In the summer of 2012, a group of Nissan Leaf owners in Phoenix got tired of being told they were imagining things. Their battery capacity bars were disappearing, Nissan’s own executives were blaming a faulty gauge, and nobody official seemed interested in checking. So twelve of them lined up their cars on a Saturday and drove them, one by one, until each battery ran flat. The results were exactly what the owners suspected: some cars had lost a third of their range in under two years. A separate independent test that same year found one Leaf down to 60-65% of its original capacity, managing just 59 miles before it died. Because the Leaf was one of the first EVs anyone outside a tech blog had actually heard of, that story didn’t stay in owner forums. It became the reason your neighbour still thinks EV batteries wear out in a couple of years.
Here’s the thing though: ask most people today what’s going to fail first on an electric car, and they’ll still say the battery. It’s the priciest part, the least familiar, and the first thing any EV skeptic reaches for. Across the fleet as a whole, that’s just not where the data points. Batteries and motors are, for almost every EV on sale today, among the last things likely to strand you. What actually breaks is a lot more boring than a battery, and there’s a good story behind why so many people are still worried about the wrong thing.
Where the Battery Myth Actually Came From
The Phoenix test wasn’t a one-off. A few years later, a group of New Zealand EV owners calling themselves Flip the Fleet ran their own citizen-science investigation, this time on the newer 30kWh Leaf. Their numbers were startling: the bigger battery was losing health at roughly three times the rate of the older 24kWh pack, around 9.9% a year at just two years old. Nissan ended up shipping a software fix after the story went global.
Both stories share the same root cause. The early Leaf used a passively air-cooled battery, no pump, no coolant loop, just the battery sitting there absorbing whatever heat the sun and the drivetrain threw at it. In Arizona summers, that’s a genuinely bad place for a lithium-ion pack to be. Nearly every battery built since has active liquid cooling instead, keeping cells in a tight temperature band no matter what the weather’s doing outside.
The numbers back up how much that one change mattered. Battery analytics firm Recurrent tracks real-world EV batteries at scale, and its research shows why the Leaf’s reputation stuck around so much longer than the technology that caused it: roughly one in twelve EVs built between 2011 and 2016 needed a battery replacement. For cars built from 2022 onward, that number is 0.3%, about three in a thousand. Average degradation on a modern pack runs around 2-3% a year, which means most EVs are still sitting at 80-90% of their original range after 8 to 10 years, comfortably inside the battery warranties every manufacturer now offers. If you’re weighing up LFP against NMC chemistry for your next car, I’ve gone through exactly how that choice affects long-term battery health in my LFP vs NMC explainer, and if you want to know what’s coming after both of them, I’ve also covered the race toward sodium-ion and solid-state batteries that’s already reshaping how these packs get built.
What the Reliability Data Actually Shows
Two of the studies everyone in the industry actually reads back this up. J.D. Power’s 2026 Vehicle Dependability Study tracks owner-reported problems per 100 vehicles across nine categories, and it keeps ranking the battery and motor near the bottom of the list for EVs. Infotainment is the actual troublemaker, at 56.7 problems per 100 vehicles, more than double the next worst category. Frozen touchscreens, botched over-the-air updates, phones that won’t pair, that’s what’s really annoying EV owners, not the drivetrain sitting underneath it all.
Germany’s ADAC runs one of the biggest roadside breakdown studies in Europe, and its 2026 numbers tell a similarly reassuring story: four-year-old EVs break down at a rate of 6.5 per 1,000 vehicles, against 12.5 for equivalent petrol and diesel cars. Part of the reason is refreshingly simple. An EV drivetrain has around 20 moving parts. A combustion engine has more than 2,000. No timing belt to snap, no fuel pump to die, no exhaust system rotting through, no multi-speed gearbox grinding itself down.
So What’s Actually Going Wrong?
An analysis of roughly 2,500 EV warranty claims, gathered by Warranty Solutions Group across 2025, gives the clearest picture yet of what actually sends an EV back to the workshop. It’s a list of small, unglamorous parts, and each one has a reason for showing up as often as it does.
| Component | Share of claims | Why it fails |
|---|---|---|
| Central locking systems | 4.29% | Extra duty cycles from app control, auto-locking and keyless entry |
| Charge flap actuators | 3.57% | Exposed to weather, unlocks and re-locks every charging session |
| Suspension lower arms | 2.86% | Extra weight from the battery pack accelerates wear |
| High-voltage battery | 2% | Rare, but the failure buyers worry about most |
Central locking systems top the list at 4.29% of all claims. Same door lock actuators you’d find in any modern car, but EVs pile extra duty onto them, remote locking from an app, auto-locking on departure, keyless entry syncing in the background, all of it adding cycles a simple mechanical lock never had to survive.
