Is the Mercedes-Benz C-Class more reliable than the Hyundai Ioniq 6?

No. The Ioniq 6 comes out well ahead, by a large gap. It drew 0.9 complaints per 10,000 sold, against 18.3 for the C-Class. The C-Class also has problems in five major areas, while the Ioniq 6 is mostly hit by one fault, ICCU failure.

Which has more recalls, the C-Class or the Ioniq 6?

The C-Class, by a wide margin. Federal recall records show 767 recalls across its 8 model years, while the Ioniq 6 has 13 across 4 model years. The Ioniq 6 is newer and has fewer model years, but the C-Class total is still far higher.

What is the biggest problem with the Hyundai Ioniq 6?

ICCU failure. Owners describe a power supply warning, then limp mode near 22 mph, and sometimes a shutdown in traffic or on the highway. The 12-volt battery often dies too, so the car needs a tow. Some failures came back after a replacement, and parts can take weeks.

What goes wrong with the Mercedes-Benz C-Class?

Electrical faults lead, with 323 complaints. Owners report a 48-volt battery warning, sudden loss of drive power, a draining 12-volt battery, and blank center screens. Engine misfires, steering wheel shake at 45 to 65 mph, and loose roof panels near the panoramic sunroof also appear.

Which model years of the C-Class and Ioniq 6 should I avoid?

Avoid the 2020 and 2021 C-Class, its weakest years. For the Ioniq 6, 2023 and 2024 are the weakest. Newer years of both have fewer complaints partly because they have had less time on the road, so a short record is not proof of a better car.

Last updated: 2026-10-10

Hyundai Ioniq 6 vs Mercedes-Benz C-Class: Reliability Compared

More Reliable

Hyundai Ioniq 6

Good

Mercedes-Benz C-Class

Mixed

Reliability favors the Hyundai Ioniq 6 by a wide margin over the Mercedes-Benz C-Class. Owners filed far fewer complaints per car sold, and the C-Class carries many more recalls plus crash-linked problems in steering, electrical, and power train.

How Do the Hyundai Ioniq 6 and Mercedes-Benz C-Class Generations Compare?

Most used Mercedes shoppers will land in the fourth generation (W205), which covered US model years 2015 to 2021 and was facelifted for 2018. That puts the weak 2020 and 2021 years at the end of its run. The fifth generation (W206) began with the 2022 model year. For the Ioniq 6, every used example comes from one first generation (CE) that started with the 2023 model year and was facelifted for 2025. The early 2023 and 2024 cars and the facelifted cars are the main choices. The 2025 facelift is the newest version and has the shortest record.

Verdict

The Hyundai Ioniq 6 is more reliable than the Mercedes-Benz C-Class, scoring 77/100 vs 55/100.

Reliability favors the Ioniq 6 by a large margin. Owners filed far fewer complaints per car sold, and federal recall records show 13 recalls across its model years against 767 for the C-Class. The C-Class spreads trouble across electrical, engine, power train, steering, and structure, with several of those areas linked to crashes. The Ioniq 6 has one dominant fault, ICCU failure, which is serious but narrow. Its short track record means the picture could still shift as the cars age.

Key Differences

1Hyundai Ioniq 6 has 754 fewer total recalls
2Hyundai Ioniq 6 scores 22 points higher in reliability
3Hyundai Ioniq 6 has 17.4 fewer complaints per 10k sold

Category Scoreboard

3Hyundai Ioniq 6

—

0Mercedes-Benz C-Class

Reliability ScoreTotal RecallsComplaint Rate

Hyundai Ioniq 6 vs Mercedes-Benz C-Class: Which Is More Reliable?

Hyundai Ioniq 6 vs Mercedes-Benz C-Class at-a-glance reliability comparison
Metric	Hyundai Ioniq 6	Mercedes-Benz C-Class
Reliability Score	77/100	55/100
Years Tracked	4	8
Total Recalls	13	767
Complaints per 10k Sold	0.9	18.3
Year Wins	2 (1 tied)	0 (1 tied)

What Are the Common Problems With the Hyundai Ioniq 6 and Mercedes-Benz C-Class?

Sudden power loss shows up in both cars, but for different reasons. On the C-Class, a 48-volt battery warning can be followed by a coolant alert and a coast to a stop, and engine misfires and worn valve seats lead to bills over $10,000. Roof panels beside the panoramic sunroof can also come loose. On the Ioniq 6, ICCU failure drops the car into a limp mode near 22 mph. The C-Class has crash-linked complaints in steering (13), electrical (12), and power train (10). The Ioniq 6 has just one crash-linked complaint, in electrical.

