2021 Hyundai Sonata Hybrid: True Cost, Problems & Verdict
53 NHTSA owner complaints · 0 recalls · data-computed verdict. No opinions — public data only.
Editor's note
No Sonata Hybrid year is an AVOID: eleven of the thirteen scored years are BUY verdicts, the 2018 and 2019 cars score 94, and the 2012 and 2016 cars are CAUTION at 59 and 62. The whole record holds 741 complaints against 11,270 for the petrol Sonata, and the hybrid beats the petrol car's score in every shared year from 2011 to 2017. Read the full note on the model page. 2021 specifically: a year the record favours — 53 complaints, score 79/100. The caveats in the note apply to other years of this nameplate more than to this one.
Read the guide
Hybrid or petrol? The same nameplate, both records, side by side, including 2021 — written and signed by Adir Trabelsi, 2026-09-16.
Owner complaints: 53 filed with NHTSA
Complaints per year on the road: 10.6
What owners say
Verbatim reports filed with the United States safety regulator (NHTSA) by owners of this exact model year. Public record.
The vehicle’s 12-volt electrical system repeatedly loses power within about 1 hour of sitting. The car becomes completely unresponsive (cannot unlock or start) and requires use of the built-in 12V battery reset button to restore power. This occurs frequently and makes the vehicle unreliable and potentially unsafe, as the car may become inoperable without warning. This appears to be an electrical system defect or p…
Owned car since 09/2024 with 64K miles. Battery system (12V/hybrid system) has shut down and died 47 times since 04/2025 - no shut downs before then. Car with ~69K miles at that time. Dealer had car six weeks (05/17 to 07/05/2025) and it died “a number” of times and report that Hyundai claims this is “what the car is supposed to do.” Since 07/05 it has died 12 times just sitting in my driveway or the lot at work. …
Every day the car is dead, have to take the manual key out pop door cover off unlock car manually push the 12v reset button and hold fob to start/stop button for car to work again. Happens daily.
Recalls: 0 campaigns
| Campaign | Component | Summary |
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What it costs to buy — and what owning it really takes
Class-level estimates, priced as a mid-size car of its model year, re-priced to your country. Not a quote, not a valuation of one specific car — condition, mileage and options move it. How these are computed.
What it costs to run
EPA combined 47 MPG · estimated annual fuel cost $1,350
Re-priced automatically from your country's retail fuel, electricity and parts indices — change country in the bar at the top. Estimates; see methodology.
What this car's problems cost to fix
Ranked by the components owners of this exact model year actually complain about. Each figure is flat-rate labour hours x the local shop rate plus a parts band — an estimate of what this kind of failure costs, not a quote, and not a prediction that this car will need it. Formula.
- Electrical System25 complaints · typical job: Alternator, battery-drain or body-module diagnosis and replacement (3.0 h labour + parts)$540–$1,310
- Engine21 complaints · typical job: Cooling-system or timing-drive repair (6.0 h labour + parts)$1,040–$2,220
- Unknown Or Other7 complaints · typical job: Diagnosis and mixed repair (2.0 h labour + parts)$360–$940
- Engine And Engine Cooling3 complaints · typical job: Water pump, thermostat and coolant service (3.5 h labour + parts)$600–$1,040
- Forward Collision Avoidance3 complaints · typical job: Radar or camera module replacement and calibration (3.0 h labour + parts)$780–$2,160
- Power Train3 complaints · typical job: Transmission service or clutch-pack repair (7.0 h labour + parts)$1,290–$4,040
Other Hyundai Sonata Hybrid years
Hyundai Sonata Hybrid years to avoid, and the best years to buy →
FAQ
What is the most common problem with the 2021 Hyundai Sonata Hybrid?
The most-reported issue in NHTSA complaint data is Electrical System (25 complaints in our indexed sample).
Is the 2021 Hyundai Sonata Hybrid a good used car to buy?
Our data verdict is BUY with a reliability score of 79/100, computed from 53 NHTSA complaints and 0 recall campaigns. See the verdict card for the top reasons.
How much does it cost to fix the 2021 Hyundai Sonata Hybrid's most common problem?
25 of the NHTSA complaints filed against the 2021 Hyundai Sonata Hybrid sit in the Electrical System group — more than any other component on this model year. The representative job there is alternator, battery-drain or body-module diagnosis and replacement: about 3.0 hours of labour plus parts, roughly $540–$1,310 at a US independent shop and re-priced to your country at the top of the page. It is an estimate of what this class of failure costs, not a quote for this car.
What does a 2021 Hyundai Sonata Hybrid cost to run per year?
About $2,921 a year in fuel or energy plus the maintenance band — roughly $14,605 over five years, before purchase price, insurance and depreciation. Figures come from available EPA fuel-economy data and industry maintenance averages, and are re-priced to your country.
Compare with
Other midsizes of about the same age.
What will a 2021 Hyundai Sonata Hybrid really cost YOU per year?
Fuel, maintenance band and depreciation — computed from public data in 10 seconds.
Open the true-cost calculatorData sources
Complaints & recalls: NHTSA ·
Fuel economy: EPA fueleconomy.gov ·
Scoring: our published methodology.
Maintenance bands are industry-average estimates (AAA Your Driving Costs, CarMD index) — labeled estimates, not measurements.
Last updated: 2026-10-04.
Moderate evidence — 53 complaints, 0 recalls on record
- 53 NHTSA complaints on record (10.6/yr of exposure) — worse than a typical year of this model (7.3/yr)
- 0 recall campaigns, 0 touching safety-critical systems