2022 Hyundai Elantra: Stalled, check engine light on (HEV MCU code)
Common wear/failure (not a recall)
Symptoms
Owners of the 2022 Elantra report: stalled, check engine light on (HEV MCU code). CarComplaints.com lists 1 owner complaints, average mileage 3,450 miles.
NHTSA has 21 owner complaints for the 2022 Elantra in this area. Examples:
- NHTSA complaint ODI #11757824 (filed 08/18/2026): “Horn not functioning. engine mount needs replacement.…”
- NHTSA complaint ODI #11735854 (filed 05/05/2026): “Description of incident: the vehicle is experiencing significant engine oil dilution by gasoline. upon inspection of the dipstick, the oil level is consistently found to be well above the "full" mark, and the oil emits a strong, pungent odor of raw fuel. this …”
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: Stalled, check engine light on (HEV MCU code) (2022 Elantra)
- NHTSA complaints API, 2022 Elantra
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