WOW! Got mine installed and didn't notice anything until I backed into the garage. Shut the truck off and opened the door. Thought to myself funny... wonder why there are sirens running on such a nice day as it is today. Then I took my foot off the brake and the sirens stopped! Yep, guess I'll be sending these back too...those are the ones that I ordered a couple of weeks ago. They do work and you don’t get any errors, but I could hear the fan noise inside the cabin. The fan starts operating when the LED reach a certain temperature. For me, after holding the brake for around 5-7 seconds, I could hear the cooling fans. I returned them. Let me know if you experience the same thing.