GM Service Manual Online
For 1990-2009 cars only

DTC

Definition

U1128

Loss of Serial Communications - IRC

U1255

Generic Loss of Serial Communications for Class 2 Devices

U1300

Class 2 Short to Ground

U1301

Class 2 Short to Battery

B1552

Loss of BCM Keep Alive Memory (KAM)

B1556

BCM EEPROM Write Error

B1558

BCM EEPROM Checksum Error

B1970

Exterior Lamp Power Fault

B1971

Inadvertent Power Fault

B1972

Low Power Driver Fault

B1973

High Power Fault

B1982

Battery Voltage Too High

B1983

Battery Voltage Too Low

B2470

Daytime Running Lamps Fault

B2471

Interior Lamp Fault

B2472

Low-Beam Fault

B2473

High-Beam Fault

B2476

Park Lamp Fault