![]() ![]() When the modules stop communicating, ignition is turned off, the current Loss Communication DTC is cleared but the history DTC remains. When a malfunction such as a open fuse to a module occurs while modules are communicating, a Loss of Communication DTC is set as current. The table below list the modules on the Class 2 Serial Data Circuit that will set a U1000 or U1255 and should be actively communicating the previously described messages on the Class 2 Serial Data Circuit. When more than one critical parameter does not have an ID number associated with it, the DTC will only be reported once. When a module does not associate an ID number with at least one critical parameter within about 5.5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for State of Health monitoring, Node Alive messages. Operating information and commands are exchanged among the modules. ![]() Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Class 2 Communication Malfunction, Do you know what class 2 serial data communication network is ? What module set this code an what kind of scan tool did you use to read this code. ![]()
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