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Discussion Starter · #1 · (Edited)
I had the most unpleasant experience to date happen last night in this car. I was on my way home with dinner and came to a busy 4 way stop near my house. The engine cut, like it always does, when I came to a stop and waited for my turn. My turn came, took my foot off the brake and hit the gas- nothing. Looked down and a message was coming from the top-center of the drivers screen saying something about failing to restart and needing to shift and restart. Usually I hear the engine restart, but I had the stereo pretty cranked, which I usually don’t.

So then, in a panic I shifted to park and tried restarting- all the startup/idiot lights were coming on and my gauges were going all the way up and back down, but the car wasn’t even cranking. At this point I had a chorus of horns behind me- put the flashers on. Tried two more times and it finally started and I just took off and drove home. I got no error messages and the damn stop/start system was still active as soon as I got the engine running again. And every time I had tried starting it, before it cranked, all these different messages from the top-center of the screen kept popping up.

I let it stop the engine a couple times when I got back to my driveway and it fired right up like usual.

Has anyone else experienced anything like this? I’m seeing some examples in the XC90 forum and it seems like it might be related to a bad battery, or of course, software. But the posts I’m seeing there are from a couple years ago and I would hope the software has been figured out across the fleet at this point. This car already has 2 unresolvable problems; it doesn’t need a 3rd.


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I had the most unpleasant experience to date happen last night in this car. I was on my way home with dinner and came to a busy 4 way stop near my house. The engine cut, like it always does, when I came to a stop and waited for my turn. My turn came, took my foot off the brake and hit the gas- nothing. Looked down and a message was coming from the top-center of the drivers screen saying something about failing to restart and needing to shift and restart. Usually I hear the engine restart, but I had the stereo pretty cranked, which I usually don’t.

So then, in a panic I shifted to park and tried restarting- all the startup/idiot lights were coming on and my gauges were going all the way up and back down, but the car wasn’t even cranking. At this point I had a chorus of horns behind me- put the flashers on. Tried two more times and it finally started and I just took off and drove home. I got no error messages and the damn stop/start system was still active as soon as I got the engine running again. And every time I had tried starting it, before it cranked, all these different messages from the top-center of the screen kept popping up.

I let it stop the engine a couple times when I got back to my driveway and it fired right up like usual.

Has anyone else experienced anything like this? I’m seeing some examples in the XC90 forum and it seems like it might be related to a bad battery, or of course, software. But the posts I’m seeing there are from a couple years ago and I would hope the software has been figured out across the fleet at this point. This car already has 2 unresolvable problems; it doesn’t need a 3rd.


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1. I always recommend filming these problems (break out the smart phone). And then when you take into service, you can show Volvo what happened.

2. Some of these gremlins are harder to replicate than others. I'd start by taking your vehicle in for service and seeing if any codes were thrown. They might start by replacing the start / stop battery or checking for an electrical issue. That'd be my guess.
 

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Discussion Starter · #3 · (Edited)
1. I always recommend filming these problems (break out the smart phone). And then when you take into service, you can show Volvo what happened.

2. Some of these gremlins are harder to replicate than others. I'd start by taking your vehicle in for service and seeing if any codes were thrown. They might start by replacing the start / stop battery or checking for an electrical issue. That'd be my guess.
For sure, next time I’ll be ready with my iPhone. It just really caught me by surprise and my only focus was on making the beeping behind me stop and getting out of traffic.

I guess I have no choice but to bring it in to the dealer this week. I was really hoping I could push any further repairs out to the 10k service, but I’m only at 2k now... they’ll cringe for sure when they see me pull in.


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Breaking out your iPhone when the honking starts behind you might not be prudent...

One day it will just stop working and they'll want an outrageou$ amount of money for a battery, which you can decline and just enjoy life with out the Volvo Beta Auto Start Stop (B/A/S/S).
 

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The Start/Stop isn't supposed to work if the battery State of Charge is below a certain level. That said, I have had customers who came in with similar concerns. I wasn't able to verify it. I would test drive it but Start/Stop wouldn't work. Then I checked the batteries and one or both failed. Replaced the failed batteries, reset the BMS, made sure software was up to date and test drove and everything functioned properly.
 

