here
P0600 - serial communication link malfunction.
There are exclusive communication lines between the ECM/PCM (engine control module/powertrain control module), the instrument gauge assembly, the keyless receiver unit, and the underdash fuse/relay box with builtin multiplex control unit.
There is either a failure of one of the abovementioned units, a short/open in the communication lines, or blown fuse.
hope its help!