Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2017 Subaru Legacy owners, lightly cleaned up (personal details are redacted by NHTSA).
I do not know what caused the fire, but maybe the battery or something electrical. The car stalled and the. I re-started the car and no warning lights came on the dashboard. I then parked the car. Upon exiting I noticed the front driver's hood smoking. I went into the bank was parked at and within minutes my car was in flames. The entire engine burned and my car is totaled. A fire marshal was coincidentally on scene and documented the entire event. Currently, this car is under investigation by both my insurance company Liberty Mutual and also Subaru. No warning lights were lit on the car. A fire and police report have been filed, and I have many pictures. If this car had gone on fire in my garage my house would also have burned.
The contact owns a 2017 Subaru Legacy. The contact stated while attempting to remove the key from the ignition, the key remained stuck in the ignition. The contact restarted the vehicle, shifted to reverse and back to park, and was able to remove the key from the ignition. The vehicle was taken to an independent mechanic but the vehicle was not diagnosed. The mechanic stated that sometimes the key might get rusted, causing it to be difficult to remove from the ignition. The manufacturer was not contacted. The failure mileage was approximately 68,000.
I have a problem of the car not starting several times now. If I do not drive it for several days the battery has to be jumped. I have purchased a jump starter to have in my car to make sure I am not stranded. If I do not have this I would be stuck. I noticed this after I bought the car and the dealer replaced the battery since it was under warranty in 2020. Now I have no warranty and the issue continues. I got a oil service last month at my dealership and my paperwork said everything is ok with my battery and connectors. I did not have the issue then since I was driving more. I noticed the other models have had the issue and got recalled for the part I think is called the (CAN ) that keeps the battery charged when it is parked. I believe the car has a problem I need to be checked. …
The car had been going on several local stops. Car was in the middle of a main thoroughfare ready to turn on to interstate ramp when the car completely stopped functioning. Battery light came on briefly before the vehicle became completely non-responsive. Among other things non-functioning, Emergency lights would not work, electric park brake would not engage. Could not get out of car to flee danger as car would freely roll and no way to stop except to hold brake with foot pressed. Ultimately car was chocked and jumped by AAA tow truck. Technician said battery was dead but alternator was working when he started it up. After 3 days of diagnostics, Subaru dealer cannot find a fault which let the new auto battery simply drain to nothing state and thus make the car non-responsive. Thank the good Lord this did not happen after turning on to the interstate.
Vehicle's batter discharges to the point where the vehicle has to be jumped or battery charged up. The vehilce had two batteries replaced in a span of 6 months and after the last repalcement I checked the batter about one month later and found the battery dead, 11.7 volts, I recharged the battery and made an appointment with the Subaru dealer in Santa Fe, NM. They checked the battery, which I could have done, said I needed to drive the vehicle once or twice a week for an hour to maintain the battery. This is not consistant with other Subaru's and other vehicle I have owned and I remind you that this is a brand new battery. In looking online I did notice there have been some complaints about the battery and charging systems drawdown above the normal levels. Subaru would not check the drawdown level of the vehicle.
Battery went dead had it charged - went dead shortly after. Replaced battery and within a year of replacing with a brand new battery it is dead again. Car was on side of the road where I parked it. There is a Class action suit on the battery life but if we need to keep doing this every year or so that is a problem. Called the dealer to see if there is anything they can do to alleviate the problem and they really have no answer. First battery lasted about 2-3 years Second battery lasted about a year and will probably go two with several jump starts along the way as was the case with the first.
Left town for 3 weeks and upon return the battery was dead. This happened the last time the car was not driven for several weeks, in Spring of 2020. A new battery was purchased at that time, even though the original battery was only ~3.5 years old. The current battery is only 2.5 years old and should be able to hold a charge for 3 weeks. Every time the car goes for an extended time without being driven, something in the electrical system drains the battery. Its very frustrating and time consuming to deal with.
Hello! We have a 2017 Subaru Legacy 2.5I LM that was purchased used in 2018. Since the purchase of the vehicle, we have had to replace the battery 3x. The vehicle cannot seem to hold a charge, despite frequent use. Neither the car dealership we sold the vehicle to nor the Subaru dealership can seem to figure out what the issue is, however, it does seem to possibly align with this vehicle having battery charge issues. Feel free to connect for service records or additional info.
Repeated failure to start due to dead battery. Original battery replaced and replacement battery continued to die 2 or 3 more times. $250 electrical testing by Subaru specialty shop found nothing out of spec. Two American Automobile Association service calls found nothing out of spec. Concerned about getting stranded when traveling outside of your home area. No warning lights during drives prior to battery failing to start car. Most recent failure was in September, 2021.
Battery is draining and going dead even though battery and starter are new and battery is good. Needs to be jumped to start randomly, leaving me stranded. Has been happening for over a year despite battery replacement and starter replacement. No warning lamps or messages prior to failure, just won't turn over. Understand class action saying its a software problem, but Subaru never contacted us to correct this. Last time it occured is listed below
Electrical complaints in other Legacy years
Frequently asked questions
How common are electrical problems on the 2017 Subaru Legacy?
NHTSA has 30 complaints about the electrical system of the 2017 Subaru Legacy, 25% of the model year's 119 complaints. The component named most often is ignition (1 mentions).
Is there a recall for 2017 Subaru Legacy electrical problems?
No. NHTSA lists no electrical system recall for the 2017 Subaru Legacy, though it has 2 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2017 Subaru Legacy electrical problems start?
Half of the complaints with a recorded mileage happened before about 54,000 miles, and 29% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 1 fire and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.