you need a scan tool. the tool is about 2500 or more. it is obviously cheaper to have a shop diag it for you and give you a bid.
what is the problem you have??
thanks for using repairpal.
Roy
RepairPal Certified shops can diagnose and repair your 2000 Pontiac Bonneville. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.