Parasitic battery drain (Data Communication Module) — covered by extension + settlementmoderate
A well-documented pattern on this generation: the car's telematics box — the DCM, or Data Communication Module — keeps drawing power after the car is off, flattening the 12-volt battery over a day or two and ruining batteries over time. Owners report being stranded and cycling through several batteries. Subaru extended the DCM warranty (8 years/100,000 miles on this era) and there was a class-action settlement plus a 12-volt battery warranty extension. If a 2016 has a history of repeat dead batteries, this is the cause — and the fix is a software update or DCM work that may be covered. Ask whether it was done.
Sources: NHTSA complaint database, 2016 Subaru Outback (true count 638) · NHTSA recalls + manufacturer communications (DCM/battery extensions, recall documents)
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Under DCM extension / settlement