Last updated: 2026-10-10
Hyundai Ioniq 5 vs Toyota bZ4X: Reliability Compared
Hyundai Ioniq 5
Toyota bZ4X
Reliability favors the Toyota bZ4X by a wide margin over the Hyundai Ioniq 5, whose ICCU failures can cut power while driving. Ioniq 5 owners file far more complaints per vehicle sold. The bZ4X mostly has 12-volt battery trouble.
How Do the Hyundai Ioniq 5 and Toyota bZ4X Generations Compare?
Verdict
The Toyota bZ4X is more reliable than the Hyundai Ioniq 5, scoring 75/100 vs 54/100.
Reliability favors the Toyota bZ4X by a wide margin. The Ioniq 5 draws far more owner complaints per vehicle sold, and most trace to one failure: the ICCU, which sends the car into limp mode or kills power outright, sometimes at highway speed. Complaints on the bZ4X are far fewer, mostly a drained 12-volt battery. Federal recall records also show more recalls on the Ioniq 5, spread over more model years. The bZ4X is not trouble free, but the gap is large.
Key Differences
- 1Toyota bZ4X has 56.3 fewer complaints per 10k sold
- 2Toyota bZ4X scores 21 points higher in reliability
- 3Toyota bZ4X has 12 fewer total recalls
Category Scoreboard
Hyundai Ioniq 5 vs Toyota bZ4X: Which Is More Reliable?
| Metric | Hyundai Ioniq 5 | Toyota bZ4X |
|---|---|---|
| Reliability Score | 54/100 | 75/100 |
| Years Tracked | 5 | 3 |
| Total Recalls | 18 | 6 |
| Complaints per 10k Sold | 63.4 | 7.1 |
| Year Wins | 0 | 3 |
What Are the Common Problems With the Hyundai Ioniq 5 and Toyota bZ4X?
A failed ICCU defines the Hyundai's record. Owners report a pop, a "check electrical system" warning, then speed capped in turtle mode before the car stops. Failures return after recall work, and back-ordered parts stretch repairs to a week or more. Crash-linked reports appear in four areas: electrical, power train, forward collision avoidance, and speed control, which includes surging while parking. The Toyota's pattern is a dead 12-volt battery that comes back after replacement, plus underbody shields torn loose by standing water. Its data lists no crash-linked counts, though a few owners describe the car trying to shut off while driving.
| Component | Hyundai Ioniq 5 | Toyota bZ4X |
|---|---|---|
| ELECTRICAL SYSTEM | 36.8High | 1.9Low |
| POWER TRAIN | 12.1Above Avg | —None |
| UNKNOWN OR OTHER | 2.9Low | 0.7Very Low |
| FUEL/PROPULSION SYSTEM | 1.5Low | —None |
| FORWARD COLLISION AVOIDANCE | 1.4Low | —None |
| VEHICLE SPEED CONTROL | 1.3Low | —None |
| SERVICE BRAKES | 1.2Low | —None |
| STRUCTURE | —None | 1Very Low |
| EXTERIOR LIGHTING | 0.9Very Low | —None |
| LANE DEPARTURE | 0.7Very Low | —None |
| STEERING | 0.7Very Low | —None |
| TIRES | 0.4Very Low | 0.3Very Low |
| ENGINE | 0.3Very Low | —None |
| VISIBILITY/WIPER | 0.3Very Low | —None |
| SUSPENSION | —None | 0.3Very Low |
| PARKING BRAKE | 0.1Very Low | —None |
Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.
How Does Hyundai Ioniq 5 vs Toyota bZ4X Reliability Compare by Year?
| Year | Hyundai Ioniq 5 | Toyota bZ4X | Edge |
|---|---|---|---|
| 2025 | 53/1008R / 158C | 76/1002R / 5C | Toyota bZ4X |
| 2024 | 58/1002R / 134C | 75/1003R / 21C | Toyota bZ4X |
| 2023 | 50/1003R / 311C | 73/1001R / 15C | Toyota bZ4X |
Best years to cross-shop: The 2024 Hyundai Ioniq 5 scored 58/100 and the 2024 Toyota bZ4X scored 75/100 — the strongest shared model years that have been on the road for at least two years, where available.
Who Should Buy the Hyundai Ioniq 5 vs the Toyota bZ4X?
Hyundai Ioniq 5 vs Toyota bZ4X: Common Questions
- Is the Hyundai Ioniq 5 more reliable than the Toyota bZ4X?
- No. The bZ4X leads by a large gap. Ioniq 5 owners filed 63.4 complaints per 10,000 sold, against 7.1 for the bZ4X. The Ioniq 5's biggest issue is ICCU failure, which can cut drive power suddenly. The bZ4X's main issue is a dead 12-volt battery.
- Which has more recalls, the Ioniq 5 or the bZ4X?
- The Ioniq 5 has more. Federal recall records show 18 recalls across 5 model years for the Ioniq 5, and 6 across 3 model years for the bZ4X. Owners also report ICCU failures coming back after recall work on the Ioniq 5.
- What is the ICCU problem on the Ioniq 5?
- Owners describe a loud pop, then a "check electrical system" warning. The car drops into a power-limited mode and often stops, sometimes at highway speed. The 12V battery stops charging. Reports place failures around 22,000 to 25,000 miles, and replacement parts have been back ordered, so repairs can take a week or more.
- What goes wrong most often on the Toyota bZ4X?
- A dead 12-volt battery is the leading complaint. The car will not start or goes dark, and the key fob may stop working. Some owners replaced the battery twice and the drain returned. A smaller group reports underbody shields torn loose by standing water, which can damage the bumper.
- Does the bZ4X have any safety-related complaints?
- A few. Some owners describe the car trying to shut off while driving, with shaking, warning lights, and a stiff brake pedal. The data lists no crash-linked counts for the bZ4X, while the Ioniq 5 has crash-linked reports in four problem areas.
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Decided between Hyundai Ioniq 5 and Toyota bZ4X? Run a VIN check before you buy — uncover hidden accidents, title issues, and open recalls.
How we score the Hyundai Ioniq 5 and Toyota bZ4X
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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