Chrysler vehicles 2018- now require the 12+8 cable to clear DTCs and to add keys. Here we successfully added a new key fob with Autel IM508 XP400 and autel 12+8 cable for Dodge RAM 3500 year 2018 with secure gateway module (SGM). Program key in auto mode.
Go to Dodge 3500 key programming menu, IM508 asks to hook up a Chrysler FCA 12+8 adapter
We’ve got that connected right there behind the stereo
Turn the ignition off and turn on the emergency flashers