2012 Hyundai Sonata: Engine failure
Common wear/failure (not a recall)
Symptoms
Owners of the 2012 Sonata report: engine failure. CarComplaints.com lists 21 owner complaints, average mileage 97,300 miles.
NHTSA has 577 owner complaints for the 2012 Sonata in this area. Examples:
- NHTSA complaint ODI #11754020 (filed 07/31/2026): “The contact owns a 2012 hyundai sonata. the contact stated that while driving at 30 mph, the check engine warning light illuminated, the engine started knocking, and smoke emitted from under the hood. the contact decelerated to approximately 15 mph and drove t…”
- NHTSA complaint ODI #11753672 (filed 07/30/2026): “Vehicle engine caught fire in april 2026! tow company sold for parts without my permission! immediately after gaining possession of my car. i didn't have comprehensive insurance, only basic. i had a brain bleed stroke nov. 2022 and this is causing stress, setb…”
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: replace engine (10 reports) new engine (1 reports). 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
CarComplaints.com owners report a typical repair cost of about $960 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .