GM Service Manual Online
For 1990-2009 cars only

DTC Number/Description

Module

DTC B1007 EEPROM Write Error in Body Control Systems

MSM

DTC B1009 EEPROM Checksum Error in Body Control Systems

MSM

DTC B1327 Device Power Circuit Low in Engine Electrical

MSM

DTC B1870 Driver Belt Tower Up Switch Circuit Malfunction

MSM

DTC B1875 Driver Belt Tower Down Switch Circuit Malfunction

MSM

DTC B1900 Driver Belt Tower Vertical Sensor Malfunction

MSM

DTC U1000 Loss of PCM Class 2 Serial Data Communication

Refer to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications.

MSM

DTC U1305 Class 2 Short to Ground/Battery

Refer to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications.

MSM