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

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

Comments

Adele Hoiseal (not verified)    August 31, 2024 - 2:06PM

I have a 2021 Forester Touring
I had to replace my starter 4 months ago. I had about 46,000 miles on my car. I was on a major highway turnimg left. Not good Many tries it worked. Took to my
Dealer replaced the starter.

Karen (not verified)    August 31, 2024 - 2:52PM

"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." This is absolutely not the case with my 2021 Forester. I guarantee you I'm not keeping the inside of my car at 90-100 degrees here in the summer, and the car regularly auto stops if I forget to disable it every time I start the car. I'll also echo the concerns about the stopping causing safety concerns when I need to move quickly from a paused position and that it has on several occasions caused the whole car to shut down and have to be put in park and restarted--not safe.

J Bass (not verified)    August 31, 2024 - 3:02PM

I have a 2023 Outback. The feature is annoying due to the effect it has on the steering wheel. At times, when the engine starts automatically, it will literally jerk the wheel out of your hands. This is shocking and sometimes painful. I wish I'd known how aggressive it was before I bought it.

brian (not verified)    August 31, 2024 - 11:52PM

In reply to by J Bass (not verified)

I have a WRX so it's not an issue with my car however I hated it when car I was renting ??? did it only once. I quickly found if I just pressed light enough on the brake to keep car from moving it wasn't able to engage the feature, problem solved.

Ryan (not verified)    August 31, 2024 - 11:54PM

In reply to by J Bass (not verified)

Don't know if this work on all Subarus, but a trick to keep the engine from turning off is this: do not fully press down on the brake pedal. Press down just enough to stop the car, but not all the way down. The engine will not turn off. Press the brake all the way down, and it turns off. You can control it this way.

Wilbur W. (not verified)    August 31, 2024 - 4:12PM

I really dislike the auto start/stop on my Outback. Whole car shutters n sometimes steering wheel even jerks a bit. Can't wait until my lease is over n I get something different. This is our 4th Subaru, but will be our last. Should be an option I don't have to turn off every time.

Greg Cary (not verified)    August 31, 2024 - 5:16PM

I turn off start stop as soon as engine turns over. For the wear and tear it puts on battery starter and engine it's not worth it to save some gasoline and emissions.I also read whether true or not that start stop could be causing more problems.The TCV which has a design problem anyway could be breaking down sooner with what was called pooling.Whatever not worth it to me I hate it

raph (not verified)    August 31, 2024 - 7:03PM

I like it. I had the car for a year and the counter shows it turned off the engine for over 7 hours now. For me that's a significant enough environmental saving. I will disable the auto-stop sometimes when stuck in slow moving traffic coming to a halt too often, but otherwise I leave it on. When you're used to its behavior, it's easy to get ready to move and I don't feel like I'm losing a lot of reactivity. It's a outback, not a race car 😅

Dave (not verified)    August 31, 2024 - 10:17PM

The auto stop start feature has to be creating more wear and tear on the starter. If companies mandate this stupidity, then the starter should have a lifetime warranty.

gilbert brown (not verified)    August 31, 2024 - 10:21PM

i agree!!!
auto stop/start should not be default feature, it should be an option to turn on, if desired.
another "feature" is TPMS. it cannot be turned off and if it fails [inevitably will], it is an expensive excercise to get it running again!

Janet Winterton (not verified)    August 31, 2024 - 10:31PM

I bought 2020 xv Subaru new. It has A button, I always use the button. I would check the next Subaru made sure it has A.
Thank you

Robin (not verified)    August 31, 2024 - 11:17PM

I have a 2015 Forester, and I try not to use the Stop Start function for a short stop. It can be very sensitive though, and hopefully the newer models have an improved system that works for the driver.

Jon (not verified)    September 1, 2024 - 7:59AM

I intensely dislike the start/stop feature. It is noisy, uncomfortable and shakes the car when restarting.

