Replace the EGR cooler. I guarantee from the description you provided that it's the EGR cooler. I've had 3 or 4 replacement (honestly have lost count) on my 2015 with 220,000miles. Luckily all but 1 were covered under warranty.
my 2015 with 220,000miles has had 3 EGR coolers replaced. Most recently in August 2024. The truck overheated, the heater failed to blow warm air and the scent of coolant was present. The EGR design is terrible. The dealer ordered the replacement EGR only to find out it was defective as it...
I have a 2015 Laramie 4x4 Ecodiesel (without 4 corner airbag suspension) with stock tires measuring 275-60/R20. Which size front leveling kit will truly bring the truck level, all while only utilizing the stock tires? Thank you.