GM Service Manual Online
For 1990-2009 cars only

DTC

Description

Type

Illuminate SECURITY Indicator

B1007

DTC B1009 EEPROM Checksum Error

VTD

Yes

B1009

DTC B1009 EEPROM Checksum Error

VTD

Yes

B1327

DTC B1327 Battery/Source Voltage Low

VTD

Yes

B1328

DTC B1328 Battery/Source Voltage High

VTD

Yes

B2734

DTC B2734 Coded Key Controller Memory Failure

VTD

Yes

B2947

DTC B2947 Security System Sensor Power CKT Low

VTD

Yes

B2948

DTC B2948 Security System Sensor Power CKT High

VTD

Yes

B2955

DTC B2955 Security System Sensor Data CKT Malf

VTD

Yes

B2960

DTC B2960 Sec Sys Sensor Data Incorrect but Valid

VTD

Yes

B3028

DTC B3028 Starter Relay Interface Short to Ground

VTD

Yes

B3029

DTC B3029 Starter Relay Interface Open/Short to B+

VTD

Yes

B3031

DTC B3031 Key Decoder Device in Assem Learn Mode

VTD

Yes

B3055

DTC B3055 Key Not Present

VTD

Yes

U1016

DTC U1016 Loss of Communications with PCM in Data Link Communications

VTD

Yes

U1064

DTC U1064 Loss of Communications with DIM in Data Link Communications

VTD

Yes

U1255

DTC U1255 Class 2 Initialization Error in Data Link Communications

VTD

Yes