I do not believe it saves significant fuel. Thank God, it can be turned off either by pressing the dash button, navigating the menus or turning on the rear defroster.

I would like to take the idiots who dreamed up this feature and drown them.

Deb Hanner (not verified)    September 1, 2024 - 12:03PM

Just got my Crosstrek a few weeks ago. I didn't think I would like it. But honestly, I did save almost a gallon if gas on the first tank. So, I guess it does work.

Terry Hand (not verified)    September 1, 2024 - 1:03PM

I don't like the start stop feature on our 2019 Subaru Forester. The obvious problem is the jerk you get when it turns on. Many times it stops and starts when I am at a red light and my foot is on the brake. The dealership had no clue why it does that.

David Gladu (not verified)    September 1, 2024 - 2:24PM

I have a 3year lease on a Subaru forester. I have to have a portable jump start because the start stop future drains the battery so the car will not start again.
I talked to a service rep and he told me that the next time it happens I need to call Subaru road side assistance and have them come and tow it to the dealership.
This is something that is impractical because the dealership is over 50 miles away.
I do not have time to wait for an hour to have them drive up here and tow it down to Datona beach just to find out I need a new battery. the Battery I can only imagine would cost over 100 dollars.

Alan MacRobbie (not verified)    September 1, 2024 - 3:09PM

I have a 2024 Impreza with 2.5 liter. I always touch the icon you mentioned in the article. I live in the country and traffic moves well through the small city and villages in my area, so I prefer to keep the engine running.

Tom Hamilton (not verified)    September 2, 2024 - 11:27AM

I have a 2021 Subaru Forester Limited with auto stop technology. Last year (2023) I had to have the original battery replaced do to cells were dying and not putting out standard power. I asked Subaru maintenance specialist what causes to replace the $450.00 battery. I received an answer that I have been using too much auto stop system where it wore out the battery.

Delbra Howard (not verified)    September 2, 2024 - 9:56PM

Hi Dennis,
I drive a 2020 Forester Subaru. I purchased it a year ago.
What is the best way to keep it working at top performance?
Who else can service my car other than Subaru?
Thank you for the information.
Delbra

Fred (not verified)    September 3, 2024 - 8:01AM

The auto start-stop system is garbage!! I stop at a stop sight and then need to get out into traffic and I step on the gas and nothing happens. To me this hesitation is very dangerous! You should be able to switch the system off permanently.

Glenn (not verified)    September 3, 2024 - 11:01AM

My concern is engine wear with oil draining out of the engine to the pan during stop cycles. Could this increase extra wear of the engine?

Laurie paicer (not verified)    September 3, 2024 - 10:22PM

I don’t like this feature at all. The car has “choked” a number of times essentially stalling out. This forces me to shift into park, turn off ignition and restart the engine. The car also struggles intermittently to actually restart even when operating normally. This has been looked at several times at the dealer and it never happens on the test drives. So I turn it off every time I start the car

Greg Davies (not verified)    September 4, 2024 - 2:16PM

I always turn off this feature. It's relatively clunky and can thrust my '22 Outback forward at stop lights. It's very annoying. Considering how clean and efficient combustion engines are now, I'm not concerned about the minute reduction in emissions.

Gale (not verified)    September 5, 2024 - 10:58AM

I love my 2019 Subaru. The start stop shut off does not bother me. I looked at my gas gauge and notice the gas went up. Now I know why, that is the first time I saw this happen or I should say noticed.
My mechanic told me to shut it off because it could eventually have problems with the alternator ??

Nan O. (not verified)    September 6, 2024 - 1:45PM

I have had my 2020 Forrester for 18 months. I like everything about it - except the auto-shutoff feature! Because we live in a traffic congested area of Florida, our travel is stop and go. When I am waiting for the light to change I allow the car to creep forward just enough to restart. Then the engine will idle until the light changes. I would not hesitate to purchase another Subaru, but the shut-off is irritating.