mike wilbert Posted August 13, 2021 Share Posted August 13, 2021 checked codes found no communication with aftertreatment control module . checked power at battery and found power wire with 30amp fuse broken at terminal. now we have power at acm but not communicating with ecm. grounds are good. wiring looks good. all fuses check good. DEF gauge shows empty. we tested DEF sending unit that and is working. tryed gauge from another truck. could the loose power wire have spiked the acm ? Quote Link to comment https://www.bigmacktrucks.com/topic/67716-2013-leu-mp7-severe-derate-5mph/ Share on other sites More sharing options...
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