On the 2016 Hyundai Genesis, the P1235 is pointing to a problem with the Active Air Flap Actuator. The AAF is located between radiator grille and radiator, and consists of an actuator and 6 air flaps. During high speed driving, it will reduce the air resistance by closing the air flaps. This improves the fuel efficiency and enhances the driving stability. If the engine is overheated, the system will open the air flaps to drop the temperature. So, this can be a problem with the wiring to the air flap actuator, a problem with the linkage to the flaps or a problem with the actuator motor itself. These will all need to be inspected and tested for proper operation. In the meantime… it is safe to drive the vehicle. The flaps are usually stuck in the open position when this happens, so there is usually no risk of engine over-heating.
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