NHTSA complaint #11425921

Owner complaint summary

My 2019 Outback has had 2 incidents where the battery was dead without an explanation. There are 24000 miles on it. The most recent incident occurred less than a week after the dealer serviced the vehicle. The service included a battery test and I was told it tested good. The car was parked in my home garage, and from all indications, no lights were left on, doors/tailgates open etc. This was confirmed when the Subaru STARLINK roadside assistance provider came to jump the vehicle. Immediately after the vehicle was started, I took it to the dealer and requested a battery check. They showed the battery was good but deeply discharged, so left it on a charger for over an hour while I waited. In speaking to the service representative at the Subaru dealer, I was told that on new cars, alternators no longer charge a battery, but simply maintain the existing charge level. They claimed that a light or something of that nature was left on, a door left open, etc. I am certain this was not the case, as I keep all interior light switches in the off position, and once the vehicle was charged, no lights were on. Also, no doors were open or ajar when this happened. I requested they check the electrical system to diagnose the cause of the battery drain, but they explained this would not be covered under warranty since the battery had tested ok. The dealer recommended that I keep a trickle charger on it when parked at home to prevent recurrences. I don’t feel this is an acceptable solution for a vehicle that is merely two years old with minimal miles and fully under warranty. While I was inconvenienced by this and had to arrange a ride to an appointment as a result, it did not create an immediate safety issue (this time). A similar set of circumstances occurred in late March of 2021 when I was out of town visiting a family member. At that time, I also was not able to determine a cause. Since that was the first occurrence, it didn’t create the same level of concern.