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It's kind of like "updating Windows" with Microsoft's latest service pack. It's an update to your truck's computer.
 

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a reflash is a calibraion change that the dealer performes on you ecm to give you the latest update just like updating your home pc. it is done to correct problems that arrise in previous program
 

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Does this need to be done regularly or only when problems are noted with the vehicle?
 

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Primarily when problems are experienced. Myself, I like to stay on top of things, but some (read as many) dealers are reluctant to do anything because of the potential for complaints of everything from decreased power to decreased mpg to speedo being suddenly off etc. In other words there is some potential for unlrelated things to be mistakenly blamed on the reflash...

To date I have yet to see a Dmax update that has had any negative impact on performance or driveability.
 
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