Speed Recognition

[Dirk]

I have a 2025 HS PHEV trophy, less than 1 week old. Generally happy except for the awful speed recognition and subsequent "bongs". Outside of 30 and 5o zones, the system is ALWAYS wrong, for example on the M4 from Swindon to Bristol it claimed the limit was 40! I havent noticed it accurately notify the national limit at all, ever! Has anyone else got this problem before I contact the dealer?

 

[BarrieG]

Try following a continental bus on the motorway and watch it translate the 100kph sticker on the back of the bus to 100mph on your dash.
My Insignia did the same in the middle of Bristol

 

[Dirk]

Strangely it started to work again yesterday, national limits correctly identified as 60 or 70 - perhaps some OTA update?

 

[HStrophyPHEV2025rc]

@Dirk - For what it's worth, my car's infotainment was upgraded from R46 to R62 last week. Since then (because of roadworks) I've gone past a 'national speed limit' sign (white with black cross) 4 times (I normally don't go past one). Each time I've checked to see what my car says. Every time it instantly changes the display screen from a red 30 circle to a red 60 circle (correct) immediately after crossing the boundary.

From my memory, I think that in the past (R46) it used to show the white circle (with black line) symbol (instead of red 60 circle), but that could be a false memory in my aging head!

Naturally the system relies on the camera, so if it's cold/frosty, or rainy, or foggy, then the camera may not be working properly. That might explain it intermittently failing.

Oh, and I may be wrong but I don't think we ever get any OTA updates. I think only the garage can perform them, so (in theory) your intermittent problem is not explained by infotainment software updates.

 

[pdm1]

My car tells me the limit is 90mph in a 30 zone.

Another time it claimed the limit was 115mph. Very strange.

 

[Vipar]

I had a leaf get stuck on my front camera when I got home and noticed it I removed it no problems since.
On another point I had a drumming sound looked every where then found it was the sun visor which I had moved to my side window to block out the setting sun and had not made sure it was back in its correct position.

 

[fifi16]

I have a 2025 HS PHEV trophy, less than 1 week old. Generally happy except for the awful speed recognition and subsequent "bongs". Outside of 30 and 5o zones, the system is ALWAYS wrong, for example on the M4 from Swindon to Bristol it claimed the limit was 40! I havent noticed it accurately notify the national limit at all, ever! Has anyone else got this problem before I contact the dealer?

After 7 months of MG trying to make my XPower safe to drive, I had a final software update in August which made my speed recognition tolerable. Sorry I don’t know the number of the update but other replies have mentioned update numbers which may help. I would definitely recommend getting you software updates by your dealership - but don’t offer to wait, my update took over 24 hours!

 

[aerofurb]

My HS PHEV Trophy has recently lost the ability to recognise the 'national speed limit' sign. This means it recognises everything from 20 - 50 mph but when going past a national speed limit sign, it remains at the last limit sign it recognised.

It first did it a couple of weeks ago, then it came back a for a few days and then it's stopped working.

I'm guessing that FOTA updates do occur (hence the now it works, now it doesn't) situation with the car but, as with most manufacturers' major software updates have to be carried out by a dealer.

The entertainment software level is currently R62 as updated by the excellent dealer in Banbury (Evans Halshaw) back in May 2025 to cure the previous speed limit recognition and loss of star keys software issues.

No major trauma, I just switch off the feature before setting off along with a couple of other settings.

Now at 21000 miles in 14 months and still loving every drive.

 

[Dirk]

After my post on Thursday where it had started to work again, I am now back to before - ie 30 and 50 zone recognition only, no national speed limit. Bizarre and not what I expect from a 2 week old car. In addition my GPS has now stopped working as well. Multiple resets, no change. Having a chat with the dealer tomorrow....

 

[aerofurb]

I was out today and all the speed limit recognitions were working again - ie national limits have reappeared (60 and 70). Will see what happens tomorrow.

I normally run Google maps through Car Play and it's surprising how often the MG database/camera system differs from Google maps - and that isn't to say Google is always right, when there's a discrepancy it's often wrong. So whilst I feel your pain with a two week old car misbehaving, have faith - it's a great car overall.

Obviously your GPS issue needs looking at, hopefully the dealer will come up with a fix.

 

[Garmor]

Happened to me today on my 6 month old MGS5 Trophy. Fails to recognise anything above 50 MPH, i.e. national speed limit and motorway except for one incident it recognised a speed limit of 120 MPH ??????
Any fixes.

 

[Dirk]

I have a 2025 HS PHEV trophy, less than 1 week old. Generally happy except for the awful speed recognition and subsequent "bongs". Outside of 30 and 5o zones, the system is ALWAYS wrong, for example on the M4 from Swindon to Bristol it claimed the limit was 40! I havent noticed it accurately notify the national limit at all, ever! Has anyone else got this problem before I contact the dealer?

I took the car to the dealer, they refreshed the soft or firmware which cured the speed recognition and GPS. Working perfectly now.

 

[Garmor]

Resolved. I started up the SatNav and it seemed to reload or update as there was a loading status bar running. Once finished I went out for a drive and all speed limit signs were recognised again.

 

[Lovemyev]

Our S5 has suddenly started misbehaving with regards to speed sign recognition.
I have the warning turned on, because of the large amount of 20Mph speed limit restrictions in Wales.
Last week we had been travelling through a 20Mph limit and it was correctly showing the 20Mph symbol in the drivers cluster.
We turned into the super market and did our shopping, on returning down the same road ( 20Mph ) it failed to retain in the memory, the last know speed sign.
So as we travelled through the restriction, it was displaying a red circle ️ ( no number provided ) and just three horizontally spaced, black dashes in the centre.
Today we where travelling through a 60Mph limit, but it displayed the same red circle with the black dashes, no number present.
We then entered a 20Mph limit and it correctly displayed the correct 20 sign.
Then I made a right turn off the main road, into a 20 Mph road.
No sign present at this point, but the display changed back to the red circle again with no numbers present ??.
It never displays the figure 60 or 70 anymore either, just the same red circle with three black dashes ????.

 

[Garmor]

Our S5 has suddenly started misbehaving with regards to speed sign recognition.
I have the warning turned on, because of the large amount of 20Mph speed limit restrictions in Wales.
Last week we had been travelling through a 20Mph limit and it was correctly showing the 20Mph symbol in the drivers cluster.
We turned into the super market and did our shopping, on returning down the same road ( 20Mph ) it failed to retain in the memory, the last know speed sign.
So as we travelled through the restriction, it was displaying a red circle ️ ( no number provided ) and just three horizontally spaced, black dashes in the centre.
Today we where travelling through a 60Mph limit, but it displayed the same red circle with the black dashes, no number present.
We then entered a 20Mph limit and it correctly displayed the correct 20 sign.
Then I made a right turn off the main road, into a 20 Mph road.
No sign present at this point, but the display changed back to the red circle again with no numbers present ??.
It never displays the figure 60 or 70 anymore either, just the same red circle with three black dashes ????.

Try doing what I did and start up the SatNav to see if it updates the recognition.

 

[Lovemyev]

Try doing what I did and start up the SatNav to see if it updates the recognition.

Thanks - I will give it a go .
I have not used the Sat Nav on this car as of yet.
So, just booted up the Sat Nav for the very first time and I can see a 20 Mph sign in the bottom R/H corner of the centre screen, when I backed off the driveway.
Which does correctly suit / match the speed limit in our current location, which is encouraging.
But we have not passed any posted road signs along the road yet, so I can’t say for sure if it has worked properly or not.
Thanks for the top tip !.
I will let you know if it works or not.