GM
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Class 2 Communication Malfunction Conditions
Cause:
    DTC B1327, U1300, U1301 and U1305 not current (any particular device on the Class 2 serial data circuit will support some subset of these codes), the ignition switch position requires serial data communication to occur, then at least one operating parameter has not been associated with an identification number within 5 seconds after beginning serial data communication (a default value is used)

Infiniti
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    CAN communication line - signal malfunction
Cause:
    Wiring

Isuzu
Type:
    Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Class 2 communication ID not learned
Cause:
    ECM