Parasitic battery drain from the telematics modulemoderate
A recurring thread across this year and the next two: the car sits for a few days and the battery is flat. Owners trace it to the DCM — the Data Communication Module, the telematics box behind Subaru's Starlink connected services — which keeps drawing current after the car is switched off. One owner reports buying a new battery, taking the module update, and finally pulling the module's fuse, and still finding the battery dead. Another was stranded repeatedly at 37,000 miles. Subaru's bulletin file for this model year holds a warranty extension for the module covering 2016 to 2018 cars, though the summary does not state the years-and-miles terms, so ask the dealer to confirm eligibility against the VIN. Practical test on a used car: ask when the battery was last replaced, and if the answer is 'recently, twice,' that is the pattern.
Sources: NHTSA complaint database, 2016 Subaru Crosstrek (true count 134) · NHTSA recalls database and Subaru manufacturer communications (campaign summaries and warranty-extension bulletins)