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. Sounds like a network communication issue. Your best bet, take it to a qualified repair shop. When no message is detected from a learned ID number for 5 seconds, Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. Once an ID number is learned by a module, it will monitor for that modules node alive message. 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 identification (ID) number of the module which sent the message for state of health monitoring/node alive messages. P0300 is a random misfire which could be low fuel pressure, vacuum leaks etc. Vehicles with more then one control module have a serial data network for the control modules to talk to each other on. What make, model an year vehicle ? U1153 is a communication code.
Test the class 2 serial data circuit of the module that is not communicating for an open between the module and the star connector. Test the battery positive voltage and ignition B+ circuits of the module that is not communicating for an open or a short to ground. When no message is detected from a learned identification number for 5 seconds, a DTC U1096, where 096 is equal to the 3 digit identification number, is set. Each module on the class 2 serial data circuit which is powered and performing functions that require detection of a communications malfunction is required to send a "Node Alive" message every 2 seconds.
Once an identification number is learned by a module, it will monitor for that modules "Node Alive" message. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring (Node Alive messages). Do you know what U code's are about ? Does the vehicle start an run ?
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