GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module(s)

U1000

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

BCM, DIC, IPC, Radio, SDM,VIU

U1016

Lost communication with PCM. Refer to DTC U1001-U1254

BCM, DIC, EBCM, IPC, SDM, VIU

U1040

Lost communication with EBCM. Refer to DTC U1001-U1254

BCM, DIC, IPC, PCM, SDM

U1064

Lost communication with BCM. Refer to DTC U1001-U1254

DIC, IPC, Radio, PCM, SDM, VIU

U1088

Lost communication with SDM. Refer to DTC U1001-U1254

IPC, VIU

U1096

Lost communication with IPC. Refer to DTC U1001-U1254

DIC, SDM, VIU

U1128

Lost communication with Radio. Refer to DTC U1001-U1254

VIU

U1255

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

EBCM

U1300

Class 2 Data Link Low. Refer to DTC U1300

BCM, EBCM, Radio, SDM, VIU

U1301

Class 2 Data Link High. Refer to DTC U1301

BCM, EBCM, Radio, SDM, VIU

U1305

Class 2 Data Link Low or High. Refer to DTC U1305

DIC