Unintended acceleration in 2024 MG4 Trophy LR

[EvilSeagull]

Generally this is the reason I'm not using OPD (One Pedal Driving) with my MG4 Luxury. You get way too used to playing with the accelerator and develop no muscle memory for the brake pedal.

When it comes to parking I'm constantly on the brake and just use the creep mode when lifting off. Anything happens I can just slam my foot down. With OPD you'd actually be on the accelerator (as the car is fully stopped otherwise) so if you get a freight you might depress the pedal.

And hopefully everyone here is only using one foot to drive, there are people who use both feet at the same time, which is madness.

Agree, I don't understand all the fuss about people praising OPD - saying that is so good and easy to use etc.

To me anything other than Regen 1 feels artificial, more like using a forklift or dodgems rather than a car.

Brakes on mg4 are blended anyway, so even in Regen 1 if you're smooth with a brake pedal - pads only get squeezed against the discs once you get to 3-4mph

Left-foot-braking though is a great skill to have, that's how I drive in every simulator, but the pedal in mg4 is a bit too sensitive in slow moving traffic, it's especially tricky when you want to suddenly ask for medium force. I can brake softly with my left or slam it, but stuff in the middle when something happens all of the sudden normally ends with an emergency stop lol.

 

[decrep]

I don't understand all the fuss about people praising OPD - saying that is so good and easy to use etc.

To me anything other than Regen 1 feels artificial, more like using a forklift or dodgems rather than a car.

Well we are all different.
I don't understand what you mean by "artificial". I guess you mean it's not like what you are used to in an ICE vehicle.
If you like what's different, it certainly doesn't feel "artificial". It's just a new challenge to master and get the benefits of.

I can see a problem with new drivers learning on OPD, they will not have the muscle memory of the brake pedal. But I find I have to use it enough in traffic for it not to be a problem.
Our car has an LFP battery so it regularly gets charged to 100%, and around the suburb this entails a lot of brake pedal use. I normally can't wait for battery to drop down below 90% so I can select OPD again.
Horses for courses.

I gave a mate a drive in ours yesterday, he had no idea what OPD is, not famillar with BEVs at all.
He's had all sorts of "hot" cars and enjoys driving them.
It took him a few 100m around the block to get at home with OPD, He was very impressed and loved it.
Fortunately he had to go back to work, otherwise I may have struggled to get the car back off him.

 

[Vlyn]

I mean I like the idea of ODP in theory, but you already mentioned a major downside: You can't use it all the time. Consistency is key for me while driving.

Besides things other people reported: Stopping on a hill with ODP can have the car lurch backwards.

Personally for me my foot starts aching when I have to ride the gas pedal for a long time, with high regen or ODP you constantly have to press down (and do it carefully so you don't accidently brake). ACC helps, but then ODP or not doesn't matter and switching off ACC sucks with ODP.

At low regen when I see cars ahead slowing down I just let go of the pedal and coast (Which is -5% battery regen). And when I need to stop I can use the first part of the brake for increasing regen, using the mechanical brakes only happens on emergency brakes or when I come to a full stop. I also get better efficiency overall and for me it's a more relaxed drive.

 

[tsedge]

I find the Adaptive regen setting is the best of all worlds because you get the light regen at high speed, which makes maintaining momentum easy, plus heavy regen at slow speeds, which makes traffic a doddle.

 

[gary333]

I find the Adaptive regen setting is the best of all worlds because you get the light regen at high speed, which makes maintaining momentum easy, plus heavy regen at slow speeds, which makes traffic a doddle.

It's a shame they didn't use the system Hyundai uses where it detects the car in front and constantly adapts the auto-regen to make the best of both worlds.

Setting my previous Ioniq in Level 0 and Auto-Regen was brilliant as it would allow the car to coast, then as you approach a car say at the traffic lights it would modulate the regen to perfectly bring the car down to 2-3mph where you would finally apply brakes. If the car moved off whilst it was slowing down it would then modulate auto-gen so you would start coasting again until you decided to press the accelerator.

 

[EvilSeagull]

It's a shame they didn't use the system Hyundai uses where it detects the car in front and constantly adapts the auto-regen to make the best of both worlds.

Setting my previous Ioniq in Level 0 and Auto-Regen was brilliant as it would allow the car to coast, then as you approach a car say at the traffic lights it would modulate the regen to perfectly bring the car down to 2-3mph where you would finally apply brakes. If the car moved off whilst it was slowing down it would then modulate auto-gen so you would start coasting again until you decided to press the accelerator.

I really enjoy the car, but when it comes to all 'self-driving tech' - it's just poor.

Earlier this year we went to Croatia, and got 2024 Corolla as a rental for a week.
That car had no power, manual petrol doing 0-60 in some 12 seconds...
But the ACC and LKA were fantastic - it was so smooth on both straight and twisty roads, I was especially impressed since the car was doing so well whether the road had white lines or not.

