Hot days = Warnings Galore

[eximo84]

Just wondering if anyone has similar issues. Seems my MG4 doesn't like being left to get hot and will begin alerting non stop about all various things like EPS, Speed warnings and collision assist etc...

After some time of driving (maybe cooled down) or a hard stop it seems to stop and things go back to normal.

Thing is EPS reduction does make the steering heavy. Car has already been in to the dealer who didn't find anything and applied some updates (unsure what updates).

I've also had this directly after a service as the car was left in the sun at the garage. Again car had to be returned for the garage to update something.

 

[MG Clive]

Not this week, but during the previous 'heat wave' I got into the car just to move it, and I had warning lights of all colours flashing at me, and oh boy, the seats were bloody hot.

Powering down and restarting cured everything (apart from the hot seats).

 

[salty]

Nope can't say I've experienced this. And we've had some bloody hot days this year, where it's been parked for hours, in the sun.

 

[ReintjeWA]

I can’t say I’ve ever had this problem during our hot Aussie summers, with outside temps reaching 40°C. But I do always cool down the interior remotely before getting in on those days.

Wasn’t there a thread a while ago about someone having issues on cold days that would go away when heating the cabin? I think they ended up suspecting condensation in the front sensor housing near the rear view mirror, but it can’t recall if that even got confirmed.

Edit; found these two threads:

E

Thread 'MG4 Systems Unavailable'

Jun 16, 2025

I am the proud owner of an MG4 in the small twin island nation of the Caribbean - Trinidad and Tobago.

I love the car but it has developed an unknown problem which has resulted in the following systems being unavailable:

• adaptive cruise control (acc) system
• lane keep assist
• forward collision system
• auto emergency braking system

Do you have any ideas about what can cause this?

• edwardbahaw
• mg4 systems troubleshooting unavailable
• Replies: 7
• Forum: MG4 EV Forum

R

Thread 'Driver assist failures - only when it’s warm weather'

Apr 26, 2025

Hi everyone - for about 12 months or so I’ve been experiencing multiple driver assist failures (ACC system currently unavailable, forward collision system currently unavailable, auto emergency braking system unavailable, driver drowsiness detection system fault) in my 2023 MG4 Trophy. The problem only happens when the weather is warm (15 degrees or higher and it’s sunny outside).

The warning messages come and go continually (every couple of minutes) while I’m driving and can be really distracting as each time they appear there are several warning “bongs”.

I took the car to my local...

• r6steve
• assist driver driver assist mg4 warm weather
• Replies: 9
• Forum: MG4 EV Forum

 

[Tuareg]

No such problems/warnings here in Cyprus where we get very hot summers. It's been above 30C here since early June, 40C+ some days.