Going home after 3 months of riding around our great country. Towing a 5th wheel about 14,000. 200 miles from home check engine light comes and a message . Service DEF see dealer. Fine will do . A min later new message will derate to 5 mph in 150 miles . When you have 200 more miles to go... not good . When the 125 warning came up I looked for a wide spot to park. Got out the scanner hooked it up and prayed it was a glitch and I could clear it. Code came up , cleared it and it stayed gone. I had 3/4 tank of DEF at the time . I highly recommend carrying one , given all the electronics in these trucks. They can save your bacon ! Also had dealer do the SCR upgrade yesterday. Guess I can sleep easier knowing that Big Whitey is not fouling the air. I miss the rolling smoke days.


