Research · Midsize Cars
2021 Hyundai IoniqRecalls, problems, MPG & safety
NHTSA lists 0 safety recalls and 2 owner complaints for the 2021 Hyundai Ioniq. Most complaints involve electrical system (2) and fuel/propulsion system (1). The EPA rates it 55–133 mpg combined.
Combined MPG
55–133mpg
EPA · 3 versions
NHTSA overall
—
Not rated by NCAP
Safety recalls
0campaigns
NHTSA
Owner complaints
2
Top: electrical system
Fuel cost / yr
$550est.
EPA estimate, best version
Safety recalls
NHTSA campaigns for this model year
0 recalls found in NHTSA data for the 2021 Hyundai Ioniq as of Nov 9, 2026.
Data from NHTSA Recalls API · synced Nov 9, 2026NHTSA vehicle page
Owner complaints by component
2 complaints filed with NHTSA · Jun 2023 – Jul 2026
- Electrical system2
- Fuel/propulsion system1
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 9, 2026NHTSA vehicle page
What owners report most
Verbatim excerpts from NHTSA complaints, by component
Electrical system
2 reports
“VEHICLE SAFETY HAZARD: ACTIVE HIGH-VOLTAGE ISOLATION FAULT (DTC P0AA6) WITH DECEPTIVE DEALER/MANUFACTURER BYPASS & CONCEALMENT. On April 15, 2026, the dealer scanned my 2021 Ioniq EV and uncovered DTC P0AA6 (Hybrid/EV Battery Voltage System Isolation Fault), which denotes a catastrophic high-voltage leak into the chassis. This is a severe safety hazard posing immediate risks of fatal electrocution to occupants, EV battery thermal runaway (fire), or sudden total loss of propulsion at highway speeds. Instead of grounding this dangerous vehicle, the dealership concealed the diagnostic code, withheld the physical invoice, and released the vehicle back to me on April 28, falsely claiming it was "fixed to 100%." They forced me to drive an actively compromised high-voltage system. On May 7, the defect immediately returned while driving. I confronted the dealer on May 8 for merely resetting the car's computer to bypass the safety warning, which is an extremely dangerous fire hazard. The manufacturer has refused to replace the defective EV battery under warranty, or provide alternative transportation. This vehicle has now been grounded and decaying in an open lot for…”
Fuel/propulsion system
1 report
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 9, 2026
Engines, transmissions & drive
3 versions rated by the EPA
- EPA class
- Midsize Cars, Large Cars
- Engines
- Electric motor · 1.6L 4-cyl hybrid
- Transmissions
- Automatic (A1) · Automatic (AM-S6)
- Drive
- Front-Wheel Drive
- Fuel
- Electricity · Regular Gasoline
- EV range
- 170 mi (EPA)
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
Data from EPA fueleconomy.gov · synced Nov 9, 2026EPA listing
EPA fuel economy by version
City / highway / combined, annual fuel cost and CO₂
EPA
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| Ioniq Electric Auto (A1) · Front-Wheel Drive | 145 | 121 | 133 | $550 | — |
| Ioniq Blue Auto (AM-S6), 4 cyl, 1.6 L · Front-Wheel Drive | 58 | 60 | 59 | $1,050 | 151 |
| Ioniq Auto (AM-S6), 4 cyl, 1.6 L · Front-Wheel Drive | 54 | 56 | 55 | $1,150 | 162 |
- 133mpg comb.
- 59mpg comb.
- 55mpg comb.
Data from EPA fueleconomy.gov · synced Nov 9, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
NHTSA 5-Star Safety Ratings
1 tested variant
NHTSA has not published 5-Star Safety Ratings for the 2021 Hyundai Ioniq as of Nov 9, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Nov 9, 2026Vehicle 15702
Maintenance basics
General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
- Engine oil & filter5,000–10,000 mi
6–12 months - Tire rotation5,000–7,500 mi
Every oil change - Engine air filter15,000–30,000 mi
1–2 years - Cabin air filter15,000–25,000 mi
1–2 years - Brake fluid—
2–3 years - Coolant60,000–100,000 mi
5–10 years - Spark plugs60,000–100,000 mi
— - 12V battery—
3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
2021 Ioniq questions
How many recalls does the 2021 Hyundai Ioniq have?
0 recalls found in NHTSA data as of Nov 9, 2026.
What are the most common 2021 Hyundai Ioniq problems?
Owners filed 2 complaints with NHTSA. The most-cited components are electrical system (2), fuel/propulsion system (1). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
What MPG does the 2021 Hyundai Ioniq get?
The EPA rates the 2021 Hyundai Ioniq at 55–133 mpg combined, depending on engine and drivetrain (3 versions rated).
Data from NHTSA & EPA · synced Nov 9, 2026