[MSD]

This morning, while plugged in overnight, the car charged to 100% charge state. I did not consciously set the requested charge state to 100%, as I always keep it at 80%. That's the first time in 4 months that I observed that. Both the delayed % and 'charge now' % are normally at 80%.

A pal with Blazer EV has had this happen a couple times too, maybe once a month for him. (and in fact, he reports that his Blazer did this last night also)

This was not a case where I requested 80% and it went to 83%, i.e., some small variation from the requested number. The car clearly wanted to go to 100%.

Reasons I could think of that could cause this:

A) I somehow set it to 100%. I really don't think I did that. However, upon looking after it reached 100%, I see it is set to 100%. Unless there is a record of the requested states, I can't prove/disprove this.

B) I used a public charger yesterday, and went to near to 80% using that charger. That Shell L2 charger was much stronger (11.5 kw) than my weak 20 Amp L2 (4.8 kw) I have at home. So maybe the car's math estimates on how to reach 80% is based on the last charge rate, and errantly charged longer based on those recent rates of charge.

C) Maybe the car had some reboot/reset event, to trigger a 'fall back' to defaults. I don't know really that the default is 100%.

Has anyone else experienced this, or have insight into it? It's not a huge issue, but I don't want 100% charging as a normal state, naturally.

UPDATE: it wasn't A B or C. It was a power app "Optiwatt" that did that. It cant seem to master the 80% vs 100% setting on the Equinox EV specifically.

Last week I charged to 65% at a public DC charger. When I got home there was a software update which I OK'd. When it was done the car was at 75% (unplugged on the street). I thought it was a glitch on the 75%, but after driving it several times this week it's at 64%. Is 75% the new 65%? When plugged into Level 1 at 8amps, it charges less than 1%/hr. Set to charge to 80%, my car has at times stopped at 83%--charging for more than three hours being the target. There just lousy software on this car.

 

[MSD]

My wifes car has charged to 100% twice while set for 80%.
It also displayed 0% one day, until started even when it displayed several error codes which mysteriously disappeared when it "started".

This happened to me--0% SOC displayed, service high voltage--at the airport when I returned from a 3-day trip and it was about 15F. The car ran, the 3-day discharge was reasonable, and the alert disappeared eventually. I figured it was due to a battery sitting in the cold, but likely that combined with software logic errors interpreting the battery state.

 

[Illini]

Last week I charged to 65% at a public DC charger. When I got home there was a software update which I OK'd. When it was done the car was at 75% (unplugged on the street). I thought it was a glitch on the 75%, but after driving it several times this week it's at 64%. Is 75% the new 65%? When plugged into Level 1 at 8amps, it charges less than 1%/hr. Set to charge to 80%, my car has at times stopped at 83%--charging for more than three hours being the target. There just lousy software on this car.

This is more likely about how electric cars work, similar to Nissan and Tesla in this regard.

As temperatures warm, the battery capacity increases, so estimates of the next/current charge % are based on past data, but that past data was at different(probably colder temps).

That warmer outside temperature is why my car now said 337 miles of range (vs standard 319), and that 337 was pretty accurate too I feel.

 

[TheEVLife88]

Not quite the same but on Monday my car charged to 90% when it was set to 80 previously. I looked at it and the target was set to 90.

Tuesday I plugged it in and was about to set target to 80 and saw that it was set to 80 by itself.

Both was at home with location set.

 

[Ric982]

2025 Equnox EV, Last Firmware Update: GM 652.30. 48A Charger/240V.
Was away for two weeks with car on charger. Set to charge to 80% charge level.
On 9/24/25, returned to find it charged to 100%.
First occurrence. Have not plugged in again yet to see if it reoccurs.

 

[Fred_Savage]

2025 Equnox EV, Last Firmware Update: GM 652.30. 48A Charger/240V.
Was away for two weeks with car on charger. Set to charge to 80% charge level.
On 9/24/25, returned to find it charged to 100%.
First occurrence. Have not plugged in again yet to see if it reoccurs.

You should drive around a bit with some HVAC on to bring that 100% down closer to 80%, you know, for battery longevity sake.

 

[Illini]

You should drive around a bit with some HVAC on to bring that 100% down closer to 80%, you know, for battery longevity sake.

Or just turn it on with the heat on and windows open for an hour, or in camp mode...

 

[Steverino]

I would not freak out about the 100%. It's not ideal but the car won't blow up. Just drive it as usual. The SOC% will drop. Now, keeping it at 100% every day, day after day is not a good strategy