Subaru’s Worst Feature, Auto Stop-Start Truths Revealed

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Do you like the Subaru Auto Stop-Start system? If you said no, you aren't alone. My report reveals some truths and myths about the feature that may help change your mind.

It's Subaru's worst feature. 

You aren't alone if you are not a fan of Subaru's Auto Stop-Start system on the Outback, Crosstrek, Forester, and other vehicles. Most drivers dislike the auto/stop/start system that shuts the engine off.

I've covered this topic before here, but here is new information for Subaru owners that you'll find helpful. Thanks to Alex Prestigiacomo from Bachman Subaru for some of the information in my report. 

What is auto start-stop technology? 

Auto start-stop, or stop-start technology, is a vehicle feature that automatically shuts off and restarts the engine when the car stops and starts moving again. This innovative system not only reduces fuel consumption and emissions, but also contributes to a cleaner environment, especially in congested cities where vehicles often stop at traffic lights or in traffic jams.

The Auto start-stop feature reduces greenhouse gas emissions. 

The feature not only saves fuel but, more importantly, significantly reduces greenhouse gas emissions. According to the Battery Council International in the U.S. alone, it is estimated to save as much as 10 million tons of greenhouse gas emissions annually, substantially contributing to our environment.

In 2022, 65% of the cars sold had the auto start-stop technology, so it's here to stay. And more cars are coming with the new technology. 

Does the auto stop-start save fuel?

It saves fuel, especially if you live in an area with heavy traffic. 

According to a study conducted by the Society of American Engineers (SAE), turning your car's engine off is beneficial if it is going to be idling for at least seven seconds.

Within that range of time, enough fuel is saved to restart the car. So, fuel will be saved whenever the engine is shut off for over seven seconds. I know of one stoplight on my commute where I can sit for as long as two minutes. After a period of time, the fuel savings add up. Subaru has a unique dash feature that shows how much fuel you are saving. 

Are there situations where the auto stop-start does not shut off?

The auto start-stop has a sensor to determine if the ambient temperature outside the vehicle exceeds the temperature inside. If it is, the car engine will not shut off. The same is true in the winter. The car will stay running if the outside temperature is colder than the cabin.

Or suppose your engine is only partially up to its normal operating temperature. In that case, the auto start-stop will not shut off the engine until it does reach the correct operating temperature. 

Will I lose the use of my car's cabin features with the engine shut off?

You still have full access and use of all your cabin features when the engine shuts down, such as radio, navigation, and other electronic technology.  

Does the auto stop-start system cause excessive wear on the starter and battery, which could cause reliability issues?

As with any technology, the components of the Auto Stop-Start system are continually being improved, ensuring its reliability and performance. Subaru is committed to providing a dependable driving experience. 

Subaru has one of the largest OEM batteries on the new Outback, Crosstrek, Forester, and other models. It can handle the extra load when the engine is shut off to power your lights and electronics inside the vehicle. 

Subaru vehicles have improved starter motor capacity compared to models without the auto stop-start technology. The starter shouldn't wear out sooner. 

I recently reported that Subaru has significantly improved the Auto Stop/Start feature on the next-generation 2025 Forester, which will surely please potential buyers and current owners.

The 2025 Forester is powered by an updated version of Subaru's 2.5-liter, four-cylinder Boxer engine. It now produces 180 horsepower and 178 pound-feet of torque. 

Subaru says the engine produces more power at lower rpm, making it quicker off the line. Essential engine parts have been updated to make the engine more efficient, reliable, and lighter—the auto-stop/start is one of them.

While Subaru has not publicly announced the improvement of Forester's new auto stop/start system, a report from Automotive News reassures us, stating that "The stop-start system is barely detectable." This news will surely bring relief to current owners. 

Can you shut off the auto stop-start on a Subaru?

Yes, you can temporarily shut off the auto stop-start system. On your touchscreen, there is an A icon with an arrow circling it at the bottom of the screen with a green light. If you tap the icon, it turns the auto stop-start system off. It's important to note that the system has a default and automatically resets when you turn off the car.  

Which Subaru models do not have the auto stop-start?

As of the 2024 model year, the Subaru Ascent, Subaru WRX, and Subaru BRZ do not have the technology. All 2025 Outback, Forester, 2024 Crosstrek, Impreza, Legacy, and Solterra models have the technology. 

Look for Subaru to improve the next-generation Outback's auto stop start system, which will be in 2026. Stay tuned. 

Let us know your opinion on Subaru's auto stop/start feature. Do you dislike it or live with it? Click the red Add New Comment link below and let us know.

