2015 GMC 3500 - odometer question

Does the odometer revert back to 0 at 100,000 miles ?

No it doesn’t

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Not counting tenths…
On an older 5 digit odometer yes, on the newer ones (for decades now) 6 digit odometers no they do not, you would have to hit 1,000,000 miles for it to start all over, unless there is a malfunction of some kind…

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