The car is a front wheel drive 2008 DTS with about 45k. I first thought it was the exhaust cooling but quickly realized it was something else. I parked the car in the drive about 12 hours ago and it is still sitting there clicking.
I wouldn’t even be able to begin to try and diagnose this. All the pros on here will help you. I concur with submariner. Electrical on cars is not something I prefer to mess around with. Odd though Submariner wouldn’t that trigger the service suspension message? Is that on by any chance?
If the noise is on the passenger side, it’s coming from the ELC compressor area.
Very FEW issues with the rear leveling suspension will trigger a SERVICE SUSPENSION message on the DTC. I’ve had a complete failure before and got no message. In fact. That message only shows up if the ride height is noted to be severely high, or severely low. It will, however, trigger codes readable by a dealer-level reader, such as Tech II. I doubt most auto parts stores scanners will be able to see those codes.
Start with a visual check under that fender. Wiring corrosion and compressor head failure are common, especially if the car was driven in snowy climates.