Possible rough running or reduced power

How to diagnose it

1. Review freeze-frame data and related codes for rough running or reduced power that occurred with the cylinder 4 calibration fault.
2. Use the vehicle's cylinder layout to locate the cylinder 4 injector and read its calibration marking.
3. Compare that marking with the calibration entry stored for cylinder 4, looking for a wrong code or cylinder assignment.
4. Check that the cylinder 4 injector type matches the engine application and is compatible with the module software.
5. Program the correct cylinder 4 data using the manufacturer's procedure, clear the code, and confirm it stays cleared.

Common fixes

• Correct the calibration entry for the cylinder 4 injector.
• Fix any injector code entered under the wrong cylinder.
• Complete the required injector coding or learning procedure.
• Replace an incompatible cylinder 4 injector with the correct application.

Can I keep driving?

If there is no severe roughness or power loss, drive gently and avoid high loads until the cylinder 4 data is corrected. The mismatch may cause poor running or reduced power and can affect emissions.