DC Fast Charging Not Working, Only Type 2 AC Charging

[Sebastian]

Hi everyone,

I own a 2023 MG4 Luxury (manufactured in December, 64 kWh battery, ~19,750 km) and I’m currently facing a serious issue:
DC fast charging no longer works — only AC charging via Type 2 (around 10 kW) functions correctly.

I’ve tested the car at multiple DC fast chargers from different providers, but none of them initiate charging.
No error appears on the charger or on the car — it just doesn’t connect.

A yellow warning icon (battery with a slash through it) appears on the dashboard.
Ever since this symbol showed up, DC charging has been completely blocked.

I scanned the car using Car Scanner, and here is the list of DTCs I found:

• P1FED(92) – High Voltage Battery System Fault (active)
• P1A12 – HV Battery Cooling System Fault (passive)
• U1900 – CAN Communication Fault
• U0401 – Invalid data received from ECM/PCM
• U0422 – Invalid data received from BCM
• U0131 – Lost communication with Power Steering Control Module
• U0151 – Lost communication with Restraints Control Module (RCM)
• U3000 – General Control Module Fault

Has anyone experienced something similar — especially this yellow icon combined with complete DC charging failure?
Any help or advice would be greatly appreciated!


Thanks in advance!

 

[Wudus]

When I had this fault of DC charging not working it was fixed by a software update at a dealers

 

[Martinonline]

Do you know what voltage your 12v battery has? I note that the driver's screen is showing a problem with that charging circuit.

With your car in a safe position, you could try disconnecting the 12v negative terminal for 10 minutes and then reconnect. That may reset all the modules. There is a set up procedure afterwards see the Wiki and the top of the forum.

 

[Ian Key]

As @Wudus said, your software needs updating at your dealers. Mine is under investigation at the moment because it won't charge on DC. One of the first things they did was to update several software modules relating to charging.

 

[Sebastian]

I updated to R59 and it still didn't work, but I went to the MG representative and they opened a file with the errors for me, which they sent to MG China. I'm waiting for them to call me to see what they decide.
Upon inspection, a cracked hose was discovered by the large antifreeze tank, they recommended replacing the hose, after which we'll try again to see if the DC charging starts. I'll keep you updated on what happens.

 

[mg4comfort]

I updated to R59 and it still didn't work, but I went to the MG representative and they opened a file with the errors for me, which they sent to MG China. I'm waiting for them to call me to see what they decide.
Upon inspection, a cracked hose was discovered by the large antifreeze tank, they recommended replacing the hose, after which we'll try again to see if the DC charging starts. I'll keep you updated on what happens.

Is the problem solved? How is it solved? We have the same problem.

 

[Gismo]

Cold comfort, but I have a similar issue.
Picked up my 'new' MG4 ER (it had just over 1000 miles on the clock, registered 30/06/25 and used as a demonstrator) three weeks ago and it charged fine on my 7kW wall charger.
Nine days after getting it we went on holiday and, as it was a 260 mile trip, called in for a charge on the motorway. It wouldn't charge a.t several of the Gridserve chargers (never had that problem with the LEAF that it replaced). Diverted to try at the hub near Buckfastleigh. Again no charge, but message on charger said 'vehicle requested charge stop'.
Called MG Assistance and they said AA would attend, but not until 6:00pm. So we cancelled their attendance and continued to our hotel, a total of 270 miles travelled. Called next day to re-arrange AA attendance.
Unfortunately, when the AA patrol arrived the charge was down to ~40 miles range and the gear selector only allowed P or N (not Drive or Reverse). They tried the 'disconnect the 12v battery and re-boot trick' - it didn't work. List of error messages now showing (starting with Charge Port Fault. but many others). AA arranged Relay recovery back to my local dealer and for a hire car for the next day (MH HS ICE, nice but thirsty). Holiday should have been relaxing but was ruined.
Dealer has had the car for two weeks - latest update 'problem discussed with MG and waiting for their OK to order spare parts'. I've e-mailed and asked for details of the 'problem' and what spares are required - no response yet.
As I've had the car for less than 30 days, I guess I could reject it, under the Consumer Protection Act, and claim a full refund (including all associated costs) but I was enjoying the car until it was, obviously, 'not-fit-for purpose'.
So, still waiting patiently and using the FIAT 600e they've loaned me.

 

[Gismo]

After 4 weeks the dealer has contacted me with an update. Seems that the problem was the Electrical Distribution Module and they have now received a replacement that they plan to fit early next week. So, 'fingers-crossed'. (But I'm still unclear why the EDM failed or why charging on 7kW/hr charging still worked at the dealership)

 

[Chrisdriving]

3 phase?
My model 3 had this issue.