Charge flap actuators come in at 3.57%. This is the little motor that pops the cover over your charging port. It sits outside, in the weather, right where the car meets a cable, and unlike a fuel filler flap it has to unlock and re-lock itself every single charging session. Over a car’s life, that’s an enormous number of cycles compared with a petrol flap that barely moves.
Suspension lower arms account for 2.86%. This one’s just physics. An EV battery adds several hundred kilos over an equivalent petrol car, and all of that weight runs straight through the suspension. Bushings and arms that were never built for the extra load wear out faster, and it shows up in the claims data.
The 12-volt battery doesn’t even appear in that warranty list, because it usually dies before the warranty claim stage, at the roadside. ADAC’s breakdown numbers put it behind nearly half of all EV callouts. Every EV still carries an old-fashioned lead-acid 12V battery to run the lights, the locks and the computers that wake the whole high-voltage system up in the first place, and those computers keep drawing on it even while the car’s parked, which is a harder life than a petrol car’s 12V battery ever had.
The Integrated Charging Control Unit, or ICCU, is rarer but nastier when it happens, and it’s mostly a Hyundai and Kia E-GMP story. This one part handles both the onboard charger and the DC-DC converter that tops up the 12V battery from the main pack, and it sits beneath the rear seat on top of the battery. When it fails, a car can lose 12V charging entirely, or in the worst cases just stop moving, often with no warning at all. Owners on Kia and Hyundai forums have traced the root cause to the unit’s MOSFET transistors overheating during high-load V2L (vehicle-to-load) sessions, along with capacitors that struggle with voltage spikes, exactly the two components Kia is redesigning at the hardware level for the EV3’s 2027 facelift, which says something about how the earlier software-only fixes held up.
Hyundai and Kia have already run two separate recalls trying to fix it, and a class-action lawsuit filed in April 2026 alleges the replacement parts have the same flaw as the originals. To their credit, Hyundai and Kia responded in Germany that same month by extending the ICCU warranty to 15 years or 300,000 km, whichever comes first, covering Ioniq 5 models built before April 2024, Ioniq 6 models before September 2024, and pre-facelift EV6 and EV6 GT models built before 15 June 2024, following Finland’s lead on the same move. Owner comments on that announcement suggest the fix still isn’t fully bedded in, with some post-2024 cars reporting fresh ICCU failures well within months of purchase, so the extended warranty looks like an acknowledgement that this one will keep costing Hyundai and Kia money for a while yet.
When Drive Units Actually Do Fail
There’s one real exception to “motors barely fail,” and it’s specific enough to name. Tesla’s Model S and X drive units, built before a running change in late 2023, use a rotor seal to keep coolant away from the motor’s internals. That seal wears out over time. Once it does, coolant works its way to the rotor bearings and eventually the stator, and long-time owners on Tesla Motors Club’s forum describe it as the cause behind the vast majority of drive unit failures on these earlier units. Independent shops have built entire businesses around a “coolant delete” fix that reroutes the coolant away from the rotor for good, which tells you how real the underlying flaw was.
Audi’s e-tron has its own version of the same problem. Front and rear drive units both use a liquid-cooled rotor sealed by a silicon carbide component, and when that seal goes, coolant floods the motor. Owners on Audi’s own e-tron forum have posted dealer quotes as high as £7,500 to replace a single affected unit, and Audi has already acknowledged the underlying cooling system issue in a technical service bulletin covering e-tron models built between 2019 and 2022. Croatian repair specialist EV Clinic, which has fixed large numbers of these units through its own workshop network, puts the real-world failure rate well above the roughly 25% commonly quoted in owner forums, though that specific figure is EV Clinic’s own field estimate rather than an independently audited statistic, so treat it as one specialist’s experience rather than a verified industry number.
None of this means motors are secretly fragile across the board. It means one specific failure mode, a coolant seal on a liquid-cooled rotor, has turned up on more than one manufacturer’s drive unit, and it’s a fair question to ask directly if you’re shopping for a used e-tron or an early Model S or X once the warranty’s run out.
