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You have a power voltage issue or a communication issue going on between the cab controller and the engine controller. The bad part is you will have to have DDDL or Freightliner Service Link to see where the communication breakdown is. With these trucks, there is no other way to diagnose the issue due to the CAN BUS system on the truck. It is just the way the truck is engineered.
I would check all battery connections first before taking it to the shop. Also check the battery voltages to make sure you don;t have a bad battery stealing the voltage and causing the communication errors.
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