2020 Subaru Forester: battery drain or dead battery

Filed Oct 8, 2026 · Electrical · NY

Experienced parasitic battery drain which disabled the vehicle. The drain is tied to a 30 amp fuse labeled "BACKUP" under the hood of the vehicle. This fuse controls the touchscreen, backup camera, interior lights, key fob and radio. There were no warning lights or trouble codes associated with this issue. The problem was replicated by both a Subaru dealer and an independent shop. Neither could find the immediate problem without further investigation, which would have cost more than $1000. I have not contacted the manufacturer, police or insurance rep. The car will operate with the fuse pulled but the safety features listed above will be disabled.

Filed Feb 20, 2026 · Airbags, Electrical · NY

The airbag system has a sensor issue and I keep getting warnings from Subaru to get it fixed because it affects the seatbelts. The garage where I take my car says they are unable to get the part needed for the passenger sensor. And, Subaru says they need to replace the whole harness for $6000. Makes me wonder why a safety issue like this one seen in other Subaru’s have been recalled but not my model… Also the start stop feature drains the battery excessively. I have had to replace the battery twice in less than a year. I push the button to stop this feature the minute I get into the car.

Filed Oct 16, 2025 · Electrical, Engine · 36,585 miles · MA

The contact owns a 2020 Subaru Forester. The contact stated that while his wife was stopped at a red traffic light in the middle lane and surrounded by other vehicles, the auto START/STOP system engaged; however, when the brake pedal was released, the vehicle failed to restart. After several attempts, the vehicle eventually restarted, allowing the driver to safely pull over. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed with a dead battery. The dealer advised the contact about turning off the auto START/STOP system. The battery had been marked as good on two separate occasions. The battery was replaced. The contact reached out to the manufacturer, who opened a case but confirmed there was no warranty coverage on the vehicle. The manufacturer referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was approximately 36,585.

Filed Sep 3, 2025 · Electrical, Engine · CA

Parasitic battery drain

Filed Oct 7, 2024 · TX

The Auto stop start feature on the car drains the battery and alternator too much. It shouldn’t be forced on consumers. If it was a feature I wanted to use I should have the option of turning it on not be forced to always turn it off since I don’t use it. The alternator has already been replaced under warranty due to this feature. Between that and the dealership saying it would be over $700 to replace the battery is ridiculous. Today the car died while at a stop and the battery is needing to be replaced.

Filed Dec 14, 2023 · Electrical, Engine · KS

My vehicle has repeatedly required being jump-started after sitting for a period of time. Recently it has become a safety issue because the engine is designed to turn off at times in order to traffic to improve fuel efficiency. After research, Subaru has a known issue with the DCM system used to power the optional (subscription based) Starlink system. This system uses 3G signals to provide emergency assistance; however 3G signal has been decommissioned and the system is unable to connect to a tower and never stops trying. This creates a parasitic drain on the battery that can (and has) prevents the car from being able to restart from a stopped position.

Filed Nov 1, 2022 · Transmission · CA

The other day, the check engine light came on & Eyesight was disabled. I take it to the nearest mechanic who tells me that the cooling fans are running too long at idle & this could drain the battery. He also tells me to watch for the engine overheating. The recently checked coolant level had dropped lower than the minimum. I take it to dealer who keeps it for day. Similar to the 2 other complaints, the fault is related to TSB-09-80-21R calling for replacement parts to be installed. Subaru did not do any recall but instead waited for the parts to fail. I have minimal heat & the engine runs cool a lot of the time which affects emissions. My gas mileage is getting worse. The part is on backorder with no estimated time of arrival. I was told to just keep driving it & to let them know if it starts to run rough. The dealer said there are a lot of other cars & drivers in this situation at the dealer’s service department.

Filed Oct 17, 2022 · Electrical · CA

Repeated experiences of battery going dead after simply opening and closing doors a few times a day for four days. Engine was not started in this time. All interior light were off and rear hatch remained closed. Safety risk is being stranded in rural locations, at times with no cell service. Local Subaru dealer indicated I needed an authorization code from a battery lawsuit settlement to look into it. Lawsuit doesn’t include my vehicle VIN and only reimburses cost for battery replacement and possibly towing, not a repair. Research into the problem has indicated that this “parasitic drain “ can be remedied by replacing the defective older PRG Module with the effective newer one. This should be covered by the warranty on a two year old car. Local dealer would only refer to the lawsuit for direction. Suspect they are “buying time” until warranty expires to avoid doing the appropriate repair. See attached file for example of correct repair from another Subaru owner.

Filed Aug 18, 2022 · Electrical · NY

BATTERY DRAINS constantly and car will not start. This has happened several times the past month. I understand that it is an ongoing issue with other Subaru's. This is dangerous and must be fixed. This issue has happened 3 times in 2 weeks. 8/1, 8/13, 8/15/2022

Filed Jul 29, 2022 · Electrical · OH

Battery drained, towed to dealership twice within a month battery replaced then failed within 2 weeks everything checked out ok but battery still drained very frustrating

Filed Jul 14, 2022 · Electrical · 2,000 miles · NY

The contact owns a 2020 Subaru Forester. The contact stated that the battery was continually being drained and needed to be recharged frequently. There were no warning lights illuminated. The vehicle was taken to the local dealer however, a cause for the failure was not determined. The dealer recharged the battery. The vehicle was not repaired. The contact related the failure with electrical system defects which consistently drained the battery. The contact recharged the battery after each time the vehicle was driven. The manufacturer was not notified of the failure. The approximate failure mileage was 2,000.

Filed Apr 17, 2022 · Electrical · OR

Electrical defect in recent Subarus causes parasitic battery drain when the car is not in use. Our battery drained to the point that the vehicle couldn’t start without a jump due to this defect.