What EV Clinic’s Battery Data Adds, and What It Can’t Prove
EV Clinic deserves its own section here, separate from the statistics above, because its data comes from a genuinely different place. J.D. Power and ADAC survey ownership experiences across the whole fleet. EV Clinic’s numbers come from roughly 2,000 high-voltage battery repairs handled across its own workshops over five years, and every single car in that dataset had already failed and been brought in to be fixed.
The company argues that State of Health, the percentage most dashboards and used-EV listings show, isn’t actually telling you what you think it is. Based on its repair records, it reports batteries failing at fairly low degradation levels while other packs with far worse capacity loss keep running for hundreds of thousands of kilometres, and it points to pack architecture, cell type and how a car was driven as better predictors of remaining life than the SOH number alone.
That’s a genuinely interesting claim from a shop that’s physically opened thousands of packs, but it’s worth being exact about what it can and can’t show. Because EV Clinic’s dataset only contains batteries that already failed, with no matching record of healthy batteries at the same degradation levels, it can’t actually establish whether SOH correlates with failure risk, or how strongly, the way a study covering the whole vehicle population could. A commenter raised precisely this point on EV Clinic’s own site, and the company acknowledged the limitation directly, while still maintaining that SOH isn’t something a workshop can use to clear or condemn a specific battery on its own. Read it as one specialist repair shop’s field notes worth knowing, not as a peer-reviewed statistic.
What This Actually Means If You’re Buying One
None of this makes EVs less reliable than petrol cars, the ADAC numbers say exactly the opposite. It just means most people are pointed at the wrong worry. Fretting over whether the battery or motor will fail is largely wasted energy on a modern EV, unless you’re specifically eyeing an early Model S, an X, or an Audi e-tron out of warranty, where it’s a real question worth asking the seller directly. For nearly everyone else, the smarter use of that energy goes toward checking software quality, how well small parts like door locks and charge flaps have held up, and how a specific model’s suspension has fared in the real world. The thing actually likely to leave you stranded on the side of the road is a dead 12V battery or a frozen touchscreen, not the battery failure most people still picture when they think about what could go wrong.
What This Actually Means If You’re Buying One
None of this makes EVs less reliable than petrol cars, the ADAC numbers say exactly the opposite. It just means most people are pointed at the wrong worry. Fretting over whether the battery or motor will fail is largely wasted energy on a modern EV, unless you’re buying a specific older model with a known drive unit weak point, in which case it’s a real question worth asking the seller directly. For nearly everyone else, the smarter use of that energy goes toward checking software quality, how well small parts like door locks and charge flaps have held up, and how a specific model’s suspension has fared in the real world. The thing actually likely to leave you stranded on the side of the road is a dead 12V battery or a frozen touchscreen, not the battery failure most people still picture when they think about what could go wrong.
FAQ
Do EV batteries really fail as often as people think?
No. Modern EVs with liquid-cooled packs have a battery replacement rate around 0.3% for cars built from 2022 onward, according to Recurrent. J.D. Power’s data consistently ranks the battery near the bottom of EV problem categories.
What actually breaks most often on an EV?
Based on recent warranty claim data, the most common failures are central locking systems, charge flap actuators and suspension lower arms. Separately, the 12-volt auxiliary battery accounts for nearly half of all EV roadside callouts, and infotainment or software issues make up the single biggest category of owner complaints.
What is an ICCU and why does it matter?
The Integrated Charging Control Unit combines a car’s onboard charger and the DC-DC converter that charges its 12-volt battery from the main high-voltage pack. It’s a known weak point on Hyundai and Kia’s E-GMP platform, where failures can knock out 12V charging or, in the worst cases, cut drive power while the car’s moving. Hyundai and Kia extended the ICCU warranty to 15 years or 300,000 km in Germany and Finland in April 2026 for affected pre-facelift models, and Kia is expected to introduce a hardware-level fix with the EV3 facelift.
Do EV motors ever actually fail?
Rarely across the fleet as a whole, but there’s a specific, well-documented exception. Early Tesla Model S and X drive units (before a running change in late 2023) and Audi e-tron front and rear drive units both use a coolant seal known to wear out and leak into the motor. It’s worth asking about directly on those specific models, not something to worry about across EVs generally.
Are EVs more or less reliable than petrol cars overall?
More reliable, according to ADAC’s 2026 study, which found four-year-old EVs breaking down at less than half the rate of equivalent petrol and diesel cars. Far fewer moving parts in the drivetrain rules out entire categories of mechanical failure petrol cars still have to deal with.
Featured Image Source: mylemon.com
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