GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module

U1000

DTC U1000 and U1255

ECM, EBCM, SDM, IPC, RCDLR, SDGM, TCM, Chime Module

U1016

DTC U1001-U1254

Radio, EBCM, SDM, Chime Module

U1024

DTC U1001-U1254

ECM, IPC

U1040

DTC U1001-U1254

ECM, SDM, IPC

U1088

DTC U1001-U1254

IPC, SDGM

U1096

DTC U1001-U1254

SDM, ECM, SDGM, Chime Module

U1128

DTC U1001-U1254

IPC, SDGM

U1176

DTC U1001-U1254

IPC, SDGM

U1111

DTC U1001-U1254

IPC

U1031

DTC U1001-U1254

SDM, Radio, ECM

U1255

DTC U1000 and U1255

ECM, EBCM, SDM, IPC, RCDLR, SDGM, TCM

U1300

DTC U1300, U1301, or U1305

ECM, SDM, IPC, RCDLR, SDGM, TCM, Chime Module

U1301

DTC U1300, U1301, or U1305

ECM, SDM, IPC, RCDLR, SDGM, TCM, Chime Module

U1305

DTC U1300, U1301, or U1305

EBCM, SDM, RCDLR, SDGM, TCM

U1800

DTC U1800, U2105, U2106, or U2108

ECM

U2104

DTC U2104

ECM

U2106

DTC U1800, U2105, U2106, or U2108

ECM