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PLEASE HELP....I HAVE 99 RAM 2500 DIESEL AND IT HAS A NEW COMP TRANNY IN IT AND THE OLD TRANNY DID THE SAME THING...WHEN THE FUEL GETS LESS THAN A 1/4 OF A TANK IT WILL NOT SHIFT OUT OF FIRST GEAR...I HAVE REPLACED THE FUEL MODULE IN THE TANK AND IT ALSO HAS A FASS FUEL SYSTEM ON IT...IT DOES NOT SHOW ANY CODES EITHER...I DONT KNOW WHERE TO LOOK NEXT AND NO ONE AROUND HERE CAN TELL ME WHATS WRONG OR WHERE TO START.....PLEASE HELP.....
Clean your battery terminals and check the ground wire on the chassis and make sure it is clean an tight. It sounds crazy but it just might work. Good Luck