What it means
The flow calibration data programmed for cylinder 1 injector does not match the format expected by the controller software. Calibration was applied for the wrong injector type or family.
At a glance
- Usually lights the check-engine light
How it works
The control module uses cylinder-specific injector flow data to account for how much fuel that injector delivers. P268C identifies incompatible calibration data for the cylinder 1 injector: the stored code or format does not match what the module software expects. The fault concerns cylinder 1's injector data, not a general injector circuit failure.
Common causes
Most likely first.
- Replacement injector has different part number than software expects
- Calibration code format does not match controller version
Symptoms
- Check-engine light
- Rough running
- Reduced power
How to diagnose it
- Scan for misfire and injector codes and review freeze-frame data for rough running or reduced power associated with the fault.
- Locate the cylinder 1 injector using the vehicle's cylinder identification information and read its installed identification or calibration code.
- Compare the cylinder 1 entry stored in the module with the code on that injector, checking for a transcription error or wrong cylinder assignment.
- Verify that the cylinder 1 injector type is compatible with the engine and module software version.
- Use the manufacturer's procedure to enter compatible cylinder 1 data, then clear the code and assess idle and power.
Common fixes
- Correct the calibration code stored for the cylinder 1 injector.
- Move a misassigned calibration entry to the correct cylinder position.
- Complete the required injector coding or learning procedure.
- Replace an incompatible cylinder 1 injector with the correct application.
Can I keep driving?
If the engine is running smoothly, drive gently and avoid heavy loads until the cylinder 1 data is corrected. Incompatible calibration can cause rough running or reduced power and may increase emissions.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.