MG ZS HYBRID+ Gets Fix After Acceleration Issue Exposed by CarSauce

MG Australia has announced a software update for the 2025 MG ZS HYBRID+ after independent testing by CarSauce revealed a significant discrepancy in the vehicle’s acceleration performance under specific conditions. During CarSauce’s testing, the ZS HYBRID+ recorded a 0–100km/h time of 24.59 seconds when the 1.83kWh battery's state of charge (SOC) was depleted.

This performance fell well short of MG's official claimed time of 8.7 seconds. However, once charge was restored to the hybrid system through regenerative braking, the ZS HYBRID+ completed the same sprint in 8.04 seconds, surpassing the manufacturer’s claimed figure.


This disparity highlights a limitation in the vehicle's hybrid system, where power delivery becomes heavily reliant on the battery’s charge level. While the hybrid system is designed to blend the outputs of its 1.5-litre four-cylinder engine and 100kW electric motor for a total output of 158kW, the depleted SOC appeared to reduce the system's ability to deliver consistent performance.

Such variability could pose challenges in real-world scenarios, particularly during overtaking or merging, where acceleration needs to be predictable and responsive.

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All article: mg-zs-hybrid-gets-fix-after-acceleration-issue-exposed-by-carsauce
 
Positively, from Wakefield to Runcorn tonight I had no issues
Lovely, your car behaved today .... and I do genuinely hope that continues. But that's how I recall motoring in the 70's with my Triumph Herald and mk 3 Cortina .... "will it get me home tonight?"...

But in 2025, surely it is a fair assumption that technology and quality have advanced so we don't have to pray that our cars will start, run and get us there - I had years of that with no nostalgia or wish to repeat it.

Renault are known for niggly electrical issues and yet I had a Grand Scenic that ran for 300,000 miles with few problems. I struggle to imagine an MG reaching a fraction of that without many workshop visits and driver anxiety.

The MG styling and marketing guys have done an excellent job in making these cars very attractive. The engineering and manufacturing need to back that up, it doesn't seem they are there yet, sadly.

The MG name may be a century old, but this is a recent badged import without the local infrastructure yet to fully support it. I hope that improves very soon.
 
I'm so glad i stumbled on this forum, thanks for all your honest views on your real life experiences of this otherwise fine car, let down by poor backup.

I drove the original ZS four years ago, quite basic and crude then, but the latest ZS hybrid+ tested last week is a significant step up from that - on the surface! And the HS is a real beauty, loaded with features and oozing apparent quality and alure. However, would i want to live with running issues, and poor warranty backup for 3 years? I don't think so. It seems the brand still has a long way to go to shake off the reliability, parts shortage and whole backup confidence issues.

Contacting MG customer service about this power loss issue gave no result, a week later and no reply. And the MG dealer staff don't know when asked specifics about running issues or warranty backup - they just want to make a sale and will say almost anything to clinch a deal and secure their monthly bonus!

I went through the 'impressive' 7 year warranty with their service manager and concluded that apart from the mass of 'wear and tear' exclusions, most parts are barely covered for 3 years, the only thing covered for 7 years is the body. This is all very sad as I was almost sold on the brand this time round, but - if it looks too good to be true, it probably is!

I'm sorry to hear that MG is disappointing even before the purchase. However, this seems more like a lack of interest and competence from some dealership employees in the UK, who should be providing support and having confidence in the cars they sell.

I'm picking up my car in February. Initially, I was also worried about negative comments. But I know that an update was released within 1.5 months of the issue being reported and showcased by CarSauce, and based on feedback from French Facebook groups, it appears to be largely effective (if it doesn't work for someone, it's worth disconnecting the battery terminals for 2 hours to clear the system cache after the update—apparently, this helps in some cases).

Of course, critical voices are valuable as they push manufacturers to take action. But on the other hand, I wonder how serious the problems really are, and to what extent they are just complaints from individual users. Many of them don’t really understand how hybrid cars work and have habits from driving diesel or petrol cars. Today, I saw someone complaining about fogged-up windows. Fortunately, he posted a video showing that he were driving on a wet day with the air recirculation on and the AC turned off… Yet, of course, the user first blames the car instead of understanding the basics of its (or every car actually) operation.

The MG ZS has already sold in thousands of units since its European launch (in December alone, around 3,000 units were sold in the UK). On forums, I’ve seen only a handful of complaints, mostly from users driving in mountainous terrain. I don’t see any mass hysteria. Negative comments on forums or under YouTube videos often come from the same users. Usually haters that do not own the car or driven it at all. MG acted very quickly. Unfortunately, as people, when something bothers us, we are eager to complain publicly. But when we are satisfied with something, we rarely feel the urge to express it on a forum. That’s just human nature.

Eight years ago, I bought a Citroën C3 right after its release. When I purchased it, the dealers assured me that an update enabling Android Auto support would be released soon. I waited and kept checking for updates for months. The update finally arrived about 1.5 years after I bought the car. Later, more problems with the PureTech engines surfaced. Did the manufacturer listen to me? Did they take responsibility for the defective engines? No, and I don’t think they ever will. I am now forced to sell the car at a significant loss because no one wants to buy it, knowing about the issue.

