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Fault code i c u 23 on a 2012 dd15 - Cars & Trucks

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Posted on Jan 02, 2017

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SOURCE: 2011 freightliner Cascadia with DD15. Fault code


Posted on Mar 26, 2011


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What causes low boost on Detroit engines 60series,dd13 dd15

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boost is produced as the exhaust turbine winds up from that extra heat / pressure produced from the extra fuel
loose intercooler hoses , cracked intercooler will loose that extra boost
so it could be from the fuel controller ( throttle position sensor) is not working properly, boost pressure being lost by holes in the system or-- from experience-- a problem turbo unit ( bent vanes on the compressor wheel from impurities hitting then at speed creating an excessive turbulence and slowing down the turbo action
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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

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