[david.givens.nc]

I searched through the community best I could to see if there was information related to this topic and didn't find anything. We were going to call the dealer but I thought I would throw this out here first for some feedback. We have a late model 22 XC60 ER T8 w/AAOS and when doing local driving we drive mostly in Pure mode with one pedal driving. A while back we ran across an issue while driving when we pulled back from the pedal and when the regen braking should immediately start to kick in, the car would remain at speed until you actually hit the brake. It's not like it was coasting, it remained at speed like the pedal was pushed. When this first happened, we rebooted the car and everything seemed fine. Over the last couple of weeks it started to occur again and actually happened twice today, requiring 2 reboots of the car.

I was wondering if anyone else has experienced this. As a side note we have been driving pretty trouble free for a while. We will be approaching the one year anniversary of buying the car with just under 12,000 miles. We are on the latest software version of 2.7 I believe.

Thanks for any comments or thoughts. Dave

 

[AvocadoFarm]

That's a little scary...Are you certain Pilot Assist was not engaged accidentally or otherwise?

 

[david.givens.nc]

We did check that and Pilot Assist was not engaged. In fact when this happened today it was right after starting the car in the garage at home. We backed out into the turnaround, put the car in B mode started down the driveway at a slow speed and went to pull off the accelerator to stop at the end of the driveway and the car just kept going until we hit the brake. Needless to say we'll stop using the one pedal driving option until we can get this checked. It also never happened prior to Version 2.7 so I'm not sure if that anything to do with it? Not saying it did but would not want to rule it out. Another comment, once we reboot the car it seems to drive without issues for a while but it comes back. So being a sporadic issue will probably be hard to diagnose. Honestly we thought we were doing something stupid but we've had the car now for a while and using the one pedal method just seems natural to us at this point.

 

[AvocadoFarm]

We did check that and Pilot Assist was not engaged. In fact when this happened today it was right after starting the car in the garage at home. We backed out into the turnaround, put the car in B mode started down the driveway at a slow speed and went to pull off the accelerator to stop at the end of the driveway and the car just kept going until we hit the brake. Needless to say we'll stop using the one pedal driving option until we can get this checked. It also never happened prior to Version 2.7 so I'm not sure if that anything to do with it? Not saying it did but would not want to rule it out. Another comment, once we reboot the car it seems to drive without issues for a while but it comes back. So being a sporadic issue will probably be hard to diagnose. Honestly we thought we were doing something stupid but we've had the car now for a while and using the one pedal method just seems natural to us at this point.

Interesting. Please post the resolution if when (if?) you find it.

 

[Walkabout]

First report I've seen of anything like this.

I think you'll have a problem with the dealer though. If they fail to replicate the problem, and do not find an error code, they will tell you that the vehicle is operating as it should.

 

[Pioneer4x4]

A reminder, car will not decel/regen brake in B with a full battery. Probably not what you experienced, but keep that in mind.

 

[david.givens.nc]

A reminder, car will not decel/regen brake in B with a full battery. Probably not what you experienced, but keep that in mind.

That could have been what happened today. I'll report back to everyone, if/when we find something out.

 

[Walkabout]

A reminder, car will not decel/regen brake in B with a full battery. Probably not what you experienced, but keep that in mind.

Never knew that. Thanks for the info!

 

[DFrantz]

A reminder, car will not decel/regen brake in B with a full battery. Probably not what you experienced, but keep that in mind.

I don't understand why they can't just program that into a buffer space for the battery.

 

[Walkabout]

I thought the buffer space was some kind of protective feature.

I don't this is what is happening for the op in any case. Go around the block in pure and you've already made battery room.

 

[Pioneer4x4]

I don't understand why they can't just program that into a buffer space for the battery.

If they did, that too could fill up, and full, is full, no regen with "full"
Now some other EVs (EV only) like maybe even the Polestar 2, will use friction brakes in B or whatever when regen isn't available, seamlessly to the driver.

 

[DFrantz]

If they did, that too could fill up, and full, is full, no regen with "full"
Now some other EVs (EV only) like maybe even the Polestar 2, will use friction brakes in B or whatever when regen isn't available, seamlessly to the driver.

I mean you'd have to have a fairly big hill to overcharge a 1% buffer. Or use the friction brakes as you said. Either way, it's a goofy decision. Lack of braking in reverse on PHEV is a poor programming choice as well.

 

[How'sVolvo]

Get it checked out because something is wrong. I've had my 2022 late xc60 recharge er for 10 months and charge it to full battery every day and that has never happened to me. Knock on wood.

