2021 Subaru Forester Electrical Problems

Your Subaru's auto start/stop feature has shut off your engine completely while driving without warning, displaying an EyeSight error message and forcing you to restart. This happened twice — once during a left turn in traffic and once in stop-and-go conditions — creating dangerous situations where following drivers had no warning your car was stopping. The dealer replaced your battery but couldn't reproduce the problem, and Subaru has not provided a solution despite your safety concerns.

Your engine has shut down unexpectedly four times while sitting in traffic, requiring you to restart it manually—including one incident near a railroad crossing with your child in the car. You're also experiencing forward lurching at low speeds and hesitation when accelerating after stopping. These issues have continued even after service visits, and you believe they may be related to known problems with the Auto Start/Stop system and battery that Subaru has documented in technical service bulletins. Fixing this will likely involve software updates to the engine control system, battery diagnostics, or replacement of battery components.

Your car caught fire shortly after you parked it at home. Before the fire, you noticed a low humming sound from the speakers and the car was slowing down on its own without you pressing the brake pedal. About 10 minutes after parking, smoke came from under the hood, followed by flames that engulfed the entire front of the vehicle. The fire was severe enough to melt the hood and damage a nearby tree. The cause has not been confirmed by Subaru or an independent mechanic, but given prior infotainment system issues and a warranty extension Subaru issued for known problems, an electrical failure may have ignited the fire.

Your car's automatic start/stop system sometimes fails to turn the engine back on after stopping. You've taken it to the Subaru dealer multiple times, and they've replaced the battery, replaced spark plugs, and updated the transmission control module software, but the problem keeps happening. Even Subaru of America is aware of the issue and hasn't found a solution yet.

Your car is draining its battery rapidly—you've already replaced the battery three times at 45,000 miles and been told you need another. The dealership says the start-stop system is the cause and recommends using a higher-capacity battery (750 CCA) than Subaru officially specifies. Additionally, your driver's seat adjusts itself to different positions on its own, and the car may stall while driving in traffic.

The Auto-Stop/Start feature frequently fails to properly restart the car, often causing the car to stall during the restarting process, leaving me effectively disabled on a busy road. The battery has already been replaced once.

My vehicle is equipped with automatic start/stop system. In early 2024, I began having issues with sluggish restart during the start/stop cycle. I took it into the dealer at that time, who stated it required a software update and charged the battery. The issue persisted. It was more serious, as it was not just sluggish on the restart, but the restart would fail and stall the car. This happened in heavy traffic, which was very scary and unsafe. I took the vehicle back into the dealer in late 2024 for the same issue. They did another software update and charged the battery again. They recommended that we purchase a new battery. One month later, we purchased an upgraded AGM battery, as it was recommended for auto start/stop systems. The issue continued to persist. First, with sluggish restart. Later, the auto start/stop system failed again in heavy traffic. We took the vehicle in again, and again the dealer stated it was the battery. They recommended we purchase a new battery. It was explained the battery was 6 months old, and the issue has never been fixed. Further, it was pointed out that the car could be restarted manually with the push button ignition, after a start/stop system failure. That led us to believe it was not a battery failure, but a deeper system failure. The dealer continues to assert it is the battery, even though it happened with a factory battery and a new, upgraded, battery. Neither of the batteries have failed testing, and report as "good" on the diagnosis forms. We believe there is a system issue, that is causing issues with the auto start/stop system, and is not being identified by the dealer. It is a safety issue, as it has happened in heavy traffic several times. We have attached diagnostic reports from March 2024 and June 2025, but cannot find the October 2024 diagnostic report.

The automatic shutoff that occurs when the vehicle stops to prevent idling, disengaged two separate times in the span of 4 days. Both incidents occurred at very busy intersections and failed to restart both times. When attempting to restart the car, lights came up on the dash, along with beeping, and failed to restart the car after the light had turned green. To restart, the car had to be completely turned off for about 60 seconds and then could be restarted. To avoid having to experience this issue again, or worse - get into an accident - I took it to the shop where they could not recreate the issue.

Without any prior issue of having the engine turnover from being parked for more than 20 hours, the car would not start. It’s like the battery completely died overnight. I was able to unlock it but the car would not start, and therefore was unable to go into neutral because I didn’t have a long enough screwdriver with me to manually override into neutral. So it had to be jumped partially to be towed (had it towed for more than just the battery because it’s under warranty). The interesting part is that my car has a factory issued battery, and my car was the third Subaru made after 2020 that had to be towed due to the same issue, in the same day. Maybe the batteries are defective? Regardless, since everything relies on power now, having a provided device to allow for manual override would prevent folks from being stranded. I tried using my key AND the screwdriver that comes with the spare tire. Both were to short.

