[Chrisso]

I only drive my i5 about twice a week. So far no 12v battery issues (touch wood).
I aways use the key fob to open and close the charging door. I have the charging set in the car. I hardly ever use the app as my wi-fi isn't good.

 

[henrik28]

Not sure if I have ever opened the flap with the app and I had the drain last week. BM2 installed now though...dare I test it?

Don't test it right now ... I am in deep problems testing this!
Went back to recheck, and put my amp-meter on the battery lead, and it showed a normal value of about 0.05 A.
And then;
1. Opened the charge door with the app -> Current increased to 9 A (!), and stayed there.
2. Did a refresh from the app -> No change, still pending current 6 - 9 A.
3. Closed the door both from the app and button -> No change.
4. Was desperate and disconnected the battery.
5. Waited a while and connected the battery -> Current stays at 6.0 A now, and no explanation why ...
6. Got my first ever "Low battery" red warning from the BM2 at about 12.0V, but the HV charger never kicked in.

Just connected the car to my charger. Let's see what happens ...
The problem seems to be more severe than I thought!

 

[henrik28]

The charging cable is plugged in (and obviously the charge door is open!)
Still the app is saying that the charge door is closed.
Can't remember if this icon has been showing the real state, so can somebody confirm, please.

I'm thinking that the CPU cannot read the state (hardware fault?), thus driving the door open/close continuously.
Have to find some explanation to the constant 6A current now draining my battery.
(I'm not going to check the fuses - that will be the dealers job ...)

Note: The app is still showing no info about the battery (no icon at all).
This has to be fixed by Hyundai, and there should be a message in the app if/when the battery is draining at >5A with the doors locked!!!

 

[MIkeS]

The charging cable is plugged in (and obviously the charge door is open!)
Still the app is saying that the charge door is closed.
Can't remember if this icon has been showing the real state, so can somebody confirm, please.

I'm thinking that the CPU cannot read the state (hardware faiult?), thus driving the door open/close continuously.
Have to find some explanation to the constant 6A current now draining my battery.
(I'm not going to check the fuses - that will be the dealers job ...)

Note: The app is still showing no info about the battery (no icon at all).
This has to be fixed by Hyundai, and there should be a message in the app if/when the battery is draining at >5A with the doors locked!!!

My app is still showing my charging door correctly closed. After I tested opening the charging door with the app I also saw the 12v battery being drained. I thought it had stopped after I closed it manually but checked later and it was still discharging. Car has just started an auto top up of the 12v so waiting to see what is happening now.

Have you driven you car to see it that resets it?

 

[SpamJavelin]

That test didn't take long. Used the app to open the flap at 12 then watched the drain take place until I got the low battery warning then immediately unlocked the car and turned it on. I'm not sure if this is the only scenario that causes drain but it's reproducible in different vehicles.

 

[MIkeS]

View attachment 37790
View attachment 37789

That test didn't take long. Used the app to open the flap at 12 then watched the drain take place until I got the low battery warning then immediately unlocked the car and turned it on. I'm not sure if this is the only scenario that causes drain but it's reproducible in different vehicles.

Check you car again as some are having problems getting it to stop the drain of the 12v after using the app to open the charging door.

 

[SpamJavelin]

Check you car again as some are having problems getting it to stop the drain of the 12v after using the app to open the charging door.

Thanks for the tip-off, battery was still getting hammered after turning off ignition and locking up. Hit refresh in Bluelink and it's back to charging again.

 

[Samo-k]

Thanks all. That is great news! The dealership had pretty much given up trying to reproduce it.

I think this is a fault highlighted by a usage issue. I don't imagine most people use the same charge process I do. My wife mainly uses the car and doesn't usually plug it in. I often plug it in when I come back from walking the dogs which means I have my phone (app) but not the car key so I'm much more likely to open it using the app.

My guess is, if you drive it off at the lowest point you can end up stopping with less than 12V. When you come back to the car it will not go in to drive. We've had this happen more than 5 times now.

So the 'work-around' is don't open the charge door with the app!

Tomorrow I'll be taking this up with the dealership as a software bug. My best guess (as a software developer) is it's sending the CPU in to a 'tight loop' (100% CPU) and that a status update clears it. This might also explain slow screen performance sometimes(?)

Ive had the same problem twice now. Both times charged overnight and last one definitely used the app. Car drive for a mile or so, same as last time on thr school run and then wouldn't start. Car still at dealership and they are not sure what's up with it so good to read this. Problem solved perhaps?

 

[Collers]

Ive had the same problem twice now. Both times charged overnight and last one definitely used the app. Car drive for a mile or so, same as last time on thr school run and then wouldn't start. Car still at dealership and they are not sure what's up with it so good to read this. Problem solved perhaps?

Thanks Samo-k. It's good to get confirmation that it's not just me/us. The car not starting has only ever happened to my wife and she was getting paranoid that she was doing something wrong. Really took the shine off having a new car. Really hoping this has been the problem all along.

 

[henrik28]

Have you driven you car to see it that resets it?

Thanks @MIkeS! It helped. Went for a 30 min drive and it settled to steady 12.65V.
But I will not use the app for a while now ...