Hyundai Ioniq 6 vs Mercedes-Benz C-Class common problem areas comparison
Component	Hyundai Ioniq 6	Mercedes-Benz C-Class
ELECTRICAL SYSTEM	0.5Very Low	2.7Low
UNKNOWN OR OTHER	0.1Very Low	1.8Low
ENGINE	—None	1.9Low
POWER TRAIN	0.1Very Low	1.2Low
STEERING	—None	0.8Very Low
STRUCTURE	—None	0.7Very Low
SERVICE BRAKES	—None	0.5Very Low
AIR BAGS	—None	0.4Very Low
FORWARD COLLISION AVOIDANCE	—None	0.3Very Low
VEHICLE SPEED CONTROL	—None	0.3Very Low
TIRES	—None	0.2Very Low
FUEL SYSTEM	—None	0.2Very Low
WHEELS	—None	0.2Very Low
BACK OVER PREVENTION	—None	0.1Very Low
VISIBILITY	—None	0.1Very Low
SUSPENSION	—None	0.1Very Low
FUEL/PROPULSION SYSTEM	—None	—None
VISIBILITY/WIPER	—None	—None
SEAT BELTS	—None	—None
SEATS	—None	—None

Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.

How Does Hyundai Ioniq 6 vs Mercedes-Benz C-Class Reliability Compare by Year?

Hyundai Ioniq 6 vs Mercedes-Benz C-Class year-by-year reliability scores
Year	Hyundai Ioniq 6	Mercedes-Benz C-Class	Edge
2026	82/1000R / 0C	82/1000R / 0C	Tie
2024	77/1005R / 33C	69/1007R / 20C	Hyundai Ioniq 6
2023	69/1005R / 54C	53/10083R / 209C	Hyundai Ioniq 6

Best years to cross-shop: The 2024 Hyundai Ioniq 6 scored 77/100 and the 2024 Mercedes-Benz C-Class scored 69/100 — the strongest shared model years that have been on the road for at least two years, where available.

Who Should Buy the Hyundai Ioniq 6 vs the Mercedes-Benz C-Class?

Pick the Ioniq 6 if you want the lower-risk used car. Complaints and recalls are a small fraction of the C-Class totals, and its main fault is a single part, the ICCU. Be careful with 2023 and 2024, the weakest years, and check that any ICCU warning has been fixed. Ask how long parts took, since owners report waits of weeks. The 2025 and 2026 cars have had less time to collect complaints, so their clean records prove less than they seem to. Pick the C-Class only if you prefer the Mercedes and accept the risk, and buy with a warranty in hand. Skip 2020 and 2021, the weakest years. Out of warranty, engine head repairs of $7,200 to over $10,000 and a $10,484 sunroof glass quote were reported. Before buying, ask whether roof panel and sunroof work was done, and have the 48-volt and 12-volt battery systems checked. Test drive at highway speed to feel for steering shake.

Hyundai Ioniq 6 vs Mercedes-Benz C-Class: Common Questions

Is the Mercedes-Benz C-Class more reliable than the Hyundai Ioniq 6?: No. The Ioniq 6 comes out well ahead, by a large gap. It drew 0.9 complaints per 10,000 sold, against 18.3 for the C-Class. The C-Class also has problems in five major areas, while the Ioniq 6 is mostly hit by one fault, ICCU failure.
Which has more recalls, the C-Class or the Ioniq 6?: The C-Class, by a wide margin. Federal recall records show 767 recalls across its 8 model years, while the Ioniq 6 has 13 across 4 model years. The Ioniq 6 is newer and has fewer model years, but the C-Class total is still far higher.
What is the biggest problem with the Hyundai Ioniq 6?: ICCU failure. Owners describe a power supply warning, then limp mode near 22 mph, and sometimes a shutdown in traffic or on the highway. The 12-volt battery often dies too, so the car needs a tow. Some failures came back after a replacement, and parts can take weeks.
What goes wrong with the Mercedes-Benz C-Class?: Electrical faults lead, with 323 complaints. Owners report a 48-volt battery warning, sudden loss of drive power, a draining 12-volt battery, and blank center screens. Engine misfires, steering wheel shake at 45 to 65 mph, and loose roof panels near the panoramic sunroof also appear.
Which model years of the C-Class and Ioniq 6 should I avoid?: Avoid the 2020 and 2021 C-Class, its weakest years. For the Ioniq 6, 2023 and 2024 are the weakest. Newer years of both have fewer complaints partly because they have had less time on the road, so a short record is not proof of a better car.

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Decided between Hyundai Ioniq 6 and Mercedes-Benz C-Class? Run a VIN check before you buy — uncover hidden accidents, title issues, and open recalls.

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How we score the Hyundai Ioniq 6 and Mercedes-Benz C-Class

Scores weight complaint severity at 35%, repair costs at 30%, recall impact at 20%, and the spread of complaints across systems at 15%, with complaint counts adjusted for US sales. Read the full methodology.

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