 

[Gismo]

Well four weeks further on and no update from dealer - so I guess that replacing the EDM didn't solve the problem. Tried contacting them by email and 'phone (many times), but the 'service update' number goes unanswered. Wouldn't mind the lack of communication that much, but they do have my email address and mobile number. Is it too much to ask for a text or email update?
I don't know if they're using a three-phase charger - looked like a standard 7kW wall box to me,
I'll keep on using the 6ooe they've loaned me while they 'fix' my 'new' MG4 Trophy ER - at least the miles and tyre wear is on that and not the MG. The FIAT's not bad, but you're lucky to get much over 200 miles in the cold.

 

[LenEV2016]

Well four weeks further on and no update from dealer - so I guess that replacing the EDM didn't solve the problem. Tried contacting them by email and 'phone (many times), but the 'service update' number goes unanswered. Wouldn't mind the lack of communication that much, but they do have my email address and mobile number. Is it too much to ask for a text or email update?
I don't know if they're using a three-phase charger - looked like a standard 7kW wall box to me,
I'll keep on using the 6ooe they've loaned me while they 'fix' my 'new' MG4 Trophy ER - at least the miles and tyre wear is on that and not the MG. The FIAT's not bad, but you're lucky to get much over 200 miles in the cold.

I've banged on about often enough cars have faults, all brands but MG seems especially bad at communication.
As you say a quick email, text or call isn't too much to ask. Even if it is there is no update yet but we are continuing to work on it

 

[Ian Key]

Well four weeks further on and no update from dealer - so I guess that replacing the EDM didn't solve the problem. Tried contacting them by email and 'phone (many times), but the 'service update' number goes unanswered. Wouldn't mind the lack of communication that much, but they do have my email address and mobile number. Is it too much to ask for a text or email update?

I see you are in Derby. Which dealer is your car with?

 

[Gismo]

The car was with Stoneacre (T/A Clock Garage) in Spondon.
After further emails/phone calls I was told that MG Technical had recommended replacing the CCU - but Clock had to wait for the Warranty Dept to authorise funding. That was before Christmas. In early January (2026) I was told, (when I chased them) that MG Technical had now recommended changing the 'Charging Plug Harness'. Two weeks later and I had had enough - 16 weeks without the car - so I sent a letter rejecting the car under The Consumer Rights Act 2015.
Strangely, within two hours of signing for the letter, they left a message that the car was ready for collection.
Had a meeting with a 'Business Manager' the following weekend - as they hadn't contacted me about the rejection - and confirmed my rejection. They agreed to refund the invoice price - per the Act - but applied a retrospective charge of £14.99/day for the 'courtesy' car. So that's ~£1800 off the refund. I argued, but he said the charge was in their standard T's & C's where a vehicle was rejected. It was either accept the reduced refund or talk to a solicitor.
Not impressed - won't be shopping there again EVER.

 

[Ian Key]

The £14.99 per day is for the insurance. If you had the courtesy car covered fully comprehensive on your own insurance it would have been free.

 

[Gismo]

The £14.99 per day is for the insurance. If you had the courtesy car covered fully comprehensive on your own insurance it would have been free.

It's not the amount, it's the retrospective charging. If I had been informed upfront that I would have to pay £14.99/day for insurance, I would have had the opportunity to add the car to my fully comprehensive insurance or I would have rejected much, much earlier. I was only told, at the time, "don't worry, we'll keep you mobile with a courtesy car". As they were in 'breach of contract' under the Act, I could have claimed any additional costs associated with insurance or alternative arrangements (such as taxis, buses, etc).

 

[gary333]

In this example it's worth the money to take them to small claims court. I would ask them for a copy of their T&C's which state what they are saying.

 

[siteguru]

Terms which impose a potential liability must be clear and obvious, and brought to the consumer's attention. Such terms hidden in small print breach the Unfair terms part of the Consumer Rights Act - i.e. the Unfair Terms in Consumer Contracts Regulations 1999, and the guidance for the Consumer Rights Act 2015.

The Unfair Terms in Consumer Contracts Regulations 1999

These Regulations revoke and replace the Unfair Terms in Consumer Contracts Regulations 1994 (S.I. 1994/3159) which came into force on 1st July 1995.

www.legislation.gov.uk

Unfair contract terms

Guidance to help businesses make sure their contract terms and notices are fair and clear to consumers.

www.gov.uk

 

[Gismo]

I know about the Unfair Terms (which may have been hidden in small print) but as I had no 'paperwork' with the 'courtesy car' I had no opportunity to see it. I considered Small Claims, but I had to sign a document stating that I would take no further action against Stoneacre in order to get the (reduced) refund. As I had returned the 'courtesy car' immediately on being informed of the charge, I needed my money back to get a replacement (it still took a week to get the money into my account, so that was another fortnight without my own transport) and it could have taken weeks/months if I had to go through the courts.
I didn't dislike the car - in fact I now have a '75 plate' MG4 Ext Range - it was the process and lack of meaningful communication or transparency. Needless to say, I didn't buy the new one from Spondon.
You live and learn - perhaps I'll be able (through Google Review, Trip Advisor...) to provide them with £1800 worth of 'advertising'.