2021 Hyundai Sonata: Reliability, Recalls, Known Issues & Cost to Own
Data last updated 2026-07-04 · sources listed throughout · based on public NHTSA data
Modern, tech-rich and efficient 8th-generation Sonata, though this year rates slightly below average for reliability and falls under the fuel-tank check-valve recall. Confirm the recall and check for HVAC blower-fuse and oil-consumption complaints. 4 known issue patterns are documented below, with frequency and the mileage windows where they typically appear. New, the 2021 Hyundai Sonata ranged from $23,950 to $33,950 depending on trim (base MSRP, before options and destination).
This listing
Context from the listing you were viewing, not a market-price judgement.
Modern, tech-rich and efficient 8th-generation Sonata, though this year rates slightly below average for reliability and falls under the fuel-tank check-valve recall. Confirm the recall and check for HVAC blower-fuse and oil-consumption complaints.
Sources (1)
- api.nhtsa.govhttps://api.nhtsa.gov/complaints/complaintsByVehicle?make=hyundai&model=sonat…
Known issues
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Fuel-tank check-valve defect allowing the tank to pressurize and expand toward hot exhaust components (fire risk)
occasional · 45 NHTSA complaints · typically 40k–130k miles · fuel
-
HVAC blower-motor and fuse-box overheating, with the blower fuse repeatedly burning out
occasional · 20 NHTSA complaints · typically 27k–120k miles · hvac
-
Excessive oil consumption, check-engine lights and sudden loss of power
occasional · 18 NHTSA complaints · typically 47k–130k miles · engine
-
Transmission faults including abrupt highway deceleration and low-speed jolting on the 1.6T dual-clutch
isolated · 8 NHTSA complaints · transmission
Based on public NHTSA complaint data and AI synthesis: patterns, not guarantees.
Sources (1)
- api.nhtsa.govhttps://api.nhtsa.gov/complaints/complaintsByVehicle?make=hyundai&model=sonat…
Recalls & safety
Recall history hasn't been loaded for this model year yet.
Whether a recall is still open on a specific car depends on its VIN. Check it free at NHTSA's VIN lookup (nhtsa.gov/recalls), or ask the seller for proof the repair was done.
Pros & cons
Pros
- Spacious, tech-rich cabin
- Striking modern styling
- Excellent fuel economy
- Modern Smartstream engines free of the Theta II problems
- Strong value, warranty and safety ratings
Cons
- Fuel-tank check-valve recall on 2020-2023 cars
- Occasional HVAC blower-fuse and oil-consumption complaints
- Push-button shifter not to everyone's taste
- Resale value rated weakest by some owners
Trims & original pricing
| Trim | Original base MSRP | New today | Engine | MPG |
|---|---|---|---|---|
| SE | $23,950 | $27,450 | 2.5L 4-cyl (191 hp) | 31 |
| SEL | $25,800 | discontinued | 2.5L 4-cyl (191 hp) | 31 |
| SEL Plus | $28,300 | discontinued | 1.6L turbo 4-cyl (180 hp) | 30 |
| N Line | $33,300 | $36,050 | 2.5L turbo 4-cyl (290 hp) | 27 |
| Limited | $33,950 | discontinued | 1.6L turbo 4-cyl (180 hp) | 30 |
Prices are base MSRP for each trim's standard configuration. Options, packages, and destination charges added to what original buyers actually paid.
2021-2023 cars held unusually high used values due to pandemic-era supply shortages, so comparisons to original MSRP read differently for these years.
Sources (5)
- iseecars.comhttps://www.iseecars.com/car/2021-hyundai-sonata-price
- fueleconomy.govhttps://www.fueleconomy.gov/ws/rest/vehicle/42796
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Hyundai_Sonata
- fueleconomy.govhttps://www.fueleconomy.gov/ws/rest/vehicle/42790
- fueleconomy.govhttps://www.fueleconomy.gov/ws/rest/vehicle/43456
Depreciation
Move your cursor along the line to see the estimated value for any year.
This listing sits above the typical depreciation curve. Common for heavily-optioned cars and for 2021-2023 model years (pandemic-era pricing); the curve is anchored at base MSRP, which excludes options.
Curve anchored at the entry-trim base MSRP ($23,950). Higher trims started higher (up to $33,950), and options added more.
Curve outlook: a typical 2021 loses roughly another 38% of its value over the next 3 years. These are estimates from public data, not a market-price claim.
2021-2023 cars held unusually high used values due to pandemic-era supply shortages, so comparisons to original MSRP read differently for these years.
Sources (1)
- caredge.comhttps://caredge.com/hyundai/sonata/depreciation
Cost to own
| Routine maintenance | ≈ $600–650/yr |
| Insurance (medium tier) | ≈ $2,500–2,600/yr |
| Fuel (12k mi/yr, 30 MPG) | ≈ $1,280/yr |
National-average estimates based on public data. Your costs vary by region, driver, and condition.
Sources (1)
- caredge.comhttps://caredge.com/hyundai/sonata/maintenance
Frequently asked questions
What problems does the 2021 Hyundai Sonata have?
Documented issue patterns include: Fuel-tank check-valve defect allowing the tank to pressurize and expand toward hot exhaust components (fire risk); HVAC blower-motor and fuse-box overheating, with the blower fuse repeatedly burning out; Excessive oil consumption, check-engine lights and sudden loss of power; Transmission faults including abrupt highway deceleration and low-speed jolting on the 1.6T dual-clutch. Frequency is based on public NHTSA complaint data: patterns, not guarantees.
Is the 2021 Hyundai Sonata reliable?
Modern, tech-rich and efficient 8th-generation Sonata, though this year rates slightly below average for reliability and falls under the fuel-tank check-valve recall. Confirm the recall and check for HVAC blower-fuse and oil-consumption complaints.
How much did the 2021 Hyundai Sonata cost new?
Between $23,950 and $33,950 depending on trim. Those are base MSRPs for each trim's standard configuration; options, packages, and destination charges added to what original buyers actually paid. 2021-2023 cars held unusually high used values due to pandemic-era supply shortages, so comparisons to original MSRP read differently for these years.
Is the Hyundai Sonata expensive to maintain?
Estimated routine maintenance runs about $600–650/year.
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Estimates are based on public data: patterns, not guarantees. CarVitals is not affiliated with NHTSA, CarMax, AutoTrader, or Cars.com. Issue frequencies come from public NHTSA complaint data, which has no denominator, so they describe reporting patterns, not failure probabilities. Always have a used car inspected before buying. How we build these reports.