2021 Hyundai Sonata Fuel system Problems
- Complaints
- 34about this part
- Share
- 25%of 135 total for the year
- Median mileage
- 75,242miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 34 complaints about the fuel system of the 2021 Hyundai Sonata, 25% of the 135 complaints for this model year. Where a mileage was given, the median is 75,242 miles. 1 of these say a crash was involved, according to the filers. 2 recall campaigns on record are filed under a similar system.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Engine revving at a complete stop. Surging engine while braking. I was forced to put into neutral when stopping. I had check engine prior that read P049D85. It went away. The Hyundai dealer said to be the EGR valve. Nick Hayes at D'Arcy Hyundai and Hyundai Motor America (HMA) agreeing to a 75% goodwill split of cost to repair.”
NHTSA complaint #11753130, filed 2026-07“I took my car to dealer to repair recall. Dealer told me if it failed they would keep car and report stolen if I tried to take it. They failed it. I didn't trust them based on their report it stolen statement. I had the police get my car back. I took it to another dealer where it passed recall easily. I believe they wanted my car for a customer, and tried to get away with this ruse.”
NHTSA complaint #11739443, filed 2026-05“On i believe 1/14/26, my check engine light came on. Scheduled appt.for 1/16/26 for diagnostic. Several things were wrong. I decided to come back due to not having the money at the time. Over the wked, I remembered a recall notice i received around November that I asked about in November during my oil change & was told the parts aren't in & they'd give me a call. Upon viewing the recall it seemed some things I was told on 1/16/26 could be a result of the recall. …”
NHTSA complaint #11719681, filed 2026-02“At approximately 130,000 miles, vehicle developed and internal coolant leak caused by a failed Exhaust Heat Recovery System (EHRS) in the center muffler assembly, matching TSB 23-EM-009H - a known manufacturing defect documented by Hyundai. Coolant has been slowly leaking internally into the exhaust system. The authorized Hyundai dealership initially failed to diagnose the internal leak and told me there was no leak and wanted to send me home. After pushing back, the internal leak was confirmed. …”
NHTSA complaint #11746137, filed 2026-06“I was driving my 2021 Hyundai Sonata at approximately 3:00 AM when the vehicle suddenly began shaking and vibrating. While stopped at a traffic light, the check engine light illuminated, and the engine was shaking severely. I immediately pulled over and shut off the engine. After waiting approximately one hour, I restarted the vehicle, but it was only able to drive very slowly. The following day, the vehicle was towed to a local repair shop. Diagnostic testing showed a cylinder 3 misfire, along with EVAP system errors and faulty fuel injector issues. …”
NHTSA complaint #11709821, filed 2026-01Related recalls
- 25V796000Nov 17, 2025Hyundai Motor America (Hyundai) is recalling certain 2020-2023 Sonata vehicles. A damaged check valve can allow air to enter the fuel tank, causing it to…Covers: Hyundai Sonata 2020–2023
- 21V524000Jul 9, 2021Hyundai Motor America (Hyundai) is recalling certain 2021-2022 Santa Fe and Sonata vehicles equipped with 2.5L turbocharged engines. Fuel may leak at the pipe…Covers: Hyundai Sonata 2021–2022, Santa FE 2021–2022
Related service bulletins
- 11027589Jan 7, 2026Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI fuel injectors leaking internally. This may be caused by…
- 11012819Jan 9, 2025Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI injectors leaking internally. This may be caused by…
- 11012362Jan 3, 2025Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU. Follow this bulletin to inspect the check valve, fuel pump cover and…
- 11012361Jan 3, 2025Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 (also known as DTC P14EE00) stored in the Electronic Control…
- 11010975Nov 14, 2024Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the Electronic Control Unit (ECU). The California…
- 11010974Nov 14, 2024Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU. Follow this bulletin to inspect the check valve, fuel pump cover and…
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 2 | 12% |
| 2024 | 1 | 2% |
| 2023 | 44 | 50% |
| 2022 | 29 | 31% |
| 2021 | 34 | 25% |
| 2020 | 59 | 32% |
| 2019 | 12 | 7% |
| 2018 | 34 | 9% |
| 2017 | 33 | 4% |
| 2016 | 34 | 5% |
| 2015 | 86 | 7% |
| 2014 | 89 | 12% |
| 2013 | 211 | 11% |
| 2012 | 114 | 7% |
| 2011 | 133 | 4% |
| 2010 | 12 | 3% |
| 2009 | 23 | 5% |
| 2008 | 6 | 1% |
| 2007 | 9 | 1% |
| 2006 | 22 | 2% |
| 2005 | 5 | 3% |
| 2004 | 8 | 4% |
| 2003 | 18 | 9% |
| 2002 | 25 | 8% |
| 2001 | 6 | 3% |
| 2000 | 4 | 1% |
| 1999 | 2 | 2% |
| 1998 | 10 | 20% |
| 1997 | 17 | 35% |
| 1995 | 2 | 3% |
| 1990 | 1 | 6% |
Other parts of the 2021 Hyundai Sonata
34 complaintsOther or unknown
32 complaintsTransmission and drivetrain
25 complaintsElectrical system
18 complaintsVisibility (wipers, defrost, mirrors)
12 complaintsForward collision avoidance
9 complaintsAir bags
4 complaintsBrakes
4 complaintsBody and structure
4 complaintsLane departure
3 complaintsSeat belts
2 complaintsSeats
2 complaints
← All problems reported for the 2021 Hyundai Sonata
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology