These are the steps to calibrate it. You did this and are still getting the code? The routine that it refers to is one of the tools that you can perform and it will calibrate.
1. Inspect entire Intake Air System and exhaust system checking (including turbo seals) for leaks. If leaks are found, repair as necessary; go to step 2.
2. Connect DDDL 7.x.
3. Start the engine and bring coolant temperature above 140°F/60°C.
4. Execute the Air Mass Adaptation Service routine.
If you are following this and the calibration is still not going through, then update the software on the truck and it will auto calibrate that way. I've had to push a few through in that manner.
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