Some 2020-2022 Aviator Plug In Hybrid (PHEV) vehicles built on or before 14-Jan-2022 may exhibit a 12-volt battery discharged while the vehicle is plugged in during high voltage battery charging and/or inoperative level 2 charger (220/240 volts) at customers residence but charging performance operates as intended at a dealership or other locations. This may be due to the software in the battery charger control module (BCCM) (also known as secondary on-board diagnostic module SOBDM). To correct the condition, follow the Service Procedure to reprogram various modules starting with the PCM.
