2018 Hyundai Sonata Fuel/propulsion System Problems

NHTSA component category: FUEL/PROPULSION SYSTEM · data through 07/12/2026

30Fuel/propulsion System complaints

8.2%Of all 364 complaints

#5Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How fuel/propulsion system ranks on this vehicle

ENGINE205 · 56.3%

Unspecified / other58 · 15.9%

ELECTRICAL SYSTEM56 · 15.4%

POWER TRAIN39 · 10.7%

FUEL/PROPULSION SYSTEM30 · 8.2%

Share of the 364 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 Hyundai Sonata overview page.

What owners report

“IN FEB 2020 MY SONATA WENT INTO SAFE MODE AFTER EXITING HIGHWAY AND DEALER ENDED UP REPLACING "KNOCK SENSOR". IN DECEMBER 2020 MY ENGINE "STUTTERED"…”NHTSA complaint 11378237 — filed 12/07/2020

“MY 2018 SONATA WILL NOT START WHEN TEMP DROPS BELOW 20 DEG F. IT HAS HAPPENED 3 TIMES THIS WINTER AND WHEN IT WARMS BACK…”NHTSA complaint 11290767 — filed 12/22/2019

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Fuel/propulsion System complaints by year filed

Frequently asked questions

Does the 2018 Hyundai Sonata have fuel/propulsion system problems?

Fuel/propulsion System is the #5 most-reported problem area on the 2018 Hyundai Sonata: 30 of 364 complaints on file (8.2%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2018 Hyundai Sonata have in total?

364 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 18 involved a crash, 13 involved a fire, 20 reported injuries, and 1 reported deaths.

What does NHTSA's fuel/propulsion system category include?

NHTSA assigns each complaint to standard component categories; this page reports the FUEL/PROPULSION SYSTEM category exactly as NHTSA defines and records it.

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 07/12/2026.