2017 Subaru Forester: battery drain or dead battery

Filed Mar 12, 2026 · Driver assistance · VA

My 2017 Subaru Forester Touring (VIN: [XXX] , 118,200 mi) has a recurring EyeSight failure where the system becomes disabled and will not complete camera registration or calibration. Subaru of Sterling (VA) diagnosed active code B28A0 “Vehicle Model Judgment” and noted that the EyeSight stereo camera would not accept vehicle model registration. The technician documented: “Error for camera adjustment incomplete. When attempting to relearn UI for Eyesight camera, system is not taking vehicle registration; suggests camera replacement and perform recalibration.” This occurred after a confirmed DCM/STARLINK parasitic draw had caused repeated low‑voltage conditions until the dealer reset the DCM to factory mode (per the RO: “No further draw present at this time”), suggesting EyeSight registration may have failed due to prior voltage instability rather than true hardware failure. Subaru's service flow for B28A0 indicates this code can occur when the model write/registration is incomplete, interrupted, or mismatched—not necessarily when a camera has failed. Subaru lists causes such as: CAN communication issues, incorrect model registration, incomplete write due to ignition timing, or power/fuse issues during aiming (EyeSight diagnostic manuals). I am reporting this to the federal safety agency because EyeSight is a safety-critical system that governs adaptive cruise, lane keep assist, and pre-collision braking. My dealer is recommending camera replacement without documenting that Subaru’s required pre‑replacement steps (model registration inspection, CAN/LAN re-scan, voltage and fuse verification, genuine-part verification, etc.) have been completed. I request ODI review because EyeSight should not fail to register unless hardware is defective or a procedural/voltage issue exists. I want this documented in case this represents a broader pattern of EyeSight registration/calibration failures on Forester models using the same stereo camera platform. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 2, 2025 · Driver assistance, Electrical · MD

Two incidents happened first battery died, we replaced the battery. Then Battery died again, we replaced the alternator on June 5, 2025. Then on Saturday September 13, 2025; all system lights came on at once on the dashboard then the battery died again. Car locks up and is stalled out. Cannot restart car, has to be towed. We replaced the battery cable and cleaned the terminals. Three months later, December 1, 2025; the battery light came on then all system lights came on at once, the battery died again. This happened on Interstate 95, it could easily have caused a crash. Car locks up again and is stalled out again. Cannot restart car again, has to be towed again. Something in the electrical is causing this, we do not know what.

Filed Jun 10, 2023 · Electrical · NH

I have a 2017 Subaru Forester 2.5i touring that seems to be plagued by a parasitic battery drain issue. I bought the car used in 2019 and successfully moved from Seattle to the Boston area in it shortly after the purchase with no issues. The dead batteries started during the pandemic, when the car was sitting undriven for extended periods of time. I’ve had the battery replaced multiple times, most recently in January of this year with a Diehard (3 yr warranty), and yet, once again, the car is dead and I had to call AAA yet again today. I'm at my wits end and cannot afford to continually purchase new batteries over and over again. My online research has produced dozens and dozens of stories about Subaru knowing about this parasitic drain and not admitting wrongdoing. I even found a class action lawsuit. Some folks online have reported having a mechanic who was able to diagnose which component was causing their drain … not always the same component all of the time, however. Most recently, I read it was the DCM causing the issue. At any rate, I don’t have the technical expertise to mitigate this, so I’m looking for a mechanic who can successfully diagnose where my particular parasitic battery drain is coming from.

Filed Apr 22, 2023 · Electrical · WA

We're having to consistently jump-start a battery that is only 4 months old. The problem has been consistent over the years (currently on our 3rd battery in about 5 years) but appears to have worsened after a DCM update to the Starlink system. Dealership has assessed the problem as parasitic battery drain (while the car is turned off) from the telematic module, but refuses to correct the issue.

Filed Feb 3, 2023 · WI

Constant battery jumps from friends and towing companies. Car is now dead and in driveway. No other vehicle. Senior citizen living alone. Also, rear gate does not open at all at times to get into trunk area and does not close fully which also leads to battery drain. Was told yesterday that a new gel battery to replace is $500 and they do not have in stock.

Filed Dec 9, 2022 · NY

My battery was replaced in May 2021, I bought the car in July 2021. I was never notified that there was a battery problems with the 2017 Subaru Forester's when I purchased my car and I just had to replace the battery today December 9, 2022. I called Subaru and was told that the settlement was only good for 60 days from the action date of September, 2022. So, this this problem could be very serious if not addressed going forward. The car probably should not be on the road if the battery drains that quickly.

Filed Aug 29, 2022 · Electrical · MT

If you do not start the car everyday, the car drains the battery. Car must be jumped.nothing left on. It has a battery drain problem.

Filed Aug 12, 2022 · Electrical · AZ

Battery drains if not driven approximately every 5 days. We have replaced battery three times. We’ve asked the local Subaru dealer a couple of times why the battery goes dead so quickly. Their response it’s a known issue. Not good that whenever we park the car or take it out of town we have to take a battery charger with us. This includes manually unlocking doors, climbing over back seat to get to the charger.

Filed Aug 1, 2022 · Electrical · TX

2 new battery drains dead just sitting in the driveway.

Filed Jul 21, 2022 · Electrical · ME

There appears to be a parasitic battery drain in the vehicle when it is stopped and all electrical systems are off (lights, heated seats, chargers etc) but the key is in the ignition. The most recent event was 7/20/2022 when the car was stopped for fueling and the key left in the ignition for no more than 10 minutes. Battery discharged sufficiently in that time that the car would not start requiring roadside assistance. Spoke with dealer who stated to keep the key 30 feet from the car (note, this is NOT a smart key car) and to ensure all is off as all computer electricals will continue to run even with the car off. Will be having a battery test next week but I see that this is a recurring issue for this make/model on this forum. The same problem happened in December 2021, although at that time the weather was also severely cold and the key was in the ignition (all electrical systems off) for approximately 45 minutes. The issue is one of personal safety and being stranded in a vehicle which cannot be moved (steering and transmission locked due to low/no power) as well as cost in time and money to investigate and remedy the issue. It is also an issue of functionality and usability. If I cannot leave the key in the ignition with the car off, I am unable to use any accessories or even my safety flashers in the event the situation would warrant it.

Filed Jul 18, 2022 · Electrical · WY

We have had issues with the battery draining since early on in owning the car. First the power windows stopped working and they replaced the battery. We are now having more battery issues and the care is in the shop.

Filed May 7, 2022 · Electrical · IL

Purchased July 2016. Battery has failed to start car several times requiring a jump-start. Battery has been replaced 4 times (09/'18, 01/'19, 06/'19 & 03/'20). Currently vehicle is in shop for extended attempt to find source(s) of "parasitic" drain. Dealer reported aware of problem with certain Subaru models. A class action lawsuit has been initiated. Computer updates have over the years have not helped. This problem has the potential of stranding us when on a trip.