GM Service Manual Online
For 1990-2009 cars only

Description

Module

DTC U1000 and U1255 Class 2 Communication Malfunction

PCM, IPC, BCM, SDM, EBCM, TCSCM

DTC U1001-U1254 Loss of Communications with xxx Module

PCM, IPC, BCM, SDM, EBCM, TCSCM

DTC U1300 Class 2 Data Link Low

PCM, IPC, BCM, SDM, EBCM, TCSCM

DTC U1301 Class 2 Data Link High

PCM, IPC, BCM, SDM, EBCM, TCSCM