P268E: Cylinder 3 Injector Data Incompatible

What it means

The flow calibration data programmed for cylinder 3 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 relies on individual injector calibration data to account for fuel-flow differences among cylinders. P268E identifies a mismatch between the expected format and the data for the cylinder 3 injector. A wrong injector family or incompatible calibration format can trigger the fault.

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. Check freeze-frame data and related codes for signs of rough running or reduced power linked to the calibration fault.
2. Identify the cylinder 3 injector from the vehicle's cylinder layout and inspect its label or marking for the calibration code.
3. Compare the injector's code with the stored cylinder 3 entry, checking for a typing error or data assigned to another cylinder.
4. Verify that the cylinder 3 injector is the correct type for the engine and compatible with the installed module software.
5. Use the manufacturer's procedure to program compatible cylinder 3 data, then clear the code and check whether it returns.

Common fixes

• Correct the stored calibration data for the cylinder 3 injector.
• Fix a cylinder-position mix-up in the injector entries.
• Complete the required injector coding or learning procedure.
• Replace an incompatible cylinder 3 injector with the correct application.

Can I keep driving?

If the engine runs smoothly, limit driving to gentle trips until the cylinder 3 data is corrected. Rough running or reduced power can worsen, and incorrect fueling may affect emissions.