Ignore the code
This TSB applies to 2008 Isuzu I-290/I-370 vehicles. Technicians may find Diagnostic Trouble Code (DTC) U1305 (Class 2 Data Link High or Low) stored in the Instrument Panel Cluster (IPC) trouble code list.
The DTC may be a current code or stored as a history code and it should be ignored. No diagnosis or repairs should be performed to fix this false DTC. The DTC does not effect the operation of the vehicle or IPC in any way.