Communication Network DTC Chart

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 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 .

NOTE: Some modules on this vehicle utilize a 5-character DTC followed by a 2-character failure type code. The failure type code provides information about specific fault conditions such as opens or shorts to ground. Continuous Memory DTCs have an additional 2-character DTC status code suffix to assist in determining DTC history.

DTC	Description	Source	Action
U0001:88	High Speed Controller Area Network (HS-CAN) Communication Bus; Bus Off	ABS module C-CM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.
U0028:08	Vehicle Communication Bus A: Bus Signal/Message Failures	RCM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.
U0028:88	Vehicle Communication Bus A: Bus Off	RCM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.
U0073	Control Module Communication Bus A Off	HCM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.
U0073:00	Control Module Communication Bus A Off	TCM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.
U3000:88	Control Module: Bus Off	APIM	The module could not communicate on the network at a point in time. The fault is not currently present (the module had to communicate with the scan tool to report this DTC). CLEAR the DTC. REPEAT the Network Test with the scan tool. VERIFY the integrity of the connectors and wiring Refer to Module Communications Network , for schematic and connector information.