2018 Subaru Forester · symptom sheet
Battery dies or the car will not start
- 44owner reports
- 34,000median miles
- 0involved a crash
Newest report Sep 17, 2026 · checked Oct 2, 2026
71 of the 495 complaints on this car are about the electrical system. 44 of those describe dead battery.
Tick what matches of 44 reports
Dead battery on other Forester 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, 2015, 2021, 2022, 2023, 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 (43 reports).
Recalls and investigations
No recall on the electrical system covers the 2018 model year as of Oct 2, 2026.
When it happens
The middle half of failures fell between 11,735 and 54,000 miles, from the 12 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 8 service bulletins or notices for the 2018 Subaru Forester 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 ...
Subaru has extended the Data Communication Module (DCM) warranty from 3 years 36,000mi to 8 years or 100,000mi. In rare cases, customers may experience a dead battery as a result of the DCM continually trying to access the 3G network.
Subaru of America, Inc. (Subaru) is extending the Data Communication Module (DCM) warranty from three years (36 months or 36K miles) to eight years (96 months or 100K miles), whichever comes first.
Subaru Battery Drain Product Liability Litigation.
4 more on the 2018 Subaru Forester page.
What owners wrote
“My car is a 2018 with only 28100 miles on it. I have now had to replace the battery three times. Subaru tells me I need to drive it every two days in order to keep it from discharging the battery. This is unacceptable. Clearly there is a parasitic drain. My issue is very common, and affects many late model subarus. I have already been stranded several times by this issue.”
Filed Feb 2, 2023 · 28,100 miles
“new battery that is only 14 months since installation (at subaru dealer) and 5,000 miles on the car is flat. I did not use my car for about 1 1/2 weeks in the garage and it is totally flat. This is not normal and my friend with an outback has similar problems so I think my issue is not unique.”
Filed Dec 26, 2022 · 5,000 miles
“We have discovered that our 2019 Forester has a parasitic battery drain of almost 1 amp when the car is off and the hatchback is open. This resulted in full battery drain several times until we did several tests to determine the root cause of the problem (Subaru was of no help). This led to replacement of the OEM battery at about 52,000 miles.”
Filed Sep 26, 2022 · 52,000 miles
“Bought vehicle June 2021. Battery failed multiple times. Sometimes it will start with a jump, but on 12/2/21 it was completely dead and required tow to Michael's Subaru dealer in Bellevue, WA. Battery was replaced twice within 6 week period.”
Filed Dec 14, 2021
Should you keep driving it?
This page can't tell you that. 0 of 44 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 153 reports
- Airbag warning light or recall 97 reports
- Seat belt or seat problems 36 reports