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The only way to stop it is to delete, tune, and loose your warranty. Spend some time reading the diesel supplement that came with your owners manual. It will explain everything.
The filter cleaning is the DPF burning off it collected particles. It will drop your mpg when it occurs and should occur every 200-500 miles depending on your driving habits. It should last 10-20 minutes of steady driving each time. There is no way to prevent it from starting and no control of it unless you got an option on a lower trim model. If you turn off your truck before it's done, it may start up again when you start up depending on how much it cleaned before. At some point, you'll have a drive to clean warning pop up if the automatic cleaning hasn't been enough. At that time you need to take a 20 minute drive to clean the DPF so you don't harm it.
2014 Tuxedo Black, 6.7L Lariat FX4, Nav, 20" aluminum wheels