Freightliner cascadia not cranking and starting Mcm Cpc Tcm not connecting with computer

2015 Freightliner cascadia , when plug in computer to diagnose fault codes , it doesn’t show any mcm cpc and tcm connected to computer, checked battery wiring and fuses than I end up finding bad wiring on Sam cab plug x19 . Tried yo bypass the starter relay it start the truck but truck shutdown even you turn key off , so had to fix it properly for customer. But if you oh v stuck somewhere you can pass the relay that shown in video with loop wire to make to your destination and fix it than . Hopefully they might save your day for someone. Have great holidays be safe everyone

[@TWR358]

Thank you for the insight.

[@robertovillalon2841]

Thanks for the info!

[@user-ws4pc5dh3q]

Thank you very much.

[@kevinm1379]

I’m having the same problem now was driving truck shut down with active breaking system unavailable towed it to yard put computer on it said cpc so I changed the cpc now it’s saying no communication with tcm and abs no gears on dash been at this for four days still can’t the problem

[@hilariochairez740]

Tnks that info

[@wenrahlan2514]

Wow nice

[@Unitedtruck295]

Thanks for the feedback to my work

[@I_Died_2_Weeks_Ago]

Deoxit D5 is the only hope for that truck. If that don't fix it then all new harness.

[@Unitedtruck295]

Yeah i actually suggest them to replace the harness for avoid problem in future

[@88miken36]

🎉🎉🎉🎉

[@ruvimmaksimchuk9488]

Was there a check light on the dash?Any code?

[@Unitedtruck295]

Yeah check light and codes were for mcm and cpc no communication codes and no start and when I plug in ddl it wasn’t showing mcm and cpc and tcm etc

[@Druidvasia]

Cascadia with cummins. Has a code for j1939 500k. No crank from the key. You can start it by shorting the starter. Help me guys

[@alongwang3582]

My wire harness has been checked in good condition. MCM Still no communication

[@ibrahimsalih5783]

What did you do to solve it i have the same issue thanks, says CPC4 diagnostics issue

[@ImParzelli]

Freightliner keeps this BS in there trucks for some reason. Theres no reason anything should affect a truck to start unless the starter is blown. Scam cadia i lost everything because of this.

[@hddm3]

Window leaking

[@ChrisMcCutcheon-wj2pp]

Junkiest truck ever built, dodge wiring harness, i own one, fixing to scrap the POS

[@Unitedtruck295]

Agree with that