When the heater is plugged in, prolonged corrosion could cause a resistive short, increasing the risk of overheated or melted wiring which can increase the risk of a fire.

Engine

Date Announced
DEC 18, 2018
Vehicles Affected
410,289
Ford Recall #
18S45
NHTSA Campaign #
18V894000
Summary
Ford Motor Company (Ford) is recalling certain 2015-2019 Ford F-150 and 2017-2019 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, and F-550 Super Duty pick-up trucks equipped with an engine block heater. Water and contaminants may get into the block heater cable's splice connector causing corrosion and damage.
Actions
Ford will notify owners, and dealers will disable the block heater cable, free of charge. Once parts are available, Dealers will replace the engine block heater cable, free of charge. The recall began June 3, 2019. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 18S45.