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Despite multiple attempts to diagnose the problem, the dealership has turned up no clues. Experts offer some options and background for the car’s owner to consider.
Q. Sometimes, when I take my foot off the accelerator and put it on the brake, my car, a 2019 Subaru Legacy 2.5i Limited, accelerates suddenly. It stops only with a hard push on the brake. After this happened several times, in February 2019, I took the car to the dealer and left it for three days to diagnose and correct the problem. The dealer could not find the cause, even after I went for a drive with their director of after-sales operations. His conclusion was that, inadvertently, my foot remained partly on the gas pedal when I transferred to the brake pedal because I was wearing heavy winter shoes. I was very doubtful but I had little choice but to accept this verdict.
I have driven very little—less than one tank of gas in the last 17 months—and did not have any more trouble until yesterday. When I came up to a traffic light, I experienced sudden acceleration again. Fortunately, my light was green so other traffic was stopped as I raced through the intersection.
This morning, the same thing occurred twice. The first was outside a store at a shopping plaza. As I stopped at the curb, the car suddenly sped up. I hit a signpost that fortunately was the type on a flexible stand, and was able to stop before running into a storefront. Later, as I turned into a driveway and put my foot on the brake to slow down before turning, the car suddenly raced ahead and I had to brake hard to get it to stop. I was happy that it was early in the day and no one was walking—otherwise, there could have been a terrible accident.
The Subaru dealer picked up my car to try to find the problem. They gave me a loaner car and have been pleasant and tried to be helpful. So far, they have not been able to reproduce the problem and are keeping my Outback one more day to try again. Apparently, they can’t help if they can’t get the problem to recur. Sadly for me, it seems to be unique to my vehicle. What are my options?
–F., Toronto
A. The number of incidents you have reported is extraordinary. Have you tried putting the transmission in neutral? Will the transmission accept the command in an out-of-control situation?
Your dealer’s inability to diagnose the issue is not unusual, as is their apparent failure to involve the manufacturer early on. The Automobile Protection Association received two complaints about unintended acceleration from Subaru owners, and a couple of class action lawsuits have been filed against Subaru over sudden unintended acceleration issues in the United States. One of the law firms alleges on their website that the cause is a conflict between the electronic throttle control and brake override that is not fully explained.
Like other modern vehicles, Subarus are equipped with an event data recorder (EDR), separate from the engine control module (ECM or sometimes ECU), that is supposed to capture situations in which a customer pressed on the brake yet the vehicle continued to accelerate. Subaru Canada has regional technicians with the training and electronic equipment to retrieve those codes, as does Transport Canada for most brands. This equipment and capability rarely extend to the car dealer, whose diagnostic equipment focusses on powertrain performance issues and emissions compliance, but not performance of the airbags, seat belt tensioners, or brake and throttle in the moments prior to a collision. All modern passenger vehicles record some information of this nature. However, dealers will not necessarily flag an event for their manufacturer to investigate; instead, it’s the unhappy vehicle owner who escalates their complaint to head office in an attempt to obtain those resources.
I reviewed your situation with Eli Melnick, an engineer and defect investigator for insurance claims who provided the following perspective on your situation:
“I feel for this guy but, crazy as it sounds, he’ll have to collide with something to trigger an event and enable evidence data to be downloaded. The dealer is trying but typically they won’t do anything unless they can experience the problem. Dealers cannot access the EDR. Even some Canadian importers once had to send the encrypted files overseas to head office. We can do it using an aftermarket tool and training. You need to know how to interpret the data—it’s pretty cryptic. In certain late model cars, we can even download video images from the front camera.”
If you haven’t already done so, you should report the incidents to Transport Canada, which will record your complaint. In the event of a collision, you could take matters into your own hands and retain an expert to check your vehicle if the manufacturer and dealership appear to have dropped the ball. The basic cost to look at a vehicle and download the data is $1,000 to $3,000. It’s time-consuming, and investigating defects is usually more expensive than auto-repair diagnosis. It’s also sometimes difficult to find an expert who is independent of the auto insurance industry and carmakers.
