GM Service Manual Online
For 1990-2009 cars only

DTC

Description

Illuminate OnStar® Telltale

B1000

DTC B1000 ECU Malfunction

Yes

B1004

DTC B1004 Keep Alive Memory (KAM) Reset

No

B1009

DTC B1009 EEPROM Checksum Error

No

B2462

DTC B2462 GPS Signal Error

Yes

B2476

DTC B2476 Cellular Phone Select Service Switch Malfunction

Yes

U1300

DTC U1300 Class 2 Data Link Low

No

U1301

DTC U1301 Class 2 Data Link High

No

U1500

DTC U1500 Inter-Device Dedicated Bus Malfunction

No