Trailer lights or brakes that do not function can reduce the driver’s ability to control the trailer and decrease the trailers visibility to other road users, increasing the risk of a crash.

When towing a trailer, the integrated trailer module (ITRM) may lose communication with the vehicle, possibly causing a loss of brake and turn signal lights, or a loss of brake function. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, " Lamps, Reflective Devices, and Associated Equipment."

What to do: Book this in with a dealer now. It affects a safety system.