TSB: Encore Intercooler Icey Sludge
Certain 2020-2022 Buick Encore GX vehicles may have a condition in which ice or sludge can accumulate in the charge air cooler (CAC) or closed crankcase ventilation (CCV) system when driving in extremely cold weather conditions of 0 degrees F or less.
Reprogram the ECM using the latest available software.