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The Start/Stop isn't supposed to work if the battery State of Charge is below a certain level. That said, I have had customers who came in with similar concerns. I wasn't able to verify it. I would test drive it but Start/Stop wouldn't work. Then I checked the batteries and one or both failed. Replaced the failed batteries, reset the BMS, made sure software was up to date and test drove and everything functioned properly.
Would you say that the auto-start/stop feature in cars is a bad idea? That it isn't good to keep turning the engine on and off many, many times a day in usual urban commuting traffic? That it'd be better to keep the auto-start/stop option turned off, so that the engine remains on when doing lots of stops and starts?
 

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The Start/Stop isn't supposed to work if the battery State of Charge is below a certain level. That said, I have had customers who came in with similar concerns. I wasn't able to verify it. I would test drive it but Start/Stop wouldn't work. Then I checked the batteries and one or both failed. Replaced the failed batteries, reset the BMS, made sure software was up to date and test drove and everything functioned properly.
Would you say that the auto-start/stop feature in cars is a bad idea? That it isn't good to keep turning the engine on and off many, many times a day in usual urban commuting traffic? That it'd be better to keep the auto-start/stop option turned off, so that the engine remains on when doing lots of stops and starts?
It's for emissions. The overall emissions benefits depend on the driver. My personal opinion is I don't care for the feature.
 

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It's for emissions. The overall emissions benefits depend on the driver. My personal opinion is I don't care for the feature.
Yeah, I know it's for emissions. That's not my question. My question is: from a tech point-of-view, is it a bad idea to keep auto-start/stop ON in lots of stop-and-go traffic, due to wear on engine parts, etc.? Forget about emissions for what I'm asking; I'm asking about the health of the car, not the health of the surrounding air.
 

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I wouldn't worry about the health of the car in general. If the engine is cold, it won't work. So they are warm starts. The only concern might be the starter, which they say can handle it. Whether it can handle it or not, less starts on a starter is less wear.
 

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Discussion Starter · #10 ·
The Start/Stop isn't supposed to work if the battery State of Charge is below a certain level. That said, I have had customers who came in with similar concerns. I wasn't able to verify it. I would test drive it but Start/Stop wouldn't work. Then I checked the batteries and one or both failed. Replaced the failed batteries, reset the BMS, made sure software was up to date and test drove and everything functioned properly.

Thanks for the info Tech- glad to hear it was easily resolved in the cases you saw. I’m pretty bothered that safeguards built into the software didn’t prevent the system from activating if it didn’t think it could restart the engine.

I just have it turned off for now.


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I never enabled the feature and never plan to.
 

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Discussion Starter · #12 ·
I was actually really getting into it until that happened. It took some getting used to, but it’s much smoother and faster in the ‘19s than the older models.

My around-town fuel mileage definitely benefited from having it on.


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Same Experience Yesterday 10/26

I had the most unpleasant experience to date happen last night in this car. I was on my way home with dinner and came to a busy 4 way stop near my house. The engine cut, like it always does, when I came to a stop and waited for my turn. My turn came, took my foot off the brake and hit the gas- nothing. Looked down and a message was coming from the top-center of the drivers screen saying something about failing to restart and needing to shift and restart. Usually I hear the engine restart, but I had the stereo pretty cranked, which I usually don’t.

So then, in a panic I shifted to park and tried restarting- all the startup/idiot lights were coming on and my gauges were going all the way up and back down, but the car wasn’t even cranking. At this point I had a chorus of horns behind me- put the flashers on. Tried two more times and it finally started and I just took off and drove home. I got no error messages and the damn stop/start system was still active as soon as I got the engine running again. And every time I had tried starting it, before it cranked, all these different messages from the top-center of the screen kept popping up.

I let it stop the engine a couple times when I got back to my driveway and it fired right up like usual.

Has anyone else experienced anything like this? I’m seeing some examples in the XC90 forum and it seems like it might be related to a bad battery, or of course, software. But the posts I’m seeing there are from a couple years ago and I would hope the software has been figured out across the fleet at this point. This car already has 2 unresolvable problems; it doesn’t need a 3rd.


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This exact thing happened to my partner yesterday morning in our 2018 XC60 and was frightening. She had come up to a two lane highway from a side street on a downhill, proceeded to remove her foot from the brake to turn onto the highway and nothing happened. The car rolled out into traffic since the sidestreet was a hill. Sitting in the middle of the road, she first tried shifting to reverse to back up with no luck. After trying that she put the car in park, shut it off, turned it back on and back in drive where the engine turned on. This whole thing happened in the middle of the road and we're really lucky there was no cross-traffic.

After talking about it, she mentioned that there was a message friday or saturday about a recent software update that had completed when she turned the car on. We're not 100% sure it was before or after the incident.

