AA man tried disconnecting and waiting 10 mins for mine, even tried 15 in case 10 wasn’t enough. Shorting with a spanner didn’t work, tried a few times but he didn’t try using an OBD2.
Dealer rang me after a few days to say they plugged In and charged up and I could collect, guessing they cleared the fault. They “said” they were in contact with MG but not sure if they were just saying that. Told me not to let it get less than 30% charge, which would obviously cut the range with the reduced 80% battery top up on fast chargers.
Hoping it’s really rare and now I have full RAC relay cover between them and MG connect one of them will have an OBD2 terminal. It does leave us worried to use a fast charger or use for long journeys or important journeys.