MG4 randomly stops charging

[tsedge]

Is this issue with the newer (rear wiper) as well or just the first batch?

CCU problems seem mainly confined to LR first batch (Phase 1) cars without the rear wiper.

 

[Rolfe]

@atariman has an SR, and we've never seen the CCU issue with the SR.

 

[atariman]

If you have an MG granny charger what do the lights show? (Mapping on base of the charger.)

I'll check next time it happens and will post findings.

 

[tsedge]

@atariman has an SR, and we've never seen the CCU issue with the SR.

Yes I am aware of that. CCU failure is possible on any EV. Although predominantly we've seen it on Phase 1 LR - that doesn't mean it won't ever happen on a SR.

 

[Rolfe]

Anything's possible, but the sheer number of phase 1 LRs that have had the problem - the ones with the 3-phase AC charging I think - suggests there's something very specific about these cars. Not a single SR affected yet.

 

[tsedge]

Anything's possible, but the sheer number of phase 1 LRs that have had the problem - the ones with the 3-phase AC charging I think - suggests there's something very specific about these cars. Not a single SR affected yet.

Yes, that is exactly what I originally said.

 

[Rolfe]

We agree, then!

 

[Tight Git]

I do hope that the replacement 3 phase CCUs that are being fitted are more reliable than the original ones...

I wonder if this is only a UK issue or if it is happening in other markets - anyone know?

 

[Rolfe]

It's not been happening in markets that didn't get the phase 1 cars.

 

[Kees]

I do hope that the replacement 3 phase CCUs that are being fitted are more reliable than the original ones...

I wonder if this is only a UK issue or if it is happening in other markets - anyone know?

It happens in the Netherlands too. I'm happy with the 7 year guarantee. And hope that I don't need to get the CCU replaced every year.

 

[Ian Key]

I wonder if the CCU software update prevents this problem happening if it is applied before the CCU starts to be defective?

 

[tsedge]

I wonder if the CCU software update prevents this problem happening if it is applied before the CCU starts to be defective?

It is possible, although it clearly points to component failure of some sort and they will no doubt have had lots of different revisions of the CCU, parts like this get upgraded regularly in the supply chain.

 

[domwild]

I've had an MG4 SE long range for a few months now (was a dealer demonstrator).

Everything has been fine but I'm now getting an issue where the car stops charging randomly on it's own.

This happens when I’m charging overnight on a schedule - usually after a couple of hours. But it also happens if I do a manual charge - sometimes after an hour, sometimes after just a couple of minutes. Happens at all levels of charge.

There’s no schedule or charging limit set in the car.

The BG SyncEV charger is being controlled via the Monta app - and the log says “SuspendedEV” which suggests it’s the car pausing the charge. I say pausing, but it never restarts itself when it stops like this.

It makes no difference if I've set the charge to stop at 80% or not, and it always stops at different levels of charge.

Anyone else had an issue like this?

The MG iSmart app (Australia) software has the same problem of stopping the scheduled transfer at any time. Just changing the start and end times does not even reflect on the screen. Another forum suggested setting it in the car via "Energy Management" and that will fix it.

 

[lizziejeanskipper]

Our MG4 SE LR has recently started switching off battery charging by itself - usually after a few minutes. We only use a granny charger at home. It has always been difficult to get charging started useing the phone app. Last night it refused to charge on schedule for the first time. Any advice on what to tell the dealer please?

 

[siteguru]

How old is your car? Does it have a rear wiper?

 

[lizziejeanskipper]

Our MG4 was purchased in April 2023. It does not have a rear wiper.

 

[siteguru]

OK ... if you look at the charge port on the car, can you see metal pins in the L2 and L3 slots? If yes then you may have the dreaded CCU Failure issue that early Long Range cars with 3-phase CCUs have suffered.

Issue with AC charging/New CCU fitted (Phase One SE LR) | MG4 EV (2022 to 2025) Forum

Edit: Originally, I thought I had an issue with my Zappi not being able to charge the car, but after testing other AC charging points (cutting out after fifteen minutes or less) and contacting the dealer, I eventually found out it was an issue with the car, namely the charge control unit, which...

www.mgevs.com

 

[lizziejeanskipper]

No, the metal pins are only in PP and PE slots. Is this good?

 

[siteguru]

It means you don't have a 3-phase CCU so the issue in the linked thread shouldn't be relevant. Beyond that you probably need to talk with your dealer.

 

[Martinonline]

@lizziejeanskipper, note that the lower pins are plastic covered at the top you have to look further down. Follow @siteguru's link above and look at the socket photo on the first page. Is yours the same?