For 1990-2009 cars

DTC | Diagnostic Procedure | Module(s)
--- | --- | ---
U1064 | DTC U1001-U1254 | IRC, Phone, OnStar® VIU, AMP, Radio/Tape/CD Player
U1128 | DTC U1001-U1254 | BCM, Phone, VIU
U1129 | DTC U1001-U1254 | BCM, IRC, Phone, VIU
U1255 | DTC U1000 and U1255 | BCM, IRC, VIU, Phone
U1300 | DTC U1300 | BCM, IRC, VIU, Phone
U1301 | DTC U1301 | BCM, IRC, VIU, Phone
U2100 | DTC U2100 | EBCM, ECM, TCM
U2103 | DTC U2103 | EBCM, ECM, TCM
U2104 | DTC U2104 | EBCM, ECM, TCM
U2105 | DTC U2105-U2108 | EBCM, TCM
U2106 | DTC U2105-U2108 | EBCM, ECM
U2108 | DTC U2105-U2108 | ECM, TCM