Car ignores charge limit

[Deleted member 13624]

Ok, I have tried rebooting the infotainment and adjusting the limit directly in the car.

It (80% limit) was ignored again last night. Car charged up fully in the charge window - this time that was from 47% to 89% (I only have a 4 hour schedule so it didn't have time to get to 100%).

Any other ideas before I contact the dealer again?

Have you tried setting the charge limit with the charge schedule on and off (the schedule on the car) to see if this changes anything for you?

 

[rogerl]

I have the same issue with my Trophy LR since they updated the BCM back in November. It's actually in the shop again now for an issue where the charge cable won't unplug sometimes and they've noted that the limiter's not working. I've been told that they've done a full SW update now, so it's possible that they need to now wait for MG do provide a new update.

 

[unbornidentity]

Yes I know that! I left myself open to that really though...

What I meant was they'd hardly leave me with a charge socket with all the pins and then switch in a single phase CCU - assuming I had been switched over to a SR setup I would get the whole bundle including port.

Now yes, whether it is 3-phase or single phase makes no difference to whether it stops at a charge limit, that's down the battery chemistry so is almost certainly just software which can be updated.

Well I suppose if they did put the wrong CCU in with the correct charge port it wouldn’t charge at 11kW. You could try charging on a 3 phase charger and see what happens! Worst case it would fry something and you’d get a fast diagnosis!!

 

[fnegroni]

do you plug in the charger when the car is switched on? Or do you plug it in after you have already locked the car or switched it off?

 

[tsedge]

Have you tried setting the charge limit with the charge schedule on and off (the schedule on the car) to see if this changes anything for you?

I am not using the car schedule, the schedule is set up on my Zappi.

 

[tsedge]

I have the same issue with my Trophy LR since they updated the BCM back in November. It's actually in the shop again now for an issue where the charge cable won't unplug sometimes and they've noted that the limiter's not working. I've been told that they've done a full SW update now, so it's possible that they need to now wait for MG do provide a new update.

Thanks. I will go back to them and see what they say. I have had a lot of updates so I might have the latest or might not.

 

[tsedge]

do you plug in the charger when the car is switched on? Or do you plug it in after you have already locked the car or switched it off?

I do what I have always done - jump out of the car, plug it in and then lock the car to switch it off. With a deferred charge schedule on my Zappi so it actually charges hours later overnight.

 

[tsedge]

Well I suppose if they did put the wrong CCU in with the correct charge port it wouldn’t charge at 11kW. You could try charging on a 3 phase charger and see what happens! Worst case it would fry something and you’d get a fast diagnosis!!

That is true, I will see if I can find one near me to test on.

 

[fnegroni]

I do what I have always done - jump out of the car, plug it in and then lock the car to switch it off. With a deferred charge schedule on my Zappi so it actually charges hours later overnight.

And the limit is only set through the app and matches what you see in the car?
Or if you set it in both, it’s set to the same percentage?
Maybe the hardware was replaced but the software/firmware needs upgrading too

 

[fnegroni]

I am not using the car schedule, the schedule is set up on my Zappi.

My bad I didn’t read this.
So you have a schedule on the zappi. No schedule on the car. But you have a limit % on the car.
Is it possible that the zappi is charging to the % limit, car disconnects from charger, and then the zappi starts charging again? Is there some sort of mode on the Zappi that charges outside of the schedule time based on other factors?

 

[tsedge]

And the limit is only set through the app and matches what you see in the car?
Or if you set it in both, it’s set to the same percentage?
Maybe the hardware was replaced but the software/firmware needs upgrading too

I have tried via the app - it is reflected in the car UI. I have tried via the car - it is reflected in the app UI. I have tried setting different limits, it is always ignored.

Fairly sure this is software, the car just needs to end the charge at the right point.

 

[tsedge]

My bad I didn’t read this.
So you have a schedule on the zappi. No schedule on the car. But you have a limit % on the car.
Is it possible that the zappi is charging to the % limit, car disconnects from charger, and then the zappi starts charging again? Is there some sort of mode on the Zappi that charges outside of the schedule time based on other factors?

I don't think so - this always worked in the past and I haven't touched the Zappi nor done an update on it. It has always worked as expected.

The Zappi shows a continual charge without a break in the logs.

Thank you for all your suggestions.

 

[Deleted member 13624]

I was once told. If you have a charger that is not fully integrated it just acts like a charger so vehicle settings will apply. If you have a charger which talks to the vehicle API then the charger will likely disregard all the settings around charging.

