SERVICE NUMBER 16214848 HARDWARE NUMBER 16175490. But you will receive one that looks like the picture and fits in your vehicle. Most issues can be avoided if you provide us your vehicle's OEM part number, VIN number and mileage during checkout.
The product is very good but unfortunately we didn't have correct security demobilizing sheets which transfer the ignition key data from BCM to ECM and that's why we couldn't start the car and this information was provided by Cadillac dealer .