Most auto insurance companies are not interested in this sort of fact-finding unless the incident resulted in a large property loss or significant personal injuries. In that case, they may be interested in discovering the cause of the alleged event as a precursor to making a claim from the automaker. For damage limited to the vehicle, it’s usually cheaper and more expedient for them to consider the incident an at-fault claim by the owner. The vehicle owner, who may be desperate for clarity in the days after an unintended acceleration event like yours, usually has little influence on their decision.
Now, here’s some context:
If we were to invent the automobile today, it would be inconceivable to place the control that makes it “go” right next to the control that makes it “stop,” with both outside the driver’s field of vision. This legacy placement of the brake pedal was arrived at with a different perspective of vehicle safety. Early braking systems were not very effective and power-assisted brakes did not exist; brakes were weak and tended to “fade” if used repeatedly. Foot-operated brakes had a distinct advantage because the foot is at the end of our stronger limb, allowing the driver to exert more force repeatedly without tiring.
Years ago, one of the first questions the APA staff was instructed to ask consumers who experienced an unintended acceleration was: “Does your vehicle have aftermarket floor mats?” When a sudden acceleration is reported, that’s the first thing a dealership will look for. Even if the driver’s mat does not appear to be an issue, no repair expert will look further until the mat has been ruled out. So, the first recommendation when having experienced a sudden unintended acceleration incident is to check that there is only one mat in the driver’s footwell and that you have not placed a winter mat over the carpeted mat delivered with the car, which can increase the likelihood of interfering with the pedals.
Furthermore, original equipment winter mats from many automakers frequently have a retention system, usually one or two eyelets or clips to prevent the mat from sliding forward and interfering with the pedals; that’s a failsafe most aftermarket mats, which are designed to fit a variety of vehicles, don’t feature. And many original-equipment mats are now shorter than the aftermarket variety.
The most common sudden acceleration complaint involves one event, in which the driver just sat down inside the vehicle or had just rotated their body to reverse the car. The driver may have owned the vehicle only for a short while, and complainants skew toward owners aged 60-plus. Incidents are usually reported in parking lots, driveways, garage entrances and car washes. From the driver’s perspective, it feels like the brake pedal sank to the floor (as if the brakes failed), or that the pedal is not responding. The likely cause is applying the wrong pedal. It happens more often than most people think, and it doesn’t take much misalignment of the torso or legs to occur.
Carmakers addressed this possibility partly with the introduction of the shift interlock that prevents shifting an automatic transmission out of “park” unless the driver’s foot is on the brake pedal. But the shift interlock does not work when shifting between “reverse” and “drive,” nor while in “drive” when you shift your foot from the accelerator to the brake.
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Two weeks ago I experienced a bad case of sudden acceleration with my 2014 Forester as I was slowly turning into my own driveway. The vehicle speeded up and veered to the left side coming to a stop against the front brick wall of the house causing extensive damage. It was very sudden and shocking. The impact was huge so much so the car is written off by the insurance. Neither Subaru nor the insurance company are interested in investigating the malfunction. My foot was still on the brake while turning in the driveway. I just hope this does not happen to anybody else because it could have caused a fatality.
About a decade ago another company, Toyota, had a similar issue that caused multiple accidents and fatalities. They issued several recalls that did not quite fix the issue and hired experts, including engineers from NASA, to investigate the issue to no avail. Eventually through lawsuits, whistleblowers and government action Toyota’s coverup was exposed and billions of dollars in fines were levied against them. It shows how difficult it is to fix this issue when the automaker treats this issue like a PR issue instead of addressing the true cause of the issue.
I have this issue on a 2010 Forester. Here is what happens:
First, the Subaru is programmed to have rapid rise in torque for a small movement of the gas pedal. It’s in their drive by wire (no cable) mapping program. Look it up. There are actually aftermarket electronics you can buy to make response more linear. More normal IMO. Their depression vs torque curve makes car feel “sporty”, I guess??
Second, the brake pedal, compared to other cars I’ve driven is soft. More travel to get a response. Always has been, from day 1.
Third, the pedal placement seems weird. Seems a bit “left.”
