my 2004 chevy duramax lly & allison has a fault when it gets to normal temp usually on a hill it goes into limp this mode 2000 rpm only, by shutting the engine down it will reset but only for a short time i have xcellerator programer its saying no codes i have imported this truck myself into australia and have no dealer backup we need some real HELP,problem started at 5000 km now reading 10000 km