2012-TL battery management system may NOT operate

I just bought this used 2012-tl/tech. I noticed a low battery message and the dealer said it was caused by a sensor. They told me they replaced the sensor. The message disappeared from the display. Today, I noticed a message in the INFOR display that "Battery management system may not operate" "call your dealer" It also displays a date when the above message was generated, which is exactly when I brought the car to the dealer to check the low battery issue.

Any idea please? I am concerned that the dealer did not replace the sensor but just disabled the Battery management system (message display)