GM Service Manual Online
For 1990-2009 cars only

DTC

Description

Type

Illuminate SECURITY Indicator

B1009

DTC B1009 EEPROM Checksum Error

VTD

Yes

B1327

DTC B1327 Battery/Source Voltage Low

VTD

Yes

B1658

DTC B1658 EEPROM Checksum Error

VTD

Yes

B2721

DTC B2721 Invalid Coded Key is Present

VTD

Yes

B2723

DTC B2723 Key Not Present

VTD

Yes

B2734

DTC B2734 Coded Key Controller Memory Failure

VTD

Yes

B2735

DTC B2735 Key Decoder in Assembly Learn Mode

VTD

Yes

B2955

DTC B2955 Key Code Input Shorted to Battery

VTD

Yes

B2960

DTC B2960 Invalid Coded Key Present

VTD

Yes

B3031

DTC B3031 Key Decoder Device in Assem Learn Mode

VTD

Yes

B3055

DTC B3055 Key Not Present

VTD

Yes

U1000

DTC U1000 Class 2 Communication Malfunction in Data Link Communications

VTD

Yes

U1016

DTC U1016 Loss of Communications with PCM in Data Link Communications

VTD

Yes

U1064

DTC U1064 Lost Communications with BCM in Data Link Communications

VTD

Yes

U1192

DTC U1192 Loss of VTD Class 2 Serial Data Com in Data Link Communications

VTD

Yes

U1255

DTC U1255 Generic Loss of Class 2 Data in Data Link Communications

VTD

Yes

U1300

DTC U1300 Class 2 Short to Ground in Data Link Communications

VTD

Yes

U1301

DTC U1301 Class 2 Short to Battery in Data Link Communications

VTD

Yes

P1630

DTC P1630 Theft Deterrent Learn Mode Active in Engine Controls

VTD

Yes

P1626

DTC P1626 Theft Deterrent Fuel Enable Signal Lost in Engine Controls

VTD

Yes

P1631

DTC P1631 Theft Deterrent Start Enable Signal Not Correct in Engine Controls

VTD

Yes