MY OHME is not integrated with the vehicle API it only "charges" so my vehicle settings don't get ignored, although I have tested and onboard vehicle charge schedule must be off in order for it to listen to the charge % limit set on the vehicle, otherwise it ignores and continues to 100%.

 

[MarkyDMan]

@tsedge - did you ever find the fix for this please? My Trophy LR was updated a couple of weeks ago and it's doing the same thing (ignoring the limit)

Thanks.

 

[rogerl]

@tsedge - did you ever find the fix for this please? My Trophy LR was updated a couple of weeks ago and it's doing the same thing (ignoring the limit)

Thanks.

What updates did they do? I had some updates back in December which introduced a bunch of issues, including the charge limit being ignored. I had some more updates in March that resolved it. This is the report from the garage,

1. Charging capacity set to 70%/80%/90% goes over this and charges to 100% - confirmed customer complaint , checked TRIP for similar concerns and found relevant bulletin – Carried out Software update to BCM/EVCC/CCU/BMS and IMCU – tested after software updates and charge capacity limit now stops at preset percentage.
2. Steering Wheel favourite buttons do not operate how they did before previous software updates – Confirmed fault with buttons , checked for available software versions , found later version of software available for FICM – Carried out latest software update to FCIM unit ( R46 Version ) – tested favourite buttons all working normally now.
3. Bluetooth Connectivity update included in the above FCIM update.

The first seem to be fixed, but the Bluetooth is still a bit temperamental.

 

[MarkyDMan]

What updates did they do? I had some updates back in December which introduced a bunch of issues, including the charge limit being ignored. I had some more updates in March that resolved it. This is the report from the garage,

1. Charging capacity set to 70%/80%/90% goes over this and charges to 100% - confirmed customer complaint , checked TRIP for similar concerns and found relevant bulletin – Carried out Software update to BCM/EVCC/CCU/BMS and IMCU – tested after software updates and charge capacity limit now stops at preset percentage.
2. Steering Wheel favourite buttons do not operate how they did before previous software updates – Confirmed fault with buttons , checked for available software versions , found later version of software available for FICM – Carried out latest software update to FCIM unit ( R46 Version ) – tested favourite buttons all working normally now.
3. Bluetooth Connectivity update included in the above FCIM update.

The first seem to be fixed, but the bluetooth is still a bit temperamental.

I don't know the complete list but I know they updated the BMS and MCU modules. I'll go back and ask about the fix you reference.

Interestingly, with regard to the steering wheel bottoms, I noticed that my right star no longer allows me to choose the option of selecting the source for the media player i.e. radio, online music, USB music, etc. It used to cycle through but now that option is no longer available to me, the other options are though. As part of the update, I got a software version R59 on the infotainment system and I suspect that is also a part of where some of the steering wheel button issues might have come from. I also have the new air conditioning icons that come with the new infotainment software. And I notice that the screen showing them now comes on when I press the button to turn on the air conditioning. But it never clears again and I have to clear it manually.

 

[Yorkiebarkid]

Drum roll, but I think I have the fix for this. I had the same problem, a Trophy that used to charge perfectly and then started to ignore the charge setting. It's the 'use GPS time' option in settings. When this is toggled on, the charge target is ignored. When it's off, back to perfect charging. Please let me know if this works for you.

 

[MarkyDMan]

Just tried that and im afraid it doesn't work. I set the limit to 70% and I even checked. It was set correctly in the car and in the app. I put the car on charge at 69%. And it has ignored the limit and is now at 72%

Thanks for suggesting the idea, but no joy for me.

 

[tsedge]

Yes, as said above, I had to take the car back to the dealer for further updates to fix the car ignoring the set charge limit.

These further updates (some of which may have been patches - I never got the details) finally fixed the issue and got it obeying the charge limit again (we did have to remove a charge schedule on the car as well which appeared for some reason).

The star buttons issue isn't the infotainment version per se, it is some kind of interaction between that and some other car modules. I am on R46.

Mine doesn't suffer from that issue, but then I also had a ton of updates done to update ACC, AEB, LKA, eCall and other areas due to problems I reported at my first service which crossed over with the charging issues investigation.

Unfortunately they never gave me any specifics of which modules they updates.

 

[rogerl]

The star buttons issue isn't the infotainment version per se, it is some kind of interaction between that and some other car modules. I am on R46.

Unfortunately they never gave me any specifics of which modules they updates.

Exactly what I found. On the original update, it broke the star buttons and then when they updated the infotainment system later, it fixed them, so it's definitely interaction between the different modules.

I was threatening to reject the car which got the personal attention of the service manager and a detailed report of what they updated.