You may have more luck getting answers on the MG4 forum, looks likely an issue with the car though, first step is usually to disconnect the 12V aux for a few min, then try the granny supplied with the car
… or they used the original infotainment unit to repair another car (quite common with demo models) and replaced it with a SE version without noticing?
Agreed, it’s rather an issue with this specific pack than a general problem:
https://www.mgevs.com/threads/what-depth-of-water-can-an-electric-car-mg-go-through.14115/post-239517
Modern HV battery packs are waterproof.
That’s an easy fix, open the lid and let it dry out?
That’s most likely the price for a replacement pack, not a repair
The battery is temperature controlled by a liquid medium, not sure what color it is?
The important word here is ‘can’, if this is...
As mentioned, the actual work can be done in a day. What takes time is to get ‘all your ducks into a row beforehand I.e diagnose the problem correctly, get authorisation from MG to proceed, organise necessary tools/spares and find someone qualified and certified to do this job.
From experience...
It’s possible to remove a HV battery, open it up and replace a faulty cell within a day (I have done that myself, not on an MG5 though).
Most EV manufacturers actually don’t train ordinary technicians to do this kind of work as one has to cut trough a mountain of red tape to do this ‘above...
The only modes the heating is actually working (not just blowing air around) is when the car is READY to drive or during the preheat function via the app (car locked).
It’s highly recommended to externally charge even a brand new 12V aux overnight as you don’t know how long it’s been sitting on a shelf.
The car will shut down immediately once the 12V aux goes below a certain limit (11.8V is too close for comfort imho), regardless of the SoC of the main battery.
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