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2005 Mack problem

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We have a 2005 Mack with the meritor 12 speed autoshift. This truck has been a gremlin since we bought it but now can't even get it to start. Code that comes up is j1939. Doesn't seem to want to go into neutral. Can anyone help point me in the direction we need to go? Thanks

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Ok so pulled it into the shop the other day and let things warm up. Fired right up and went I to hear no problem. So parked it outside and as soon as it gets cooled down no go. Won't start and if we jump it across and get it started it won't go into gear. Is this some sort of starter issue? Can't understand why if it warmed up a little it will fire up fine but as soon as it get a little cool nothing.

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