What it means
The controller has not learned or received the required fuel injector calibration data. The code does not specify a particular calibration format or injector coding system.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Some fuel systems store injector-specific calibration data so the control module can account for small differences in injector delivery. P268A indicates that the required calibration has not been learned or programmed. The module may therefore lack the correct data for one or more injectors, especially after an injector replacement.
Common causes
Most likely first.
- Injector calibration codes not entered after replacement
- Wrong codes entered for the wrong cylinder positions
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
How to diagnose it
- Scan for related injector or programming codes and review freeze-frame data for rough idle, misfire, or fuel-use symptoms.
- Confirm from service records which injectors were replaced and whether calibration entry was completed afterward.
- Compare the stored calibration entries with the codes on the installed injectors and verify that each code is assigned to the correct cylinder position.
- Check that the installed injector types match the engine application and that the calibration format is accepted by the control module.
- Use the manufacturer's procedure to enter or relearn the correct injector data, then clear codes and check for a return and smooth operation.
Common fixes
- Enter the correct injector calibration codes in their proper cylinder positions.
- Complete the required injector learning or programming procedure.
- Correct a code entered for the wrong cylinder.
- Fit an injector compatible with the vehicle's software and calibration requirements.
Can I keep driving?
If the engine runs smoothly and has no fuel smell or smoke, a short, gentle drive may be reasonable, but arrange correction soon. Miscalibrated fueling can worsen rough running, fuel consumption, exhaust smoke, or 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.