I had that same error and need to get a new rear motor fitted as the error message kept happening. Took 2 months to get resolved as MG kept saying update software but this did not resolve the problem. My problem was solved by Arnold Clark East Kilbride. Get your garage to speak to them.
I have an MG4 and have been getting the yellow warning message for the last few months and it used to disappear. 2 weeks ago the car would not drive at all and had to get MG Assist out who could not resolve it either.
Car was towed back to my local MG Dealer and they have been trying to resolve...
High Voltage Battery Pack Mafunction
This error light appears very regularly my 5 month old MG4 Trophy and more often than not it vanishes after about 10 seconds.
Occasionally it comes on along with the note to Contact an MG authorised Repairer.
It can even cause the car to stutter violently...
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