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Help 128 derate code


mcratchet1

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Def tank full ??? If the truck is standard try unpluging the speed pu on the trans this will get you to the dealer a little faster 5 mph it  is a bit ridiculous they have a derate set so low ! and dangerous if your on a freeway!

Edited by fjh
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We set up the manual trans trucks so that if the 5 mph derate happens they can unplug the speeding sensor and will only loose a small percent of power . We set the "engine speed at any error" to 2100 rpm. Normally it's set at 1400 rpm. Also if you don't have a laptop with"Tech Tool " on it , there is little you can do but go to the dealer

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5 hours ago, mcratchet1 said:

yes def tank is full, dealership is 100 miles away will it effect anything with the speed sensor unhooked? but im trying hard to avoid the dealership

Unfortunately chances are the def is not injecting properly and needs repair anyway its only a matter of time that the crystal build up will choke off the exhaust anyway ! if the speed sensor disconnect works bite the bullet and get it in there!

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