2021 Subaru Outback · symptom sheet
Battery dies or the car will not start
- 43owner reports
- 5,000median miles
- 0involved a crash
Newest report Aug 26, 2026 · checked Oct 2, 2026
75 of the 296 complaints on this car are about the electrical system. 43 of those describe dead battery. Only windshield is reported more often on this car.
Tick what matches of 43 reports
Dead battery on other Outback years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2014, 2023, 2024, 2025, 2026.
What this problem usually is
These owners walk out to a car that's dead. Some find it drained after sitting only a day or two, some need a jump start every week, and some have had the battery replaced more than once without the problem going away. A good number describe the dealer testing the battery, calling it fine, and sending them home.
What got replaced
Owners who name the part that was replaced mention the battery (41 reports), the starter (3 reports) and the module (3 reports).
Recalls and investigations
No recall on the electrical system covers the 2021 model year as of Oct 2, 2026.
When it happens
The middle half of failures fell between 1,200 and 24,000 miles, from the 21 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 1 service bulletin or notice for the 2021 Subaru Outback that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experiencing battery drain when the ignition is off, leading to no-start conditions or frequent jump-starts.This is an revised ...
What owners wrote
“My car battery dies prematurely. I am about to have my third battery since buying the car.”
Filed Oct 17, 2022
“Battery repeatedly drains with short drives or if car is parked for 72 hours such that the vehicle will not start.”
Filed Sep 16, 2022
“Wind shield very very weak cracks very easy I have had for 1.5 years, I am on my 6th windshield, if any thing hits the edge of the windshield it totally cracks. Also having battery issues. on my third battery care has 47 k miles.”
Filed Sep 6, 2022
“vehicle about 14 months old, I purchased new Tried to start vehicle battery dead, no lights or other acc. had been left on. two weeks later battery would not start car, I jump started car according to directions in owners manual. After jump start several check engine lights came on, cruise control did not work. lane control and "EYESIGHT" failure warning light was on. Subaru dealer replaced battery under warranty”
Filed May 16, 2022
Should you keep driving it?
This page can't tell you that. 0 of 43 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Taking it to a shop? How to describe this problem so it gets found
Other problems on this car
- Windshield cracks or distorts 105 reports
- Infotainment, screen or backup camera fails 27 reports