My other car is a Škoda Octavia IV, less than two years old. I’ve already had three breakdowns that practically immobilized the car. In two of these cases (a failure of all systems), the manufacturer did nothing significant—just cleared the errors and supposedly installed an update. But the problem returned over time. I managed to fix it again by briefly disconnecting the battery, and I didn’t go back to the dealer because the experience wasn’t pleasant. I also don’t feel like I was taken seriously by the service.

Problems most likely affect all cars, especially new ones, fresh after release. They need to be reported to dealers so manufacturers can introduce fixes. But at the same time, we can’t expect every single issue to be addressed—when selling hundreds of thousands of units, it’s simply impossible.

As for the warranty, I’m not sure what applies in the UK. The European MG website lists the warranty terms for cars from 2021 onward. According to it, everything is covered under warranty, including wear-and-tear parts like wipers, for the first two years. Exclusions apply only to multimedia, driver assistance systems, and paint which are covered for three years (although corrosion protection lasts longer). So, what you mentioned might not be entirely accurate if the rules in UK are same as in the whole Europe.

Once I pick up my car in a few weeks, I’ll try to write a more detailed review, including both positive and negative impressions.
 
Having had the hybrid trophy since October can honestly say have had no issues with it drive mostly in normal mode on regeneration 2 and use sport when needs be for Pulling away or overtaking. Getting good mpg and for the price paid with discount I received am more than pleased. Rather than overthinking just drive it predominantly most reviews have been positive with no problems. Have drove up steepish hills and it performed fine hopefully I continue to enjoy trouble free motoring.
 
Purchased our new MG ZS Trophy in January 2025 and with a few minor issues I and my wife have been very pleased with the car. Generally it performs well however I and my wife have both noticed an issue when climbing slopes. Generally the slope is gentle and we are driving at the speed limit or even less, without moving the accelerator pedal suddenly the revs increase but the speed stays the same. At the end of the slope nothing changes until the accelerator pedal is released and then the revs drop and often the car reverts to EV mode. I asked the question at our local MG dealer but the person I asked had no idea why this would happen. Having read the previous information another enquiry will be made.

Ken
 
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Someone on a french group mentionned a minor released from mg motor for the zs hybrid.
Released the 14th of January, pd05.2001

I guess it's just the pd052.. but maybe they added a light modification to the initial pd052 ? Anyone got any information?
 
Generally the slope is gentle and we are driving at the speed limit or even less, without moving the accelerator pedal suddenly the revs increase but the speed stays the same. At the end of the slope nothing changes until the accelerator pedal is released and then the revs drop and often the car reverts to EV mode
Presumably, the engine is simply recharging the HV battery. Slopes require a lot more power to maintain a constant speed than flat roads. I don't think that this is anything unexpected. The people at the dealer should be aware of this.
 
MG in France has communicated with a pdf file sent to all the dealers, showing the PD052 update with the details of the issue supposed to be fixed or mitigated. You can find more details even on some youtube videos explaining and showing the document.
 
Anyone who thinks that the update reduces the revving is unfortunately wrong, it is rather the opposite, the combustion engine revs up more often.
I tried it once on a flat stretch with a warm engine and more than 50km/h battery almost full at 1300-1400rpm, battery approx. 50% full 2200-2400rpm, battery empty except for two strokes 4300-4500rpm.
Furthermore, when the engine is not warm, it also lacks some power when accelerating over 100km/h. It is warm just before 4 strokes, actually at 3.5 strokes and then the rpm drops noticeably at the same speed, around 1000rpm.
The revving up is required in serial operation so that the generator can produce the maximum possible energy. A four-speed automatic with a better transmission ratio to the alternator could have been the solution. Unfortunately, the setting of the interior temperature also plays a major role in when and how often the combustion engine runs.

So put on thick clothes and switch on the seat heating and then switch off the air conditioning/heating. LOL
 
I have had the update 7 weeks now and have not had the issue that you speak of.I do find when the engine is heated up and at 4 bars that the car is sweet to drive.
 
whilst on a slightly different tack relating to ‘software’, the mapping in my MG3 Trophy Hybrid+ is now 12 months old. Having had earlier 3’s, I have always updated maps on purchase. I have now spent the last 6 months mailing the MG CST, and am now advised that there are no current plans to update the maps. To add to the confusion, it depends on who you contact at CST, generally they say, including the latest who advised no plans for an update, NaviExtras, whilst another last October advised the maps are from ‘ivo-mapmaker.soimt/com’. Update will require the usual ‘finger print and Chassis’ number, similar to NE. Checking the car, there is no software installed to enable an update, but was then advised software would be installed at a later date! It seems that MG UK have serious CST problems, as well as the highlighted software problems.
 
My car is having the PD052 update as I type. 🤞
Getting a few alarms coming through on the app about tyre pressure. 🙁
Screenshot_2025-03-03-15-39-49-109_com.saicmotor.iov.europe.jpg
 
Just picked my car up from MG Shrewsbury.
The chap I spoke to said the technician had applied an update to the PEU and all my other software was already updated.
He could not confirm if the update was PD052.
He said they had test driven the car but couldn't recreate the over-revving issue.
His only suggestion was for me to video the over-revving, which isn't going to be easy when I'm driving, but I'll give it a go.
They refused to look at the comments and issues raised on this forum.
Any advice is welcome. 👍
 
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