An electronic parking brake that cannot be engaged while in "park," may result in a vehicle rollaway, increasing the risk of a crash.
The Skid Control ECU within the Brake Actuator Assembly may falsely detect an overcurrent condition of the Electronic Parking Brake (EPB) Actuator and enter a failsafe mode which prevents the EPB from being engaged. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 135, "Light Vehicle Brake Systems."
What to do: Book this in with a dealer now. It affects a safety system.