DTC U1001 to U1254: Module U1XXX Communication: Notes
WARNING: This page is about a different car, the 2002 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The module ID Number list provides a method for determining which module is not communicating. A module with an internal class 2 serial data circuit malfunction or which loses power during the current ignition cycle would have a Lost Communication DTC set by other modules. Use the module ID Number list in order to determine which module is not communicating and the DTC U1001 - U1254 diagnostic table in order to diagnose the malfunction.