For 1990-2009 cars

DTC | Definition
--- | ---
U1128 | Loss of Communications With IRC
U1255 | Generic Loss of Class 2 Data
U1300 | Class 2 Short to Ground
U1301 | Class 2 Short to Battery
U2100 | CAN-BUS Communication Malfunction
U2103 | Fewer Controllers On Bus Than Programmed
U2104 | CAN-BUS Reset Counter Overrun
U2105 | Lost Communication With Engine Control System
U2106 | Lost Communication With Transmission Control System
U2108 | Lost Communication With ABS Control System