MG5 Dcdc charge fault??

[trehans]

Hi, bought my 21 MG5 prefacelift a few weeks ago, 15000 miles. Everything was going smoothly but today got a scare while driving when a warning message appeared - DCDC charge fault with a red battery symbol.
Car was at 78% charge and this warning appeared a few times before arriving home.
Anyone had any experience with this?
Help would be greatly appreciated.
Thanks

 

[maskull]

Not had that . If it's a few weeks old return to the dealer is best .

 

[Jomarkh]

What was the 12v battery level showing?

 

[Alb]

Not a common fault.
The logs will need to be interrogated by a dealer to get more info.

 

[MickeySw]

The only DCDC action happening while driving is the charging of the 12V aux from the HV battery via the CCU. That’s why looking at the 12V aux level as suggested by Jomarkh is important.

[Edit] above is actually not the full story, a working DC-DC will provide all low voltage power (including charging the 12V aux) to the car..

When the car is in Ready it should show a stable value around 14V, if it’s way below that or fluctuating the issue is more likely a faulty DC/DC. Suspect the 12V battery, if the car fails to go ready (these are known to fail and come with just 1 year warranty anyway)

Keep an eye on it otherwise and if it happens again bring it back to the dealer.

 

[trehans]

What was the 12v battery level showing?

Where do I find this?
Display shows 14.1V sometimes drops to 13.7 if that helps

The only DCDC action happening while driving is the charging of the 12V aux from the HV battery via the CCU. That’s why looking at the 12V aux level as suggested by Jomarkh is important.

When the car is in Ready it should show a stable value around 14V, if it’s way below that or fluctuating get a new battery (these are known to fail and come with just 1 year warranty anyway)

Keep an eye on it otherwise and if it happens again bring it back to the dealer.

The only DCDC action happening while driving is the charging of the 12V aux from the HV battery via the CCU. That’s why looking at the 12V aux level as suggested by Jomarkh is important.

When the car is in Ready it should show a stable value around 14V, if it’s way below that or fluctuating get a new battery (these are known to fail and come with just 1 year warranty anyway)

Keep an eye on it otherwise and if it happens again bring it back to the dealer.

What battery is recommended?

 

[maskull]

Where do I find this?
Display shows 14.1v sometimes drops to 13.7 if that helps

14 volt ,13.7 when lighting in use looks OK . Maybe it was a false warning. I would still take it to the dealer to have it checked and logged .

 

[RichP]

I’ve had similar but in addition to the dcdc charge fault, I also got auto hold fault and most recently motor fault. The car also either shuts down or goes into limp home mode. This first happened on the 3 June and 4 breakdowns and 6 months later the fault remains undiagnosed and I’m left without a car! I hope you have better luck.

 

[Richierich37]

Hi, bought my 21 MG5 prefacelift a few weeks ago, 15000 miles. Everything was going smoothly but today got a scare while driving when a warning message appeared - DCDC charge fault with a red battery symbol.
Car was at 78% charge and this warning appeared a few times before arriving home.
Anyone had any experience with this?
Help would be greatly appreciated.
Thanks

Hey, did you ever get the DCDC CHARGE FAULT fixed?

 

[decrep]

There's a very similar thread here. the fix was dealer replaced car. Maybe not that uncommon.

 

[Richierich37]

There's a very similar thread here. the fix was dealer replaced car. Maybe not that uncommon.

Cheers, I’ve had a look and my car is getting lifted tomorrow and delivered to the EV garage for diagnostics and hopefully fixing!