Module Communications Network

Communications Network

DTC Charts

NOTE: Network DTCs (U-codes) are often a result of intermittent concerns such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures such as module reprogramming will often set network DTCs. Replacing a module to resolve a network DTC is unlikely to resolve the concern. To prevent repeat network DTC concerns, inspect all network wiring, especially connectors. Test the vehicle battery, refer to Battery, Mounting and Cables Testing and Inspection.

NOTE: DTC U1900 sets in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module.

Communication Network DTC Chart