MileageCurve What breaks, and at what mileage

Hyundai Sonata 2020–2025

8th generation (DN8) · DN8 · 816 complaints, 135 with mileage

Owners filed 816 complaints with NHTSA about the 2020–2025 Hyundai Sonata, and 135 of them record the mileage at which the failure happened. That is enough to show not just what fails, but when.

47% of failures fall within the first 12,000 miles. Failures clustered that early usually indicate a design or manufacturing problem rather than wear.

The most-reported areas are the engine (14.7% of complaints, typically around 14,698 miles), the transmission and driveline (11.4% of complaints, typically around 15,000 miles), the fuel system (4.3% of complaints, typically around 76,262 miles).

9 recall campaigns cover this generation.

When failures happen

0–5k: 55 complaints (40.7%)0–5k5–10k: 6 complaints (4.4%)10–20k: 18 complaints (13.3%)10–20k20–30k: 7 complaints (5.2%)30–40k: 3 complaints (2.2%)30–40k40–50k: 12 complaints (8.9%)50–60k: 4 complaints (3.0%)50–60k60–70k: 3 complaints (2.2%)70–80k: 5 complaints (3.7%)70–80k80–90k: 10 complaints (7.4%)90–100k: 4 complaints (3.0%)90–100k100–120k: 4 complaints (3.0%)120–140k: 2 complaints (1.5%)120–140k140–160k: 2 complaints (1.5%)160–200k: 0 complaints (0.0%)160–200k200k+: 0 complaints (0.0%)550

10% of failures occur by 449 miles · a quarter by 1,400 · median 14,698 · three quarters by 50,000 · 90% by 89,000. Based on 135 complaints that record mileage.

What fails, and when

SystemComplaintsShareTypical mileageMiddle half
Fuel/Propulsion System12615.4%
Engine12014.7%14,6982,000–47,000
Electrical System9711.9%
Power Train9311.4%15,0002,000–21,000
Unknown Or Other8610.5%
Forward Collision Avoidance496.0%
Fuel System, Gasoline354.3%76,26250,200–92,000
Structure323.9%1,500520–47,000
Vehicle Speed Control313.8%
Seats202.5%

By model year

YearComplaintsWith mileage
202026372
202117927
202214216
202314012
2024727
2025201

Which systems, and when

Complaints about this generation are not spread evenly across the vehicle, and the systems that generate the most of them do not all fail at the same point in a car's life. The median failure across all systems here is 14,698 miles; the figures below show which parts of the car run ahead of that and which run behind.

The engine accounts for 14.7% of complaints (120 reports, 19 of them with a mileage figure), with a median of 14,698 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 2,000 and 47,000 miles.

The transmission and driveline accounts for 11.4% of complaints (93 reports, 19 of them with a mileage figure), with a median of 15,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 2,000 and 21,000 miles.

The fuel system accounts for 4.3% of complaints (35 reports, 28 of them with a mileage figure), and it fails late — a median of 76,262 miles, considerably beyond the vehicle's overall median. That pattern is consistent with normal service life rather than a defect, though it matters for anyone buying an example already near that mileage. The middle half of these reports falls between 50,200 and 92,000 miles.

Body structure accounts for 3.9% of complaints (32 reports, 11 of them with a mileage figure), and it fails early — a median of 1,500 miles, well before the vehicle's overall median. Failures clustered this far below the rest of the car usually point to a design or manufacturing problem rather than wear, because wear does not selectively target one system on low-mileage examples. The middle half of these reports falls between 520 and 47,000 miles.

Differences between model years

Within this generation, complaint volume is not constant across model years. The 2020 model year drew the most — 263 complaints — while 2025 drew the fewest at 20. The median year sits at 141.

The first year of the generation, 2020, sits above the median. That is a common pattern — early production of a redesigned vehicle tends to surface problems that later years do not repeat — and it is worth weighing when choosing between years.

Recalls and what they cover

NHTSA records 9 recall campaigns covering vehicles in this generation. A recall means the manufacturer or the regulator concluded there was a safety defect or a standard was not met, and that a free remedy is owed to owners — including second and later owners.

The campaigns cluster around the fuel system (2), the transmission and driveline (2), the exterior lighting (1). Repeated recalls against the same area of the car generally mean the first remedy did not fully resolve the underlying problem.

Recall status is specific to the individual vehicle, not the model. Checking a VIN against NHTSA's lookup is free and takes under a minute, and it is the only way to know whether a particular car has had the work done.

Reported severity

Of the 816 complaints filed against this generation, 51 reported a crash; 3 reported a fire; 42 reported an injury. Crash-involved reports represent 6.2% of the total.

