For HVAC climate control systems RPO code add
C67 which is the an electronic climate control control applicable to LeSabre and '96 and under PA.
C67 - HVAC SYSTEM, AIR CONDITIONER FRT ELECTRONIC CONTROLS
Here is another link for GM RPO codes and fairly current looking Service Parts Identification (SPID) label but like the others data is missing or not updated.
Click here
BTW - I saw the code was listed on the LeSabre thread.
Update: For the Regal/Century climate control RPO codes:
CJ2 - ACC - fully digital with ambient temp sensor
CJ3 - Dual climate control but manual controls only
C60 - Manual control non dual zone