Built from official NHTSA complaint and recall data · data through 07/14/2026
High complaint levelIts most-reported problem — Engine — runs 4.7× the fleet median for that category across the 2583 model-years tracked on this site.
364Complaints
1Recalls
18Crashes
13Fires
20Injured
1Deaths
Source: U.S. NHTSA complaint & recall data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
Is this problem acknowledged?
The most-reported problem — Engine (56.3% of complaints) — was examined in a now-closed NHTSA investigation that did not result in a recall.
Engine complaints here are 4.7× the median for that category across the 2583 model-years tracked on this site.
None of the 6 most-reported categories on this page have a recall or open investigation on file — they rest on unverified owner reports alone.
Complaint category
Reports
Official status
Reference
Engine
205 · 56.3%
Investigation closed
DP22003
Electrical System
56 · 15.4%
No official action
—
Power Train
39 · 10.7%
No official action
—
Fuel/propulsion System
30 · 8.2%
No official action
—
Exterior Lighting
21 · 5.8%
No official action
—
Vehicle Speed Control
17 · 4.7%
No official action
—
Recalled = an NHTSA safety recall covers this category, so a free repair exists. Under investigation = NHTSA has an open probe but no recall yet. Investigation closed = NHTSA examined it and closed the probe — this is not a defect finding; where a closed probe led to a recall we name the campaign. Not available = recall or investigation data could not be confirmed for this vehicle — it is not a “no”. Categories are matched by NHTSA's top-level component. Check your VIN at nhtsa.gov/recalls.
Percentages are the share of the 364 complaints citing each component; one complaint can cite several components. “Unspecified / other” is NHTSA’s own catch-all category — we show it rather than hide it.
A person inside the trunk compartment may become trapped, increasing their risk of injury. Recall repairs are free at authorized dealers.
PARK-IT: NO · PARK-OUTSIDE: NO · OVER-THE-AIR FIX: NO
Park itPark outside Specimen badges — shown on a recall card only when NHTSA sets the flag. None of the campaigns above carries either flag. Always check your own vehicle by VIN at nhtsa.gov/recalls.
What owners report
“The contact owns a 2018 Hyundai Sonata. The contact stated while driving 55 mph, the check engine warning light illuminated. The contact stated that the…”NHTSA complaint 11425614 — filed 07/20/2021 · ENGINE
“6/5/21 2018 Hyundai Sonata - less than 20K miles Turning left into parking lot at very low speed Car completely lost all power and brakes…”NHTSA complaint 11419752 — filed 06/05/2021 · ENGINE
“THE OIL CONSUMPTION IS OUT OF CONTROL FOR THEIR VEHICLES I'VE HAD MORE OIL CHANGES THAT I'VE EVER DONE ON A VEHICLE I'VE DONE OIL…”NHTSA complaint 11414402 — filed 04/29/2021 · ENGINE
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Complaint trend by year filed
Frequently asked questions
What are the most common problems with the 2018 Hyundai Sonata?
Engine issues are the most-reported category, cited in 205 of 364 NHTSA complaints (56.3%), followed by unspecified/other issues (58), electrical system (56), power train (39). Complaints are unverified owner reports.
How many complaints does the 2018 Hyundai Sonata have?
364 complaints were on file with NHTSA as of 07/14/2026. Of those, 18 involved a crash, 13 involved a fire, and 20 reported injuries. 1 deaths were reported.
Does the 2018 Hyundai Sonata have any recalls?
Yes — 1 NHTSA safety recall campaign, including campaign 21V619000. Recall repairs are free at authorized dealers. Check your specific vehicle by VIN at nhtsa.gov/recalls.
Has NHTSA acted on the 2018 Hyundai Sonata's reported problems?
0 of the 6 most-reported complaint categories on this page are backed by an NHTSA safety recall or open investigation; the rest are unverified owner reports. A recall means a free repair is available at authorized dealers.
Is a complaint proof of a defect?
No. Complaints are reports submitted by consumers to NHTSA. NHTSA does not verify individual complaints, and a complaint is not proof that a defect exists.
About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/14/2026.
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