There has really been a few things taking the shine off having a new car.
But this is what this forum is about - helping others.
Now let's hope Hyundai is helping us too!

 

[MIkeS]

Thanks for the tip-off, battery was still getting hammered after turning off ignition and locking up. Hit refresh in Bluelink and it's back to charging again.

View attachment 37792

How did you refresh the app? What screen is it on?

 

[MIkeS]

Thanks @MIkeS! It helped. Went for a 30 min drive and it settled to steady 12.65V.
But I will not use the app for a while now ...

There has really been a few things taking the shine off having a new car.
But this is what this forum is about - helping others.
Now let's hope Hyundai is helping us too!

Have you reported this issue to Hyundai? I have sent the following to Hyundai UK:

There have been a few reports in various forums about 12v battery failures. It now appears that one source of the problem has been identified. One owner that has a BM2 battery monitor captured the fault. It would appear that if you use the Bluelink app to open the charge port door then the 12v battery gets drained very quickly. One owner measured a 9 amp load. ON the link below you can see the 12v battery's voltage dropping and the HV battery trying to top it up. Furthermore, it seems that this fault does not reset until either the app is refreshed or in some cases until the car is driven for a while.

It would seem there is a defect in the way the app is controlling the car for this function and if unnoticed it drains the 12v battery. It would seem that owners should be told as a matter of urgency to not use the app for this function until the fault can be fully identified and fixed. Personally, I will not use the app at all until a fix is published.

Full details can see found here - Don't use the app to open your charge door! (was...

 

[Collers]

Have you reported this issue to Hyundai?!

I have an issue open with them and have sent them an update on this. Not sure if it’s going to the right people though :-/

 

[toscal353]

Excellent work @Collers and others, well done!

This sounds like a problem for HUK to sort out rather than leaving it to your dealer. From the details above it does sound like an app issue, but could still be the car software or the charge port itself. I agree though - don't use the app!

 

[henrik28]

Have you reported this issue to Hyundai?

I will report, but right now I started to think if this issue by any chance is already fixed in the BMS/driveline software update ...
I haven't yet updated the Battery Management System (only MCU and LKA updates are done).
Still wondering why my HV charger did not top up my 12V battery draining quickly to 12.0V, so just to be sure;
Can we confirm that this issue also exists in cars with updated BMS ??

 

[Doctor_of_Music]

Don't test it right now ... I am in deep problems testing this!
Went back to recheck, and put my amp-meter on the battery lead, and it showed a normal value of about 0.05 A.
And then;
1. Opened the charge door with the app -> Current increased to 9 A (!), and stayed there.
2. Did a refresh from the app -> No change, still pending current 6 - 9 A.
3. Closed the door both from the app and button -> No change.
4. Was desperate and disconnected the battery.
5. Waited a while and connected the battery -> Current stays at 6.0 A now, and no explanation why ...
6. Got my first ever "Low battery" red warning from the BM2 at about 12.0V, but the HV charger never kicked in.

Just connected the car to my charger. Let's see what happens ...
The problem seems to be more severe than I thought!

I don't like the idea of an inexplicable battery drain of up to 9A. At around 80+ watts, something, somewhere in the car must be getting awfully warm....
Fortunately I've only ever opened the charging flap using the key fob, and I'm now extremely grateful that I did.

 

[Collers]

I haven't yet updated the Battery Management System (only MCU and LKA updates are done).
Still wondering why my HV charger did not top up my 12V battery draining quickly to 12.0V, so just to be sure;
Can we confirm that this issue also exists in cars with updated BMS ??

Yes. My car has all three. My understanding was the BMS update was to fix an issue with not starting after a fast charge. There was a hope (by the dealership) that it would fix the non-starting issues I was seeing too.

 

[RayRay]

I had a similar drain on my car. The car was closed, locked and with no charge port open. No app was used other than checking the car status. About 2000 24th December my 12v battery was at 83% charged. At 1000 next morning my battery was depleted down to 4,9V. 12V battery is surely sulfates.

 

[dorf]

Well done Collers for capturing the problem on the BM2 and Henrik28 for actually measuring the level of drain, I tested opening the port with the app. and had exactly the same problem and like Henrik was unable to clear the problem by refreshing the app. status.
Now we now know that the fault can take the 12v battery down from typically 12.5v to 12.15v within 20 mins or so. That represents 20% of the total battery charge so just normal use of lights heaters etc could soon put the car into Vampire ( car doesn't go) mode.
I found that the easiest way to clear the problem is to put the climate control on for 10 mins.The BM2 graph (12noon to 2pm) confirms that using the App to open the port drains the battery.
Switching the car to READY mode (14:30 to 15:15) does not clear the problem.
Putting the car on charge clears it (15:45 to 16:20). but you might not be near a charge point.

The App.port button pressed again, restarted the drain (17:00)

Climate control started (17:30) cleared the drain problem back to normal.

Hopefully a software fix will be forthcoming.

 

[Restyler]

Well done Collers for capturing the problem on the BM2 and Henrik28 for actually measuring the level of drain,...

View attachment 37812

Minor point, but the I5 battery is a regular lead acid type CMF60L & not an AGM type as referred to in your pic above