Either way we're both frightened by this and don't feel comfortable using the feature anymore. If there had been cross-traffic things could have ended up much worse...
 

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This happened to our '16 XC90. Sometimes it wouldn't start in the morning but it took a dozen or so tries to finally work. When you try to turn the car on, it was just a click or two and then nothing.

It was the starter that needed replacing which isn't great for a 3 year old vehicle.
 

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Would you say that the auto-start/stop feature in cars is a bad idea? That it isn't good to keep turning the engine on and off many, many times a day in usual urban commuting traffic? That it'd be better to keep the auto-start/stop option turned off, so that the engine remains on when doing lots of stops and starts?
I've had mixed feelings about this feature from the start when I took delivery of my 2017 V60. The only time I find it practical is when approaching traffic lights which have just turned red, knowing I will be stopped for most of the light cycle. When approaching stop signs, traffic circles, parking spaces, or when pulling into my garage, anywhere that you may do a good deal of slowing inching the vehicle forward, it needs to be turned off. I wish the off switch would have been located more conveniently (maybe on the wheel) so I wouldn't need to take my eye off the road for so long as I use it a LOT! From the time I got my car I have wondered why a car which can read speed limit signs and show them in the IP cannot identify traffic lights and activate this feature specifically for that situation.

Over on the 2011-2018 forum I posted my experiences this week with a failed starter fusible link on my car which occurred at 51,006 miles, just past the warranty, causing the car to die while in motion (a potentially dangerous situation). I had to have it towed to the dealer. After getting the car back (and paying the dealer $225) I did a little research and found that my car was supposed to be part of a recall I was never notified of. The recall solution was to increase the amp rating of the part. Volvo's records say that my car had had this repair done at the port yet the failed part that came off the car (I demanded it) was rated at 220 amps and the one they replaced it with is 250. Still waiting for Volvo customer service to respond before I file a complaint with NHTSA.

That problems with stop/start are still occurring on cars newer than mine suggests that this feature still is not fully baked. I wish I could opt to have the feature default to off when the car is started as my wife and I both use the car and I'd like for the starter to last a long time.
 

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I never enabled the feature and never plan to.
This is the first feature that I will make sure is off as soon as I get my car.
 

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Discussion Starter · #17 ·
This exact thing happened to my partner yesterday morning in our 2018 XC60 and was frightening. She had come up to a two lane highway from a side street on a downhill, proceeded to remove her foot from the brake to turn onto the highway and nothing happened. The car rolled out into traffic since the sidestreet was a hill. Sitting in the middle of the road, she first tried shifting to reverse to back up with no luck. After trying that she put the car in park, shut it off, turned it back on and back in drive where the engine turned on. This whole thing happened in the middle of the road and we're really lucky there was no cross-traffic.

After talking about it, she mentioned that there was a message friday or saturday about a recent software update that had completed when she turned the car on. We're not 100% sure it was before or after the incident.

Either way we're both frightened by this and don't feel comfortable using the feature anymore. If there had been cross-traffic things could have ended up much worse...
This easily could have been the case with me too- luckily the intersection was flat, but I live in a hilly area and there have been lots of times my car was already rolling while it was restarting.

This is one of those systems that shouldn’t go anywhere near a production car until it’s fully tested and validated. I read through the manual and it says that if you have the stereo turned way up, or there are any other large draws on the electrical system then it won’t activate the start stop system. Yet, it did exactly what it said it wouldn’t here.

And while the battery may have a fault or something, it has never seemed that the battery is low on charge. The car cranks quickly and fires up really quick. I’m surprised that it wouldn’t even try to start when this happened. There was no clicking or anything to suggest it was trying.


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And while the battery may have a fault or something, it has never seemed that the battery is low on charge. The car cranks quickly and fires up really quick. I’m surprised that it wouldn’t even try to start when this happened. There was no clicking or anything to suggest it was trying.
It's the secondary battery specifically for this system which fails, not the main start/stop battery (usually).
 

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Discussion Starter · #19 ·
It's the secondary battery specifically for this system which fails, not the main start/stop battery (usually).
But the secondary only supplies accessories with power while the engine is off, right? And the main battery is always responsible for cranking?


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But the secondary only supplies accessories with power while the engine is off, right? And the main battery is always responsible for cranking?


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Both battery are monitored by software and could be the reason not to enable start/stop when it doesn't meet required condition.

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