"Error 2"

[BestRadarDetectors]

Thats what I was thinking. Just being sure.. Trying to eliminate every single possibility of power issue.

I use the main ground that the battery is hooked to for everything. I think I have 3 connections on there. Could that be an issue? I have everything tightened down together on there really well. The reason I do this is because theres not any good place to do it inside the cabin, so I just do everything on main ground and run wires through firewall since its so easy to go through my firewall.

Just find a close metal screw and ground it directly to the body. You definitely dont need to run a ground wire all the way out to the front of the car to ground it to the Battery Ground. I gather you extended the original Ground wire to reach all the way out there. Find a screw under the dash and ground the wire closer to the CPU. The longer the wire the less the current that can pass through the wires unless you are extending with larger gauge wire.