These are owner-reported outcomes, not verified investigations, and they are not adjusted for how many of these vehicles are on the road. They are included because the distinction between a fault that strands a car and a fault that causes a collision is the one that matters most, and it is not visible in a complaint count alone.

What this means if you are buying one

For a buyer, an early-failure pattern is comparatively good news on a used example: 47% of the reported failures occur in the first 12,000 miles, which on a car of this age means they have already happened or they were never going to. Service history matters more than mileage here.

On inspection, the engine and the transmission and driveline are where this generation's reports concentrate, so those are the areas worth a specific look. The engine in particular shows a median failure mileage of 14,698, which gives a concrete number to compare against the odometer of any car you are considering.

None of this is a substitute for a pre-purchase inspection on the individual car. Aggregate patterns describe a population; the example in front of you has its own history.

Documented problems

Brakes / electrical 2020-2021

ABS hydraulic control unit can short internally and ignite while parked; subject to recall with an interim instruction to park outdoors.

Anti-theft 2020-2021

Trims without an engine immobilizer are trivially hot-wired, producing a large theft loss pattern and insurer refusals. Hyundai issued a software countermeasure rather than a recall.

Recalls (9)

CampaignDateComponent
25V7960002026-03-09Fuel System, Gasoline
24V5830002024-09-12Exterior Lighting:Brake Lights
23V5260002023-09-07Power Train:Automatic Transmission:Fluid/Lubricant:Pump
22V7460002023-01-10Power Train:Automatic Transmission
21V00M0002022-06-20Visibility:Windshield
22V1960002022-05-26Latches/Locks/Linkages:Trunk Lid:Latch
21V5240002021-09-03Fuel System, Gasoline:Delivery:Hoses, Lines/Piping, And Fittings
20V2130002020-06-03Electrical System:Software
20V1220002020-04-22Equipment:Other:Labels

What owners reported

2020 · 1 miles · Engine
VEHICLE ABRUPTLY STOPPED IN A TRAFFIC SIGNAL WITHOUT GIVING ANY INDICATIONS WHAT SO EVER. WHEN TRIED TO RESTART IT STALLED PRETTY BADLY CAUSING EXCESSIVE VIBRATIONS. THIS HAD JUST 1900 MILES ON IT. VEHICLE DIDN'T HAVE ANY MIL OR ANY VISIBLE INFORMATION ABOUT THE ISSUE. IT CREATED A HUGE TRAFFIC PILE UP DUE TO THE PEAK HOUR IN WHICH THIS PROBLEM STARTED. FEW DAYS AGO THERE WAS ISSUE WITH STARTING …
2020 · 1 miles · Power Train
VEHICLE ABRUPTLY STOPPED IN A TRAFFIC SIGNAL WITHOUT GIVING ANY INDICATIONS WHAT SO EVER. WHEN TRIED TO RESTART IT STALLED PRETTY BADLY CAUSING EXCESSIVE VIBRATIONS. THIS HAD JUST 1900 MILES ON IT. VEHICLE DIDN'T HAVE ANY MIL OR ANY VISIBLE INFORMATION ABOUT THE ISSUE. IT CREATED A HUGE TRAFFIC PILE UP DUE TO THE PEAK HOUR IN WHICH THIS PROBLEM STARTED. FEW DAYS AGO THERE WAS ISSUE WITH STARTING …
2020 · 6 miles · Forward Collision Avoidance
The contact leased a 2020 Hyundai Sonata. The contact state that the radar in the vehicle interacted with the radar in Ford vehicles. While parking in a parking spot there was a beeping sound detected. While at a stoplight with a vehicle in front to the side, the radar engaged when a Ford vehicle drove up. The contact stated while turning nearby another Ford vehicle the radar engaged and the dri…
2020 · 449 miles · Electrical System
THE VEHICLE'S FUEL GAUGE (TYPE C) DOES NOT ACCURATELY ADJUST FOR CHANGES IN THE AMOUNT OF GAS IN A TIMELY MANNER. IT NORMALLY TAKES 2-3 DAYS FOR THE GAUGE TO MOVE TO FULL TANK EVEN THOUGH IT IS FULL. SAME PROBLEM FROM 1/4 TO 1/2 TANK, ETC. FOR EXAMPLE, I NOTICED THE PANEL SAID I HAD 11 MILES TO EMPTY ON FRIDAY. THE GAS GAUGE SHOWED OTHERWISE. I WASN'T NEAR MY USUAL FILL STATION, SO I PUT 5 GALLON…

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