My dealer diagnosed issues with my car as: the gasket around my sunroof failed and allowed water to infiltrate the cabin and the electrical system over time. This caused corrosion in the electrical harness, which caused battery failure, failure of the adaptive headlight system, and random electrical glitches. My interpretation of their diagnosis was that this was a cascading failure that might have led to problems with other electrical components such as power brakes, other adaptive systems, etc., and affected safety, if it had not been diagnosed in time. An insurance appraiser confirmed the dealer's diagnosis. Repairs (including replacing the electrical harness) have been completed and so the situation is not available for further inspection. When the adaptive headlight system stopped working, this was reported on the dashboard, but the cause of this and the base problem was not.

1. The car shut off several times, with the steering wheel locking up and becoming stiff, the brakes failing to respond, and loud, erratic sounds emanating from the vehicle. The car is available for inspection. 2. Yes, the car crashed resulting in damage to the car, driver, and other driver (e.g. car in front). 3. This is the second time the car has been brought to the dealership (the second time being Subaru South Hill in Pennsylvania) and they cannot identify the problem. 4. The vehicle was not inspected by police, or insurance, as far as I am aware. 5. There were no warning signs before the failure.

MY 2021 Subaru Forester battery has died twice in the last 10 months. I could not jump start the vehicle the first time about 10 months ago. I needed AAA to jump start it. I took the car to the dealer; they recharged the vehicle and said the battery was fine. They did not bill me. The car died again this week. This time I was able to jump start the vehicle myself. The safety issue is I might need to get to a doctor's appointment or other emergency in a hurry. I may be out shopping or hiking and need to return home, perhaps in bad weather. I might be stranded in a busy intersection or a lonely country road. The battery is simply not trust-worthy. The vehicle was inspected by the dealer, and they said the battery was fine. There was no warning lamp before the battery failed. The car is not safe-I don't know when it won't work.

12/14/24-I was stopped at a red light at a VERY busy intersection. The engine was in stop mode by the start/stop feature. When the light turned green, the car failed to start. The entire car shut down, with alarms sounding and dash lights flashing. The entire system had to reboot before I could restart the car. It was a freighting experience. Fortunately, I wasn't killed by traffic zooming by or by some person with road rage. 12/16/24-Issue evaluated by local Subaru dealer. Their evaluation was that when the auto start feature was activated, my car battery was too low to work. There was zero warning about a low battery before this failure in traffic. I had to buy a new battery. The auto start/stop feature is not an enhancement, but a safety hazard. Owners should be able to permanently disable this unnecessary drain on batteries and starters. I did a search, and there are plenty of others that experienced similar issues with their Subarus.

The contact owns a 2021 Subaru Forester. The contact stated that while waiting at a traffic light, the accelerator pedal was depressed, and the vehicle immediately shut off. During the failure, the message "Eyesight Disabled" was displayed and the vehicle could not immediately be restarted. The gear shifter was shifted to neutral(N) and the vehicle was pushed to the side of the roadway. The vehicle was eventually restarted and operated normally. The cause of the failure was not yet determined. The local dealer was notified of the failure. The manufacturer was not yet contacted. The failure mileage was 37,000. The VIN was not available.

My vehicle starlink infotainment system does not work. This is a safety hazard because it prevents drivers from using their back up cameras and this car has many blind spots. This also frustrates drivers and causes distraction as navigation is not available. The screen display abruptly stopped working. I brought my vehicle to the dealer and their solution was to spend $1700 on a new infotainment system. Owners should not have to be paying to utilize safety features marketed for the vehicle they bought. There were no warnings prior to the system breaking.

Vehicle auto start stop feature sporadically fails to start vehicle after stop feature stringers. Happened on multiple occasions, at red light, at stop sign, on freeway during traffic jams.

