Self-Diagnostic System: Notes
WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2001 Pontiac Grand Am, and 2001 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The presence of DTCs which begin with "U" indicate a module on Class 2 serial data line is not communicating.