GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module

U1000

Class 2 Data Link Malfunction-Refer to DTC U1000 and U1255 .

ESC, RCDLR

U1016

Loss of Communications with PCM-Refer to DTC U1001-U1254 .

BCM, EBCM, ESC, HVAC, IPC, DDM, PDM, Radio, RCDLR, SCM

U1040

Loss of Communications with EBCM-Refer to DTC U1001-U1254 .

IPC

U1056

Loss of Communications with ESC-Refer to DTC U1001-U1254 .

IPC

U1064

Loss of Communications with BCM-Refer to DTC U1001-U1254 .

HVAC, IPC, Radio, RCDLR, SCM, SDM

U1088

Loss of Communications with SDM-Refer to DTC U1001-U1254 .

IPC

U1096

Loss of Communications with IPC-Refer to DTC U1001-U1254 .

BCM, HVAC, IPC, RCDLR

U1128

Loss of Communications with Radio-Refer to DTC U1001-U1254 .

IPC

U1153

Loss of Communications with HVAC-Refer to DTC U1001-U1254 .

IPC

U1160

Loss of Communications with DDM-Refer to DTC U1001-U1254 .

IPC, Radio

U1161

Loss of Communications with PDM-Refer to DTC U1001-U1254 .

IPC, Radio

U1166

Loss of Communications with SCM-Refer to DTC U1001-U1254 .

IPC

U1176

Loss of Communications with RCDLR-Refer to DTC U1001-U1254 .

IPC

U1255

Class 2 Data Link Malfunction-Refer to DTC U1000 and U1255 .

BCM, EBCM, ESC, HVAC, IPC, DDM, PDM, Radio, RCDLR

U1300

Class 2 Data Link Low-Refer to DTC U1300 .

EBCM

U1301

Class 2 Data Link High-Refer to DTC U1301 .

EBCM