GM Service Manual Online
For 1990-2009 cars only

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