I just wonder whether MG4's problem lies simply in software - or maybe it is hardware with a lack of radar and a camera being of low quality.

 

[siteguru]

The MG4 does have radar.

 

[EvilSeagull]

The MG4 does have radar.

I just looked it up, you're right. I thought they all get installed in the bottom of front bumper.

There you go, everyday is a school day

Must be a bad software in that case.

 

[OriginalBigAl]

With thanks to Bricktop who put us right on this , the radar is not where you would naturally think it is ( behind that square panel under the reg plate ) but its above the reg plate towards the crease in the plastic bumper. The manual says keep it clear of dirt and snow but does not specify where. ?

 

[JonnyG]

This seems more frequent than we first thought and MG UK appear to turn their back on it And no foot on accelerator.

 

[Martinonline]

I thought the first instance the presenter gave has been debunked and that somewhere on this forum is the report on the second instance that said the road assistance firm paid for the repairs. Thus accepting liability for the crash if that is true.

 

[JonnyG]

The YouTube video above is new though ?

MG wants us to pay £500-plus to remedy rogue electric car

After charging, there was a power system malfunction but MG closed the case and insisted a safety check was at our own expense

www.theguardian.com

 

[Tig170]

... only had this with dodgy floor mats

 

[SUPERAL]

This is my reply in the MG5 forum to the same problem.. as follows
"MG, and the authorised dealership, having carefully examined the vehicle, have concluded that an error occurred not related to the car"
Or, in other words, driver error. The AA man is not just going to get in and select reverse. He is going to check drive, reverse and neutral, all before attempting to reverse. I bet he was distracted by the car load of passengers went to reverse but confused himself and had it in drive when it shot forward and he slammed the brake but missed and hit the accelerator. His report, driven by his professional pride will heavily blame the car. - Just my opinion of course."

Are there any other reported cases, in the world, of selecting reverse only for the car to move forward? I have been manoeuvring and have not selected the correct forward or reverse gear but this was all controlled by the slow speed. I for one do not believe the AA version.

 

[NikLiverpool]

There have been numerous occasions across different car brands where this supposedly happened.
It was never the case; not a single one that the car accelerated by itself.
It has always been driver error.
There has been only one case with a Toyota model where a combination of poor hardware (single point of failure) and a highly temperamental software could cause this.

As for pressing both the brake and gas pedal and the car accelerating because of this; this can not happen.
Get in your car, press the brake; hold it there and start slowly pressing the gas. The car will not move an inch.

I am not blaming anyone for hiding the truth of what happened. But mind can play tricks and within the panic of the moment people are convinced that they were hitting the brake when they didn't.

 

[Vlyn]

I also highly doubt that the car just accelerated when put into reverse. My take (as MG4 owner): When you come to a rolling stop and you try to select reverse too soon the car might refuse (with a warning tone). If you're not in a hurry you'll definitely notice that and the car stays in D mode.

So they might have rolled a little, tried to switch to R and immediately pressed the gas. Just that the car was still in D.

 

[gary333]

As for pressing both the brake and gas pedal and the car accelerating because of this; this can not happen.
Get in your car, press the brake; hold it there and start slowly pressing the gas. The car will not move an inch.

On a side note. Although you can't move the car by press the brake and then the accelerator, luckily you can do it the other way around i.e. press the accelerator and brake pedal (at lower speeds, and with light pedal activation) as that's one of the ways I scrub my brakes so they don't rust up.

 

[Vlyn]

On a side note. Although you can't move the car by press the brake and then the accelerator, luckily you can do it the other way around i.e. press the accelerator and brake pedal (at lower speeds, and with light pedal activation) as that's one of the ways I scrub my brakes so they don't rust up.

Huh, that works? How often and at what speeds do you do that?

The only trick I heard until now was switching to Neutral and braking.

 

[gary333]

Huh, that works? How often and at what speeds do you do that?

The only trick I heard until now was switching to Neutral and braking.

I do it down my street when setting off once a week or so.

I’m used to using either foot to brake so for me it’s easy enough to do, but for new people trying only do it when no cars are around as it’s a confusing feeling.

It’ll only do it on partial/small accelerator movement and light braking force, however must work well enough as my brakes were as new after 4 years on my previous Ioniq I used to do this on as well.

 

[Vlyn]

I do it down my street when setting off once a week or so.

I’m used to using either foot to brake so for me it’s easy enough to do, but for new people trying only do it when no cars are around as it’s a confusing feeling.

It’ll only do it on partial/small accelerator movement and light braking force, however must work well enough as my brakes were as new after 4 years on my previous Ioniq I used to do this on as well.

I researched this a bit more and this seems like a terrible idea. It can quickly overheat the discs or even damage components (they are not made to accelerate while fighting against the brakes).

So I guess I'll stick to braking hard a few times or switching to Neutral