D max and tire size??

[H1Chester]

Curious if this is still the same story one year later?

I asked a service rep at the dealer a few weeks ago and was told it was not possible to recalibrate the speedometer.

 

[steiny93]

Here is a tech link article that says GM dealers should check for an update: https://gm-techlink.com/?p=15317

Here locally, both GM and Chevy dealers have fairly large accessory businesses which install larger tires / lifts etc. The GMC dealer put larger BF AT's on my wife's Denali and the Chevy dealer put 35's on my FIL's ZR2. I can't believe the dealers didn't adjust the speedo's. The ZR2 had to have been calibrated as at 80mpg the truck vs Android Auto would be 6 mph off if it wasn't.