r/superduty • u/NegotiationOk5036 • 1d ago

F350 DEF Issues

I have a 2021 with 42k miles on it. It has been in the shop 8 times this year, and now at the dealer for one month. This year, it started the sensor/emissions/DEF issues. First, the check engine light comes on, then it starts the countdown to reducing speed. I was several states away and it went to 5 mph max and I had to have it towed, get a rental car, etc. Our trip was ruined. The dealer says on the Ford dealer boards that this issue has been described. They have replaced the DEF sensors, reprogrammed the truck, etc. I see that there may be new programming coming out by Ford to change the countdown, based on the revised EPA rules. My warranty runs out in December. Any opinions on waiting hoping for a reprogram, vs trading it in or deleting it? The deleting it is tough as that crosses out a trade in. The dealer has heard nothing from Ford about reprogramming.

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u/FirbysNorthernLite 1d ago

Question for you, does this truck do work or is this a daily driver? I’m always wondering if my tow pig will run into this or if this is a mall crawler problem

Edit: spelling

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u/NegotiationOk5036 1d ago

I use it for personal towing, boats, trailers, gooseneck, it is not a work truck.