My 2019 ram 1500 started showing an intermittent warning light on the dash that said check check trailer brake, although I was not towing anything. I continued on my 20 minute commute and parked the vehicle to which point I noticed smoke towards the back of the vehicle. I inspected to see a small fire that apparently had started at the trailer tow module that had shorted and ignited the insulation and surrounding plastics. I was able to extinguish the fire with minimal damage to the truck, mainly the plastic paneling and the wiring and associated components were damaged. I'm reporting this because a vehicle fire is a significant safety concern and I'm probably not the first to have had this happen. I have made no aftermarket adjustments to my towing system and I've only owned the vehicle approximately over a year. The vehicle has about 83,000 miles on it currently.