The official notice
Defect
Kia Canada is conducting a Product Improvement Campaign that provides an update to the engine control module to detect potential problems before an engine fails. An engine failure could cause a sudden loss of power with an inability to restart. Note: This only affects Optima Hybrid and Optima Plug-In Hybrid (PHEV) models equipped with a 2.0 L NU GDI engine.
Safety Risk
A sudden loss of engine power could increase the risk of an accident. An engine failure could also create the risk of a fire.
Remedy
Kia will notify owners by mail and instruct you to take your vehicle to a dealer to update the software for the engine control module. Note: Kia recommends that you should always follow the correct vehicle maintenance schedule, which is printed in the Owner's Manual. If you experience unusual engine noise, reduced power, or a check engine/oil warning light, Kia advises you to immediately visit a Kia dealership to have your vehicle diagnosed.