2018 Hyundai Sonata: True Cost, Problems & Verdict
372 NHTSA owner complaints · 1 recalls · data-computed verdict. No opinions — public data only.
Editor's note
The sixth-generation Sonata (2011–2014) is the car that brought Hyundai's Theta II engine problem into the open. Connecting-rod bearing failure in the 2.0 and 2.4-litre engines leads to knocking, stalling and, in the worst cases, fire; Hyundai recalled 2011–2014 Sonatas in 2015 and 2017, extended the engine warranty, installed a knock-sensor detection system, and in 2020 paid a civil penalty to the federal regulator over the timing of the recalls. Read the full note on the model page. 2018 specifically: a year the record favours — 372 complaints, score 82/100. The caveats in the note apply to other years of this nameplate more than to this one.
Read the guide
The first-year rule: why the launch year of a new generation is the one to avoid, including 2018 — written and signed by Adir Trabelsi, 2026-09-01.
Owner complaints: 372 filed with NHTSA
Complaints per year on the road: 46.5
What owners say
Verbatim reports filed with the United States safety regulator (NHTSA) by owners of this exact model year. Public record.
Vehicle has been making a clunking noise (front passenger area). Brought to independent service center where they determined that the strut tower is failing. Current mileage 66000. Appt set for Checkered Flag Hyundai to evaluate on 9/11/2026.
My car stalls while driving and then I try to restart it but nothing happens. After reading online about the fuel pump issues and extended warranty related to the fuel pump I took the car in for repair. My car has 75,000 miles and the extended repair on this is for 150,000 miles/15 years. The dealer is refusing the repair because my car has a branded/ theft title. The car wasn't damaged just stolen. This is crea…
Since I had Service Campaign 9C2 completed, the car hesitates to start, does a mini-lurch upon cold start and runs rough. Two weeks ago, it was put in park, lurched backwards, then died. The starter and battery have been replaced but this has not helped. The car ran fine before this update was done.
Recalls: 1 campaigns
| Campaign | Component | Summary |
|---|---|---|
| 21V619000 | Latches/Locks/Linkages:Trunk Lid:Latch | Hyundai Motor America (Hyundai) is recalling certain 2017-2018 Sonata, 2016-2018 Sonata Hybrid, 2018-2020 Accent, and 2016-2017 Azera vehicles. The trunk latch may become damaged, preventing the opening of the trunk from the inside. |
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 31 MPG · estimated annual fuel cost $2,000
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.
- Engine210 complaints · typical job: Cooling-system or timing-drive repair (6.0 h labour + parts)$1,040–$2,220
- Electrical System60 complaints · typical job: Alternator, battery-drain or body-module diagnosis and replacement (3.0 h labour + parts)$540–$1,310
- Unknown Or Other58 complaints · typical job: Diagnosis and mixed repair (2.0 h labour + parts)$360–$940
- Power Train40 complaints · typical job: Transmission service or clutch-pack repair (7.0 h labour + parts)$1,290–$4,040
- Fuel/Propulsion System31 complaints · typical job: Fuel pump or injector replacement (3.5 h labour + parts)$680–$1,620
- Exterior Lighting22 complaints · typical job: Headlamp assembly or lighting-module replacement (1.5 h labour + parts)$360–$1,380
Other Hyundai Sonata years
FAQ
What is the most common problem with the 2018 Hyundai Sonata?
The most-reported issue in NHTSA complaint data is Engine (210 complaints in our indexed sample).
Is the 2018 Hyundai Sonata a good used car to buy?
Our data verdict is BUY with a reliability score of 82/100, computed from 372 NHTSA complaints and 1 recall campaigns. See the verdict card for the top reasons.
How much does it cost to fix the 2018 Hyundai Sonata's most common problem?
210 of the NHTSA complaints filed against the 2018 Hyundai Sonata sit in the Engine group — more than any other component on this model year. The representative job there is cooling-system or timing-drive repair: about 6.0 hours of labour plus parts, roughly $1,040–$2,220 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 2018 Hyundai Sonata cost to run per year?
About $4,673 a year in fuel or energy plus the maintenance band — roughly $23,368 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.
Does the 2018 Hyundai Sonata have recalls?
Yes — NHTSA lists 1 recall campaign(s) for the 2018 Hyundai Sonata, 0 of them touching fire, crash or stall risk, the most recent recorded 06/08/2021. Check this car's VIN at nhtsa.gov/recalls before you buy.
Compare with
Other midsizes of about the same age.
What will a 2018 Hyundai Sonata 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.
Strong evidence — 372 complaints, 1 recalls on record
- 372 NHTSA complaints on record (46.5/yr of exposure) — in line with a typical year of this model (46.5/yr)
- 1 recall campaigns, 0 touching safety-critical systems