Medium and Heavy Trucks
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You need to check the fuses and power connections and keyswitch power to the engine and ecm. The reason it will not start and you cannot connect to the is because the ecm is not waking up. A normal powered up ecm will display the check and stop engine lights on the display than go off if there are no fault codes. Please don't forget to rate my service.
Hi, Just following up. Please don't forget to rate my service.