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  1. L

    LMTV (M1079) STOPS RUNNING WHILE DRIVING

    Yes that is it. You will have a special jumper to connect the cable ends that used to go into that box. The power for the ECM goes through that and problems with the box or wiring could cause the “engine switch off” symptoms the OP describes. As it is bolted directly to the engine, depending on...
  2. L

    LMTV (M1079) STOPS RUNNING WHILE DRIVING

    1st two things to check from the 3126 book are wiring related
  3. L

    LMTV (M1079) STOPS RUNNING WHILE DRIVING

    Could even be bad wiring to the ECM, my understanding of the CAT programming is that it will derate the power but not actually shut off the engine from an overheat. Bottom line, you need a scan tool hooked to your truck while driving to continue diagnosis. Otherwise you are pissing in the wind.
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