Sobo21

I have the same issue. 23 high country, iPhone 12/14. Ridiculous that something so simple and they can’t get this right. My 20 high country worked flawlessly with the iPhone 12.

Redwngr, Thanks for the clarification on the 500 mile countdown being real miles. I will have to see if the gauge is off so much and be more prepared when towing longer distances.

Towed my boat which should be around 6k pounds. Within 1 tank of fuel (I got crappy mileage of about 11 mpg for some reason) the DEF went from 3/4 to empty in this one tank. I got a def warning saying I had 1,000 miles, then within a 100 miles a new warning say 256 miles. Within 50 more miles it went to critically empty and starting counting down saying I had 500 miles until speed restricted. It was 1am, but I was able to find a place that had def; but as quickly as the def counter went down I wasn’t sure I could trust the last 500 mile counter. Anyone know what could cause def to be used so quickly? As a side note I towed the boat today 75 miles, got 14 mpg and the def gauge didn’t move. Makes no sense.

I have a 2020 High Country less than a week and it has happened three times. Took it in this morning and the dealer had no clue. Showed them this thread and specifically FknLeon’s solution above. Since they couldn’t duplicate they offered to order the part and replace. Interesting that they told me the part number above is a brand new number and appears to replace the previous part number. Hopefully this is the fix.