I have a 2016 cascadia evolution and my Def light is blinking and check engine light is on also truck won't go over to 55 mph can anyone help
17 Cascadia my Def light is blinking & check engine light is on
Discussion in 'Freightliner Forum' started by Oldschooltrucker2016, Oct 15, 2021.
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The computer it limiting truck speed and probably power so you go to get the DEF problem fixed. I think you can go 500 miles before it limits truck to 5MPH.
Something is wrong with DEF system. I had 2011 truck that did that. It stared as Bad DEF quality. It could be bad sensor or something else. -
This is one reason I recommend buying the DDDL software and the NextIQ interface. A forced regen will sometimes clear the bad quality DEF code so you aren't derated, even if you haven't fixed anything yet. It might derate again during the next driving regen, but you'll get down the road until then. With DDDL you can also set the parameters that determine what happens during a derate. You can't stop a derate from happening altogether, but you can change the derate speeds from 55/45/5 to something like 95/94/93. That way you just get the blinking light until you fix the problem. There is also a derate acceleration limit that defaults to 0.5 kph per second (2016 Cascadia DD15). You can set that to 100 or something so you don't feel it.LoneRanger and jsnell Thank this. -
I have a 17' Cascadia with DD15 and once had the exact same thing happen after a dpf cleaning. The truck went maybe 10 miles at 55 then derated to 5 mph. Had to get towed to Amarillo Freightliner shop . Shop informed me dpf sensor had failed probably due to dpf cleaning.
Apparently Detroit doesn't recommend dpf cleaning only replacing filter. -
Yes, it was my def light that was on along with amber engine light.
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