At a glance
What can fail
In cold, humid weather, ice crystals can form in the engine intake at the throttle, potentially preventing the throttle from returning to idle when you release the accelerator pedal.
What the fix does
The throttle body, throttle cable, charge air cooler piping, and crankcase ventilation hoses will be replaced.
Summarized — see the official notice for exact wording, dates, and contacts.