Well, I just joined the P0299 club. I was able to pull my trailer the last 100 miles to my destination with the light on, and took it to the dealer near where I am at. The mechanic (only factory diesel mech within over 100 miles), said he reset the computer, but light came back on. Earliest they can get into it was next week, and what parts may be needed, could be several weeks+. Computer updated to the latest, and drove back to where I am staying, and the light is off for some reason. I have an aftermarket air filter on it, that I changed about 1,000 miles ago, and it replaced the same brand that has been in for about 14K miles. I can't wait several weeks, 600 miles from home, so I will try and find a MOPAR air filter, put it in, and early next week, pull my 14.5K lb trailer home. Got a couple of good hills to climb (Ashville to Knoxville), so hopefully I will make it home.