2021 Hyundai Sonata Engine cooling Problems
- Complaints
- 1about this part
- Share
- 1%of 135 total for the year
- Median mileage
- 87,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the engine cooling of the 2021 Hyundai Sonata, 1% of the 135 complaints for this model year. Where a mileage was given, the median is 87,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The contact owns a 2021 Hyundai Sonata. The contact stated while driving 15 MPH, the contact noticed that the passenger’s side rear seat level had become elevated. The contact stated that his daughter who was seated in the child seat head had started touching the top of the sunroof. The contact became aware of a gasoline odor coming from the engine. The contact also became aware that the vehicle was consuming an abnormal amount of gasoline. There was no warning light illuminated. The vehicle was taken to the dealer however, the diagnostic test result was undisclosed. …”
NHTSA complaint #11590388, filed 2024-05, 87,000 milesRelated service bulletins
- 10251294Feb 29, 2024This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve…
- 10247189Oct 13, 2023This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
- 10243340Sep 18, 2023This bulletin is issued to provide the extended battery diagnosis procedure using GDS-M. This battery diagnosis function displays the various battery-related faults such as: ⢅
- 10241875Aug 21, 2023This bulletin provides warranty procedure for EGR Valve replacement related to DTC P0401 EGR Flow Insufficient on 2020 and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles.
- 10240089Jul 18, 2023If you are servicing an 8-speed DCT front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition.
- 10238377Jun 9, 2023This bulletin provides the diagnostic procedure for the GDI injector(s) in certain 21-23MY Sonata, 21-22MY Santa Fe, certain 22MY Santa Cruz, and certain 21-23MY Tucson equipped…
- 10235344Apr 7, 2023This bulletin provides the procedure to repair poor pin tension at joint connector JE102 in certain Sonata (1.6 T-GDI engine) with one or more DTC.
- 10235343Apr 7, 2023This bulletin provides the procedure to repair poor pin tension at joint connector JE202 in certain Sonata (2.5L GDI engine) with one or more DTC.
- 10235340Apr 6, 2023If you are servicing an 8-speed vehicle with a âCheck Engineâ light on and one or more of the DTC listed, follow the service procedure and replace the related solenoid and…
- 10233552Mar 23, 2023This bulletin provides the diagnostic procedure for the GDI injector(s) in certain 21-23MY Sonata, 21-22MY Santa Fe, certain 22MY Santa Cruz, and certain MY21-23 Tucson equipped…
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2023 | 2 | 2% |
| 2021 | 1 | 1% |
| 2019 | 8 | 5% |
| 2018 | 14 | 4% |
| 2017 | 19 | 2% |
| 2016 | 17 | 2% |
| 2015 | 21 | 2% |
| 2014 | 21 | 3% |
| 2013 | 40 | 2% |
| 2012 | 11 | 1% |
| 2011 | 45 | 1% |
| 2009 | 6 | 1% |
| 2008 | 2 | 0% |
| 2007 | 8 | 1% |
| 2006 | 30 | 3% |
| 2005 | 5 | 3% |
| 2004 | 5 | 2% |
| 2003 | 14 | 7% |
| 2002 | 16 | 5% |
| 2001 | 23 | 11% |
| 2000 | 31 | 11% |
| 1999 | 23 | 19% |
| 1998 | 4 | 8% |
| 1997 | 7 | 14% |
| 1996 | 6 | 26% |
| 1995 | 9 | 14% |
| 1993 | 9 | 35% |
| 1992 | 4 | 18% |
| 1991 | 6 | 21% |
| 1989 | 5 | 45% |
Other parts of the 2021 Hyundai Sonata
34 complaintsFuel system
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 complaints
← All problems reported for the 2021 Hyundai Sonata
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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