2020 Hyundai Sonata: Burning coolant smell from engine compartment
Common wear/failure (not a recall)
Symptoms
Owners of the 2020 Sonata report: burning coolant smell from engine compartment. CarComplaints.com lists 1 owner complaints, average mileage 50 miles.
NHTSA has 32 owner complaints for the 2020 Sonata in this area. Examples:
- NHTSA complaint ODI #11771519 (filed 10/15/2026): “Vehicle experienced intermittent, severe powertrain defect resulting in a critical safety hazard. between 30k and 36k miles, the vehicle underwent 3 violent highway deceleration episodes. during these events, the engine began shaking, escalating to violent s…”
- NHTSA complaint ODI #11761990 (filed 09/03/2026): “The a/c evaporator core and the core seal needs replacing on 2020 hyundai sonata. car is 6 years old. i already have a confirmed diagnosis with a ppm refrigerant leak tester at the condensate drain line the diagnosis is 100% confirmed. the evaporator is leakin…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: none clearly reported. Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
- CarComplaints.com: Burning coolant smell from engine compartment (2020 Sonata)
- NHTSA complaints API, 2020 Sonata
Page last updated .