Daytime running lights stay on constantly irregardless if key is on/off, engine running or not, light switch is on/off, have replaced dash sensor and relay but no luck....any suggestions appreciated.

If you don't care to have the daytime running lights on at all. look for a fuse that is in your owner manual for the daytime running lights and remove it and see if your lights turn off .... but every thing else works in your car .... there are many things that could cause this problem to happen like faulty daylight running lights module is bad or your parking brake switch is not work proper to with the daytime running light circuit one thing you can try when the emergency brake is pushed the daytime running lights always in all cars should turn off ... to be honest you need to get a wiring diagram from the chevy dealer and follow the diagram to find out which part is bad and cause this issue cause there are fuses and relay and modules that make this system work right ..... if you dont understand the wiring diagram you will have to take your car to a electrical person who fixes only electrical problems not a mechanic ..... if you find the fuse that turns off the daytime running lights and everything else works leave it cause you still will have headlights and parking lights and dash lights by turning on the light switch at night