My car's warranty expired about a month ago or so. Before it had expired, I had taken my vehicle in to have some service and asked if they could do an overall vehicle warranty check. They said they didn't really do that.
Turns out, I had a bad power conversion system on my car. Occasionally, and it turns out when I was using Destination Chargers, I would get limited charging messages. However, at home using my 220 outlet, the car would charge normal and using super chargers it would charge normal too.
I can demonstrate that my car had this problem before the warranty expired...but apparently that's not how the warranty works. I don't know why the service center told me they couldn't do a vehicle warranty check when I brought it in before the warranty expired, because turns out I was able to pay for a diagnostic after the warranty expired which confirmed the problem.
Anyways, it cost me $1717.77 to have my power conversion system replaced...if any of you are getting reduced charging rate messages, don't assume its the charger and get it checked about before your warranty expires.