GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

DTC U1000 and 1255

DTC U1000 and U1255

DTC U1001 and U1255

DTC U1001-U1254

DTC U1300, U1301, or U1305

DTC U1300, U1301, or U1305

DTC U2100

DTC U2100

DTC U2104

DTC U2104