This bulletin applies to 2021-2023 RAM 2500, 3500, 4500/5500 trucks built on and after Jan. 1, 2021, and on and before March 31, 2023, equipped with four-wheel drive.
A small number of 2021 Cadillac XT4 and XT5 vehicles may have a coolant inlet pipe that may present an obstructed threaded hole for the coolant temperature sensor, which could result in the check engine light coming on or a potential coolant leak.
