Parasitic drain on 12V battery

[Lovemyev]

UPDATE - MG have authorised the CCU to be changed and I might have the car back before Christmas.

This good news at last !.
I am just very curious on how they suddenly decided it was the CCU was the reason for the parasitic drain after all of this time, or is this just a stab in the dark without any clear evidence of diagnosis.
Had they proven the drain via an amp clamp, then when they replace the CCU and carry out the test again, then this would 100% prove that they have cured the problem.
If they have no means of testing for the drain, then firing the parts cannon at the car without locating the actual cause of the drain, is a best guess method unfortunately .
Unless they subsided the CCU from another car and the parasitic drain has suddenly stopped of course !.
This would be my guess here.

 

[Big L]

I have no idea unless MG thinks change the Brain and stop the drain, someone else has had the same issues as me but it was the TBox at fault, they are now onto their second one. As my SOS button wasn't working, I was thinking it could be this, I've had enough and even asked Stonacre how much would they buy the car back off me. If they don't come back with a reasonable figure then I guess they don't want it back.

 

[LenEV2016]

Fingers crossed

 

[Shwd mae]

Did you have any problems with the app? The app would often log me out and say 'account change, your account is logged in on another device'. The garage said that this may be connected to the problem.

 

[Big L]

Yes, I had the same problems with the app, in the end I uninstalled from my phone. I also had to press the screen 2 or 3 times before the radio worked.
Did you have issues with the SOS button as mine wouldn't work, then out of the blue it started ringing out then cut off after 3 rings. This was the only time I seen a red light next to the button.

 

[Ian Key]

UPDATE - MG have authorised the CCU to be changed and I might have the car back before Christmas.

MG are very thorough in trying to find the problem and don't like authorising the replacement of parts to "see if that works." My MG4 had the AC charging problem and everyone thought it was the CCU that was at fault, even the service staff were convinced that was the problem as that had been the fix with other cars with the same defect.

The CCU was exchanged with one from another car and it didn't work. Eventually they found that the ICS (Integrated Charging Socket) needed replacing.

What I'm trying to say is if MG has approved the replacement of the CCU then it will be the CCU that's defective. On My MG4 it took a week to get the part and one day to fit it so fingers crossed that yoy get it back for Christmas.

 

[Big L]

I hope you are right Ian

 

[Joningy]

It would be worthwhile if you fitted a Bluetooth battery monitor.

I'm now wondering if this may have caused my initial battery drain, but now I've removed it, I don't think it's cured the problem @Alb I'm ()

Hi sorry for your issues, I haven't got my car yet but have ordered a wireless battery monitor so I can see the battery condition and hopefully get a bit of early warning if an issue shows. My neighbour had to call the AA as one day he couldn't unlock his car as the 12V battery had drained .

This demonstrates the importance of a separate 12V Car Battery Booster, Portable Power Bank & combined Jump Leads, although we should NOT be needing to do, or buy anything to a brand new car.

 

[Big L]

Hi Guys, new update, the CCU that's on order has an ETA of 18th Feb, that's if it doesn't get knocked back.
That would mean Stoneacre have had the car 5 ½ months and there's no guarantee it will fix the issue. Also I have asked twice now if the other 2 issues have been fixed, the SOS button and boot issues, still waiting for word back.
On top of my 3 issues above, Stoneacre found 2 more faults, the seat belt and the lights, which they have fixed .
Also had a reply from Head office saying they are not going to refund/exchange car, as the master mechanic could not find any faults .
The whole thing is a fiasco and they don't have a time limit to fix the car. So hopefully I'll get my car back by 2017
Just to reiterate Stoneacre have done all they can, it's MG that needs to take a close look at themselves.
100% will never buy another MG after this, and mine will be sold as soon as I get it back.
Oh and Happy New Year everyone

 

[Shwd mae]

I feel your pain Big L. I had similar problems as you know, with the T block causing the problems. Everything now seems to be fine. I have posted in another post (MGS5 12v battery dead) that I think that my 'EV app' may have caused problems.

 

[Big L]

I have problems with the MG app as well, I log in then within 5 mins it says I'm logged in on another device (I'm not) then kicks me out and I have to log in again.

 

[Shwd mae]

Exactly the same. I removed the car from the EV app, and then 're-added' the car without linking it to the MG I smart app. Now I don't have to constantly log back into the MG app, and the car charger works fine, similar to how I used to charge my old MG5 EV.

 

[Joningy]

MG are very thorough in trying to find the problem and don't like authorising the replacement of parts to "see if that works." My MG4 had the AC charging problem and everyone thought it was the CCU that was at fault, even the service staff were convinced that was the problem as that had been the fix with other cars with the same defect.

The CCU was exchanged with one from another car and it didn't work. Eventually they found that the ICS (Integrated Charging Socket) needed replacing.

What I'm trying to say is if MG has approved the replacement of the CCU then it will be the CCU that's defective. On My MG4 it took a week to get the part and one day to fit it so fingers crossed that yoy get it back for Christmas.

Ian, was your ICS problem only a charging problem? did the 12V battery ever loose power and drain? I'm asking as I'm tying to eliminate potential red herrings on my sudden battery failure after running apparently well for 2.5 months.
Thanks for your help and input @Ian Key

 

[Shwd mae]

Just seen your post Joningy.
Out of interest, have you had problems with the mg ismart app logging you out?
Do you have the EV app?

 

[Joningy]

Just seen your post Joningy.
Out of interest, have you had problems with the mg ismart app logging you out?
Do you have the EV app?

Yes I use the MG i-smart app @Shwd mae , but never had a problem with it logging out and needing to re install it or anything, I don't think its overly slick mind you.

 

[Ian Key]

Ian, was your ICS problem only a charging problem? did the 12v battery ever loose power and drain? I'm asking as I'm tying to eliminate potential red herrings on my sudden battery failure after running apparently well for 2.5 months.
Thanks for your help and input @Ian Key

Yes it was. I never had a problem with the 12V battery although I did replace it after 2 years as a precaution.

 

[Joningy]

Yes it was. I never had a problem with the 12V battery although I did replace it after 2 years as a precaution.

Thanks Ian,, as I thought, it all helps @Ian Key