 

[Pioneer4x4]

I mean you'd have to have a fairly big hill to overcharge a 1% buffer. Or use the friction brakes as you said. Either way, it's a goofy decision. Lack of braking in reverse on PHEV is a poor programming choice as well.

I've gained MILES on 1 descent alone. 1-2 easily, some long descents more like 3-4. That is like %15 of my capacity.
Just today, returning from medical visit, battery was empty. Put it in "hold" while in Pure Drive Mode, I gained 3 miles over about 7 miles of driving on my way home. And used those up in the last 2 miles to my house (uphill killed it), and parked a fully cooled down car in my garage.
Total stats for the day, over 6KWh regen over only 46 miles. So I got basically 150% of battery capacity used.

 

[DFrantz]

Well yeah if you're using hold... I mean for normal driving, you're going to use more than you make. But okay, if you live at the top of a hill you'd need a way to burn out those extra watts.

 

[Pioneer4x4]

Well yeah if you're using hold... I mean for normal driving, you're going to use more than you make. But okay, if you live at the top of a hill you'd need a way to burn out those extra watts.

Yep, it all comes down to WHEN you want to burn those electrons, ideally, at least 25%-35% of them ASAP so you can regen more efficiently/effectively, boosting your overall economy.

 

[rmj.scribbins]

I've gained MILES on 1 descent alone. 1-2 easily, some long descents more like 3-4. That is like %15 of my capacity.
Just today, returning from medical visit, battery was empty. Put it in "hold" while in Pure Drive Mode, I gained 3 miles over about 7 miles of driving on my way home. And used those up in the last 2 miles to my house (uphill killed it), and parked a fully cooled down car in my garage.
Total stats for the day, over 6KWh regen over only 46 miles. So I got basically 150% of battery capacity used.
View attachment 194166

I think my brain broke, how do you "hold" in Pure mode? Or more accurately, how does the car interpret holding in Pure mode?

 

[Pioneer4x4]

I think my brain broke, how do you "hold" in Pure mode? Or more accurately, how does the car interpret holding in Pure mode?

I press the wheel, touch "Pure" pretty much every time I start the car, then swipe to the right, and tap "Hold" once I use up say 1/3 of the EV when going longer than 40-50 miles.
Then I try to use up the remaining EV miles until what I have left will get me home (takes some practice, due to hilly area and most times it is uphill to get home), and I love getting home with "--" miles remaining, but still on EV backing into the garage!
But as for driving in Pure, on "Hold" it works basically like "Hybrid" does when battery is empty, but a smidge more of EV use when pulling out, and the reduced HVAC for efficiency.
Also remember I have the smallest battery of the T8s, and the "Pure" mode that you can still easily accidentally start the ICE if you aren't watching the throttle bar gauge, so it is like I'm playing a game of "can I beat the system" and get the most out of what it can do, every time I drive.
Recently with some medical crap I'm going through, my wife has had to drive home a couple times, and she just leaves it all as default, in Hybrid, never hits hold, just plain drives the car, and it still does very well with what it does by default, but I feel I can beat it at its own game almost every time.
And I still go Power Mode and play when I'm first at the light at times, or out in the open on back roads, and still get impressed by how little fuel I actually burn.
Never thought I'd have a larger car that is very roomy, and heavy, and can EASILY get over 30MPG 100% of the time, with 35-40MPG possible on long trips, and be able to run a 13.2" ¼ mile at over 104MPH.

 

[rmj.scribbins]

But as for driving in Pure, on "Hold" it works basically like "Hybrid" does when battery is empty, but a smidge more of EV use when pulling out...

Nice, thanks for the explanation...will have to give it a try. I usually run Pure home from work, but never realized I could take advantage of the hold setting.

100% agree on the milage you can get out of the T8, I had a '22 XC60 B6 and the average MPG was 19. My current T8 I'm getting 36, and like you I like to use Power/Polestar Mode at lights, haha. No one expects how fast this thing is.

 

[Pioneer4x4]

...I'm getting 36, and like you I like to use Power/Polestar Mode at lights, haha. No one expects how fast this thing is.

I'm pushing 60, and went from a 392 Challenger to this Volvo and it is dang near as quick off the line, maybe even quicker on normal pavement initially. They just repaved some of RT 30 near my house, and in Power mode, with Traction control off/sport mode/esc off/whatever, the fronts let out a VERY high pitched squeal on the brand new pavement, as the rear EV kept it moving and hooked up. I was pleased!