Same issue with ours that started at the 6-month maintenance plus software update (November 2018). Remote start stopped working after that. Check engine light came on. Dealer said we need to replace fuel injector. Check engine light was off for about a week or so then turned back on again. After driving a few days with it on, it turned off as we were driving to the dealer. Go figure! Anyway, happened again. Check engine light would turn on and off ao we brought it back in. Now they’re telling us we need to replace the catalytic converter that isnon backorder for a month! We have a 2018 SEL R-Line with less than 7k miles. Our suspicion from the very beginning of all these issues is that the software update messed it up. Our Atlas was perfectly fine before we brought it to for maintenance.