Today General Motors has told dealerships to halt sales of certain crossovers. The order comes as the company has discovered that the EPA fuel economy ratings on the 2016 Buick Enclave, Chevrolet Traverse and GMC Acadia are overstated by 1-2 mpg. GM claims the cause is a data transmission error, according to a report broke by Automotive News.

Thus far GM has not detailed the exact reasoning for the overstatement other than the admission it was an error. Regardless of the cause, the Monroney (window sticker) on all-wheel-drive versions of the crossovers currently show EPA ratings of 17 mpg city and 24 mpg highway. According to the report, the correct ratings are 15 mpg city and 22 mpg highway. The EPA’s website shows the correct ratings.

Oddly enough the EPA website also reveals that the 2015 model year crossovers were rated at 16 mpg city and 23 mpg highway when equipped with all-wheel-drive. According to GM’s own online order guide, there were no notable mechanical changes to any of the crossovers between the 2015 and 2016 model years. Therefore it isn’t immediately clear as to why the sudden drop in mpg. [EDIT – GM has told Automotive News that there were technical changes on the crossovers between 2015 and 2016 model year.]

According to the report, GM is in the process of generating new window stickers for the nearly 60,000 impacted crossovers. The new windows stickers will allegedly begin arriving at dealerships Saturday. Once the corrected Monroney is affixed to the vehicle, the vehicle can then be sold.