"Diagnostic trouble code (DTC) takes the form of an alpha-numeric sequence. A Cadillac's onboard diagnostic system issues a DTC whenever a problem is sensed within the car's engine or electrical system. If you're concerned about clearing the code, then the hardest part of the job, the repair itself, has been completed. Resetting this code, and thereby wiping it from the Cadillac's system, requires the use of an OBD-II compliant scanning tool.
Connect the scanner to the Cadillac's diagnostic system. The scanner itself has a large plug at the end of a cable, and it should fit into the Cadillac's diagnostic port. You can find this port on the driver's side, in the leg space in front of the car seat.2
Turn on the scanning tool.3
Start the Cadillac. The car's computer has to be up and running, or the OBD-II scanning tool will have nothing to interact with.4
Wait for the diagnostic trouble code to appear on the scanning tool's screen.5
Clear the code. Issuing this command should be a simple push of a button, but because scanners are all slightly different by brand, locating the exact button will require consulting the hardware's user's manual.