GM Service Manual Online
For 1990-2009 cars only

Description

Module

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

RFA, RTD

DTC U1016 Loss of Communications with PCM. Refer to DTC U1001-U1254 Lost Communication with XXX

BCM, HVAC, IPC, LDCM, RDCM, Radio, RFA, RTD, SCM, TCS

DTC U1040 Loss of Communications with TCS. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1056 Loss of Communications with RTD. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1064 Loss of Communications with BCM. Refer to DTC U1001-U1254 Lost Communication with XXX

HVAC, IPC, Radio, RFA, SCM, SDM

DTC U1088 Loss of Communications with SDM. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1096 Loss of Communications with IPC. Refer to DTC U1001-U1254 Lost Communication with XXX

BCM, HVAC, IPC, RFA

DTC U1128 Loss of Communications with Radio. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1153 Loss of Communications with HVAC. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1160 Loss of Communications with LDCM. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC, Radio

DTC U1161 Loss of Communications with RDCM. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC, Radio

DTC U1166 Loss of Communications with SCM. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

DTC U1176 Loss of Communications with RFA. Refer to DTC U1001-U1254 Lost Communication with XXX

IPC

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

BCM, HVAC, IPC, LDCM, RDCM, Radio, RFA, TCS

DTC U1300 Class 2 Data Link Low. Refer to DTC U1300 Class 2 Short to Ground

TCS

DTC U1301 Class 2 Data Link High. Refer to DTC U1301 Class 2 Short to Battery

TCS