Radiator fan relay
Pop open the lid to the relay and fuse center, should be an imprint of fuse/relay layout. If not, consult your owner's manual, I assume it being a 2015 you still have one.
They should have a recall on the fan's failure. I have 57,000 mileage and sometimes fan stops or doesnt turn fast... same thing on my friend's Ram Promaster city exact sam vehicle he has less than 30,000. And I see plenty of complaints about the same exact issue online... RECALL RAM PROMASTER CITY OVERHEATING DUE TO RADIATOR FAN FAILURE!
This should covered by your warranty depending on mileage. Fixed the relay on mine after a P0481 dtc code. Cleared the code for about 50 miles and then my cooling fan melted right off the fan motor! Stuck with the same dtc now. Beware! I believe some of thes fans are indeed defective. Fan failed at under 15k miles.
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