Gas Recirculation Valve (egr Valve) problems of the 2019 Nissan Titan

While towing a 30 foot 5th wheel trailer up a steep grade on i90 in washington state, the truck's engine abruptly slowed, and subsequent dashboard warning lights appeared. We were forced in to attempting a change of lanes to reach the shoulder. This was extremely difficult and traumatic, due to the steep road grade, abrupt slowing of our vehicle, fast moving upcoming traffic and the number of semi-trucks traveling in the right lanes. Because the speed limit in this area is 70 mph, most vehicles traveling at 80+ mph. But at the time when the truck started to fail, we were traveling at approximately 62 mph. This was an obvious and dangerous hazard to not only myself, but my family and other vehicles in the immediate area of traffic. Without warning or prior indication, our vehicle abruptly slowed down, which caused a great deal of vehicles following ours to quickly change lanes in order to avoid a collision with not only our vehicle/trailer, but other vehicles traveling and maneuvering around ours and other traffic. Once we were able to turn around and "limp" home(which in itself was extremely risky). I brought the truck for diagnostic testing at advantage Nissan or bremerton, wa. Upon testing, the fault was shown as an egr coolant or coolant reservoir fault(s). In researching, it is obvious this is a known historical safety issue or problem with Nissan's 2016-2019 cummins 5. 0 diesel engine equipped vehicles.