NOW..when I wear a wide-sole running shoe, I rotate my forefoot from gas to brake. As I necessarily further depress the brake pedal (travel is long), the wide edge of the shoe catches the left edge of the gas pedal, and because it is SO twitchy, you get an immediate and hard forward lurch, as engine quickly revs. Several times I have traveled far enough to have caused a collision…had there been something there…before I exit panic mode and reposition right foot!
Trying to train myself to pick my foot entirely off floor and move ENTIRE foot, but old habits die hard. I don’t have to drive other cars this way. The other method is to plant my heel 2-3” left of what is comfortable (thigh is nearly under steering column) and drive otherwise “normally.”Was formerly my wife’s car, and is she learned to pick up foot vs rotate forefoot, and it became second nature. Does not seem to happen with narrower soled shoes. It is a SCARY thing! I believe, in the case of this model, it’s poor design and programming.
I had a similar experience, resulting in damage to my car and a business: On Sunday, August 20, 2023 I was pulling into a parking spot in front of an Anytime Fitness at a local strip mall. As I applied the brake, the motor raced and accelerated driving me into a pillar outside of the fitness center.
I was in shock, not understanding what had happened. Did I hit the accelerator somehow? Had I chosen to park one stall to the right, the car would have gone through the window of the business instead of the pillar.
Considerable damage was done to the pillar and to my 2021 Subaru Outback, but I was not injured, and no one else was injured. But now what?
I visited the local Subaru dealer manager and service manager and they explained that in order for the company to investigate what happened, I would have to have my insurance company agree to make a claim. IF Subaru agreed to investigate, an independent investigator would be assigned to the case. An internal ‘black box’ could be accessed giving the investigator data re: the crash. This process can take 4-6 months. During this time the car could not be repaired as the investigator would have to see the vehicle in its original damaged state.
So, six months without a vehicle. This system seems to be designed to prohibit concerned Subaru owners from proceeding with a claim. And what are my options? 1. Have the car repaired and continue to drive it with no confidence that the crash was a one-off and would not happen again, 2. Have the car repaired and sell it to be certain that I would not be driving a car that could at any time accelerate beyond my control, or 3. Choose not to repair, file a claim and live without a vehicle for 4-6 months.
This puts me in a very questionable position. I need a car; do I drive with uncertainty, or sell knowing that a new owner might face the same situation?
I must echo the experiences of Frances Caulfield and Cynthia Didion. On Sunday, October 23, 2023, I parked my 2014 Forester in front of a friend’s home to make a phone call. On completion of the call, I restarted the car and made an immediate sharp right into the driveway. The vehicle was barely crawling.. Suddenly, the engine accelerated. My friend, who was outside at the time, said it sounded like an Indie car. The car lunged forward and plowed into the back of an Audi parked in front of the garage forcing it into the garage door. My only thought in the split second when this was happening was “I have no control”.
Onlookers suggested that my foot must have slipped from the brake to the gas. But I couldn’t accept this explanation and when I began investigating today, not only did I find almost identical experiences, but coverage of a class action suit in the U.S. investigating “surge of acceleration without driver input”.
Within a day, I have learned that my insurance company is not particularly interested. Let’s settle my “at fault” claim and move on. It took some searching, but I finally managed to get through to Subaru Canada where I now have a case file with Tier Two support. I have no idea what will come out of that. And I had a very supportive chat with Transport Canada.
What surprised me is that Transport Canada has had no reports of sudden acceleration in Subarus. And yet I’m reading these posts…enough to know that there is a problem. I would suggest to anyone who experiences this problem, and in the process of “googling” stumbles across this site – call Transport Canada. Even if the event happened some time ago.
At the end of the day, no one was injured. My air bag didn’t even deploy. But two vehicles have been written off and a garage door smashed.
I just had to get rid if my outback. I had the exact same problems. I almost hit a sign at Lowe’s and almost ran into a daycare! The other day I was doing the same thing, pulling into my driveway, and it took off. Someone is going to be killed with these Suburus. Of course dealership could not find a problem saying they have never heard of this happening.