Codes my 2012 freightliner cascadia is giving me fault 1 cab 33 spn 522108 fail 05 fault 2 chs 71 spn 520919 fail 05 fault 03 eec 61 spn 4364 fail 18 fault 04 eec 61 spn 3364 fail 02 fault 05 sys 58 spn 523318 fail 07 diag 05 and will not regen, check engine light on and service engine light on

SOURCE: 2012 freightliner cascadia DD15 fault code ECU 1... prior to the fault code the engine bogged down really bad and solid yellow and check engine light come on.

an answer from just answers reports this
ecu 1 fault means the engine ECM has an internal fault and needs to be replaced
most of the time with this code it is not the ECM itself but usually a wiring problem going to the ECm
there should be 2 fuses for the ECM either next to the ecm in plastic covers by a starter or in a plastic box
check all wiring going to and from the engine and battery grounds
especially the grounds
check for wires rubbed through and loose terminals
take it to a service dealer for a proper diagnosis as it costs money wasting time trying to find the fault yourself as a truck standing still is not earning it's keep