DTC U1000 Class Data link Malfunction .

Refer to DTC U1000 and DTC U1255 Class 2 Communication Malfunction

SIR and ONSTAR®

DTC U1016 Loss of PCM Communications.

Refer to DTC U1001-U1254 Lost Communication with XXX

SIR and ONSTAR®

DTC U1088 Loss of SIR / SDM Communications .

Refer to DTC U1001-U1254 Lost Communication with XXX

ONSTAR®

DTC U1192 Loss of VTD Communications .

Refer to DTC U1001-U1254 Lost Communication with XXX

ONSTAR®

DTC U1300 Class @ Data Link Low .

Refer to DTC U1300 Class 2 Data Link Low

SIR and ONSTAR®

DTC U1301 Class @ Data Link High .

Refer to DTC U1301 Class 2 Data Link High

SIR and ONSTAR®

DTC U1304 Loss of UART Communications .

Refer to DTC U1304 Lost Communication with UART System

ONSTAR® and ABS