The contact owns a 2020 Ram 1500. The contact stated while the vehicle was parked, the contact noticed a burning odor around the exterior of the vehicle. The contact performed an inspection and determined that the burning odor was coming from underneath the vehicle. The vehicle was started, and an error message was displayed, instructing the contact to take the vehicle to the dealer within the next 200 miles. The vehicle was taken to the dealer where it was diagnosed with a fractured diesel exhaust fluid (DEF) system. The contact was informed that the DEF system needed to be replaced. The vehicle was not repaired and remained at the dealer for further additional diagnostic tests. The manufacturer was not made aware of the failure. The failure mileage was approximately 40,000.