WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
DTC
Module
NOTE:
Diagnose all BXXXX codes prior to diagnosing any PXXXX codes unless otherwise directed by the Diagnostic System Check.