I’m a diesel mech in the Marine Corps and recently troubleshot and fixed a c12 with a no start condition. Truck was running fine the day prior and suddenly would not start. Engine would crank fine, good fuel pressure, all the injectors tested out fine, no engine codes, and the ECM was reading fine and no errors whatsoever in CAT ET. After about 2 days of trying everything I swapped an ecm from another c12 and bam the thing fired right up? The wiring to the ecm on prior to swapping was fine and tight and all the pins looked good, so in all I ordered a new ECM and since the old one was readible in CAT ET I backed up the injector trim files and flashed them to the new ECM as well as some other basic parameters and after that and a few tie rod ends the truck was good to go. My only question is what the heck was wrong with the original ECM and why didn’t CAT ET pick up anything or even detect the ECM to begin with.
C12 Question
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by raferko, Oct 23, 2018.
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It was code 42. Had to look at my bill from cat. What had happened was I disconnected batteries and reinstalled new batteries on my truck and was told that internal battery was failed on ecm. So once I hooked up new batteries to truck the ecm basically failedspsauerland Thanks this.
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