I am Denis Flierl, a Senior Torque News Writer since 2012. I’ve invested over 13 years in the automotive industry in a consulting role, working with every major car brand. I am an experienced Rocky Mountain Automotive Press member. You'll find my expert Subaru analysis here. Follow me on my X SubaruReportAll Subaru, WRXSTI, @DenisFlierlFacebook, and Instagram.

Photo credit: Competition Subaru

I just installed an auto-stop eliminator in my '25 Forester. It prevents the feature from turning back on each time you start your car. It took less than ten minutes to plug it in. No more annoying judder and hesitation when I step on the gas. Recommend highly.

Submitted by Joe Barone (not verified) on August 30, 2024 - 11:31AM

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Hate auto stop start on my 2021 Outback Touring XT. Car shutters when it starts. Annoying and I turn it off as soon as I get in the car. Wouldn’t mind it if it was quiet and non invasive. Subaru needs to clean this up especially in new models with hybrid tech.

Submitted by Vincent Filteau (not verified) on August 30, 2024 - 11:37AM

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There are 2 ways to turn this feature off.
The button on the dash and an option embedded in the settings. Why the embedded option makes no sense. The vehicle has to be stopped but the feature turns back on after the next time the ignition shuts off. The latter function takes longer to complete and serves no purpose. It's totally useless.

Submitted by Dan Martin (not verified) on August 30, 2024 - 3:32PM

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The auto stop/ start feature is not valuable on my 2021 Subaru Crosstrek Limited. The problem is that the expressway is about two miles away and has only one stop usually with no traffic. If I have to stop then the engine usually stops too however briefly that may be. There is almost no stop that lasts longer than 7 seconds. I have been conditioned to press the off button on the lower left-hand side of my dash to turn the system off. I wish all of the on/ off buttons were on the display screen. Once on the expressway, there is only one more stop, and again, there is no traffic. If I could disable the start/ stop feature permanently I would.

Submitted by Crawdad (not verified) on August 30, 2024 - 7:28PM

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Auto start/stop is generally the most worthless feature of my Forester. It should default to Off, requiring someone to turn it on.

Pretty well negates its use and its so easy to turn off, I don't see the irritation being relevant. If I had my druthers I would have degrees of it and I would elect to make it shutoff in cooler/cold temps and warmer/hotter temps.

Alternatively you can just put it in neutral and it won't shut off but the Turn off button is slam dunk easy to use.

Submitted by Andy (not verified) on August 31, 2024 - 12:33AM

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My question is for the turbo which I always was trained to know the running in order for the turbo to cool down after being driven for a certain amount of time on the freeway. Please address this thank you

The advice for Turbo was more relevant when cars (vs diesel engines) got Turboed and yes some had issues. That was back in the 80s (SAAB being the first I believe). A trubo that is under a lot of load (uphill) may still have an issue, but on a Freeway you are not using max power (your fuel mileage would be below city driving if it was). Also, you don't just yank off a Freeway and shut down (short of an emergency). So you take an off ramp, hit a fuel station close by. By the time you have got there the Turbo has cooled down. If you are on a Freeway, climb a steep long hill and then pull off into a rest stop, give it a minute of idling but otherwise, as long as you have had some cooling down time its not an issue.

Submitted by Robert Caminiti (not verified) on August 31, 2024 - 1:45AM

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I own a 2018 Subaru Outback and the stop/start is a deal breaker for me to purchase a new Outback in the future. I plan to purchase a 5 year bumper to bumper warranty after my 7 year warranty expires later this year. This stop/start is nonsense and justifies the government’s plan for the Green New Deal that they’re doing something to protect the environment. It doesn’t do that much as they claim, but it’s just another annoyance for drivers!

Submitted by Tom (not verified) on August 31, 2024 - 3:09AM

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It's not just the starter life I'm concerned about. Every time a car is started, the piston rings and crankshaft journals are producing friction and thus wear until oil pressure is restored. Granted its not as bad as a cold start, but why add to engine wear to save a few drops of fuel/emissions? And I'm not buying the claim that the supposedly beefed up starter can take it. Not to mention it's just plain annoying.

Not true. There is a film of oil on all parts and it takes days for that to dissipate and a long time before its really gone otherwise your regular starts would grind. I worked on Standby Gen sets, those started at 1800 RPM (required to get 60 hz) and we never had an issue in a weekly start despite that being a bit less than optimal oil wise (some have pre oilers, ours did not). Dirt is what kills an engine, not starts and stops.

Submitted by Rich Eubanks (not verified) on August 31, 2024 - 3:36AM

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I don't own a Suburu but my Bronco Sport has this feature and I hate it. Not only is it going to wear out the starter, it's dangerous. The hesitation, in some instances, could cause an accident. It's like when the ABS brakes first came out in the 80's. That hesitation did cause accidents.
And, not only accidents, if your battery goes bad and you get a jump to start it so you can drive to the shop, you might just be stuck at a traffic light when it shuts off.