When I bought my car I was assured that it was impossible to lock the keys inside the car. Typically I put my dog in a special car harness and buckle him into the middle of the back seat. He's 77 lbs. and tall. It's a bit of a project to get him all set. I'm leaning over and all my stuff is hanging off of me so I drop my purse onto the floor of the back seat and put the car keys on the console between the two front seats so I can more comfortably deal with him. I do this from the right side of the car as the child car seat is on the left side. Once he's buckled in I close the door and walk around to the driver's side and get in. On Oct. 7th I had taken him to a park to play. The temps were in the 80s and my car was parked in the sun. He's a Bernedoodle and does not handle heat very well. I buckled him in as usual from the right side and also put the keys on the console as usual. Then I closed the door. CLICK! Uh-oh! All the doors automatically locked! With the car in the sun and the outside temps in the 80s I can only guess that the inside temp had to be well over 100. I almost panicked. I thought of calling the police, but here in Portland they are slow to respond if they even respond at all. I banged on all the windows and thought of finding a rock to break one open. Then I remembered that I hadn't tried the back lift up door as it's an SUV. Thankfully it opened. But I had to crawl in over all my stuff in the back, over my tall, 77 lb. dog, and stretch out to reach my keys on the console in the front. Then I had to back out. This was not easy; I'm in my 70s. I shouldn't have to do that! So [XXX] was okay in the end. What if it had been my two year old granddaughter? What if the back didn't open like the side doors didn't? It shouldn't be that way. I called Subaru and they said they never heard of that happening. They said there was a lock setting but I couldn't find it. They said the fob battery could be low but there was no warning. I'm bringing the car in. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

Purchased brand new from dealer. Less than 3 months later a tiny pebble came up and hit the center of the windshield, immediately you could see an indentation and a spider web. Now the whole windshield has multiple spider web cracks. The splits go from edge of driver's side all the way to edge of passenger side of the car. As well as 3 separate rings going around center indentation. Only had the car 3 months when this occured. Have had 3 instances that I could not start the car. Now the cigarette lighter charge port will not work. Moon roof malfunctioning and will not close sometimes when fully opened. Now I am having issues with the brakes sticking. It's 1 year old and this is way too many issues for a brand new car! Never again!

My windshield shattered when hit by a small rock that apparently came from across and bounced up and hit the windshield. Subaru does not replace windshields... so you have to get Insurance to cover. The wiring in a Subaru is attractive to rodents - what the wiring is made of depends on who you speak with - most common answer is Oat Based Covering. I have spent over $4000.00 to have the wring in the front and fuel area. This is a 2021 Subaru Forester with less than 12K miles. Subaru can not give a straight answer on material in the wiring and says I need to build a shed. There are 4 other vehicles at my location that are there 20 hours a day - I go to an office 5 days a week so my car is gone over 50 hours a week - still my fault!

The wiring system fails when the wiring - SOY BASED - is eaten by rats. SUBARU refuses to take responsibility for this. My car has less the 9500 miles and has had over $3500.00 work done to replace the wiring eaten by Rodents as this is considered "my fault?.

I have had the wiring in my 2021 Subaru Forrester having to be replaced 2 times - once in front of car, once in fuel parts - due to Rodents eating the wiring. I have been told by Subaru Customer Service staff that the wiring is Soy Based. Subaru has a Class Action Suite in Hawaii for this exact reason yet Subaru in Macon continues to insist this is MY problem not theirs. I have Rodent repellant devices in my car. I am very frustrated, upset with being misled and no concern for the customer being offered.

Several instances of parasitic drain of the battery resulting in vehicle not being able to be started without a jump. Nothing was left on in the vehicle. Each time it was parked with the alarm set for approx 3-4 hours. The battery was completely dead. This vehicle is only 8 months old and this has happened around 8-9 times. Dealer does nothing about it except to charge the battery. This is unacceptable.

The batteries drained overnight 3 times within 7 months after the purchase of the new vehicle. Battery was jumped each time by Subaru Roadside Assistant. The dealer checked the battery and it was fine. It is the electrical (CAN) problem that drained the battery.

I parked in the parking lot yesterday afternoon. But when I try to start my car this morning, the battery dead！I just bought this new Subaru three months with 5000 miles. Very disappointed.

ON MARCH 2, 2021 I NEEDED TO GET TO AN APPOINTMENT AND MY CAR WOULDN'T START, NOR WOULD MY FOB WORK TO EVEN OPEN THE DOORS. AFTER CALLING FOR ASSISTANCE THEY JUMPED THE BATTERY. THEN I BROUGHT IT TO SUBARU WHERE THEY DID A COMPLETE DIAGNOSTICS TEST AND FOUND THAT THE BATTERY WAS DEFECTIVE. I HAD BOUGHT THE CAR NOV. 25, 2020, ONLY THREE MONTHS BEFORE! THEY REPLACED IT WITH THE SAME KIND OF BATTERY. I WAS DISMAYED TO FIND THAT I HAD BEEN SOLD A NEW CAR WITH A DEFECTIVE BATTERY.

THE CAR IS TWO MONTHS OLD AND THE BATTERY DIED (NOTHING WAS LEFT ON)!