Kia Sedona won't start when cold with immobilizer issue and codes P0606, P2105, and P2106 on Kia Sedona

Some Kia Sedona owners report experiencing difficulties starting their vehicles in cold weather, often linked to immobilizer issues and error codes P0606, P2105, and P2106. These problems are particularly noted in models manufactured between 2002 and 2016, where the immobilizer control module may fail to recognize the Smart Key, preventing the vehicle from starting. Additionally, the presence of error code P0606 indicates an internal ECM failure, which can occur when temperatures drop below 14 degrees Fahrenheit, necessitating ECM replacement. Codes P2105 and P2106 suggest malfunctions in the throttle actuator control system, leading to limited power conditions that further impede starting. Owners are advised to check the immobilizer control module if the Smart Key is unrecognized, replace the ECM for code P0606, and repair any issues within the throttle actuator control system to resolve these starting challenges effectively.