A lot of what iffs that apply to all systems but its so easy to turn off that if you are dealing with a low battery (and managed to get it started) then turn the auto off OFF and its not an issue.

The only accident it remotely could cause is being hit from the rear and do you really pay enough attention to that you would benefit from it? I did on a cycle once but cycle drivers are paranoid (and for good reason, they are after you if only by being oblivious).

At least on a Subaru if you don't like it you can turn it off (or get a Hybrid and the pedal kicks in the elecric drive)

Submitted by Dale (not verified) on August 31, 2024 - 5:01AM

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I left my start/stop on while driving around town. At the end of the driving I had saved 1 tablespoon. Underwhelming

Submitted by CG (not verified) on August 31, 2024 - 6:49AM

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Dangerous feature. In my combo of roads there are 2 intersections I have to pull out in from side streets and when I forget to disable there are close calls or at least nasty interactions that you'd like to apologize to the other drivers for. 1 second = 88ft at 60 mph, and that's several car lengths of getting things wrong.

Submitted by scotchbreath (not verified) on August 31, 2024 - 7:05AM

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The car's fuel economy improves by about 5 miles per gallon, which Subaru should not advertise as the car's standard fuel efficiency if this feature is the only factor. Without this feature, the Subaru gets incredibly poor gas mileage, even though it starts as one of the least fuel-efficient vehicles on the road. This is also an extremely dangerous feature, as it can shut off when you need to merge. Additionally, it sometimes shuts off unexpectedly, causing the entire car system to malfunction. I want a car that works and doesn't contribute to higher emissions.

Submitted by Jeff (not verified) on August 31, 2024 - 7:28AM

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I hated it on my 2021 Legacy Touring XT. The car would shake noticeably every time it restarted. I've driven a number of other vehicles with it and Subaru's was the worst. I always turned it off. My current car is a 2023 Hyundai Tucson and it's auto stop/start feature is smooth enough I leave it on.

Submitted by Gregg (not verified) on August 31, 2024 - 8:17AM

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I kick myself whenever I forget to turn off the auto stop/start function in my 2023 Forester. I cross shopped several brands prior to deciding on the Subaru. I knew that others, such as the 2024 Mazda CX-5 (my second choice), did not have auto/stop start, but I hadn't imagined that I would loathe it as much as I do. They should make it an option.

Submitted by Gary B (not verified) on August 31, 2024 - 8:19AM

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I find it very annoying when pulling into my driveway and the auto stop/start shuts the engine off before I've had the chance to shut the engine off properly. It then restarts if I slightly remove pressure on my brake pedal only for me to shut the engine off half a second later. I also don't like how the vehicle shakes every time the engine restarts.

Submitted by Ellie Rhodes (not verified) on August 31, 2024 - 8:50AM

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Had it in a loaner from Subaru and absolutely hated it. I’ll try to keep the old Forester running.

Submitted by Jack (not verified) on August 31, 2024 - 9:42AM

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You said:
"The auto start-stop has a sensor to determine if the ambient temperature outside the vehicle exceeds the temperature inside. If it is, the car engine will not shut off. The same is true in the winter. The car will stay running if the outside temperature is colder than the cabin."

According to this, it only works when ambient temperature and cabin temperature are equal. I think you were given some misinformation.

Agreed, the temp outside does not affect whether the auto start kicks in or not in my '24 Crosstrek. In fact, if I don't turn it off on the touchscreen, then when the engine shuts off at a red light it also shuts off my AC. Just the fan blowing ambient temperature air, which really sucks in August. I've only had it 5 months so I can't comment yet on heat use in winter. Pressing that button is quickly becoming part of my startup movements.

I can say from having a 25 Forester that is not correct. Cooler temps and its disabled, you can see it on the dash. I assume true for warmer temps. Idea being to maintain cabin at select temp.

Submitted by Kevin (not verified) on August 31, 2024 - 9:54AM

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I have a 2020 Forester and I absolutely detest the stop-start feature. The first thing I do when I start my car is turn that feature off. I don't believe that it does not wear down the starter since I already need mine replaced. The cost of replacing my starter is far exceeding the pennies I've saved in gas. I've been searching for a way to permanently disable this feature but haven't had any luck yet. If anyone knows of one - please let me know!

Submitted by Gus Pla (not verified) on August 31, 2024 - 9:54AM

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Annoying doesn’t begin to describe it. It is a horrible system, the car shudders and lurches forward when restarting. I always disable it as soon as I start the car.