Why is my Hyundai Elantras check engine light on with an EVAP system code?

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Why is my Hyundai Elantras check engine light on with an EVAP system code?

A common emission issue in Hyundai Elantras is the Check Engine Light CEL coming on due to an EVAP Evaporative Emissions Control system leak, often showing codes like P0441, P0455, o r P0456. These codes can be triggered by a loose o r faulty gas cap, leaking hoses, o r a failing purge o r vent valve. How can you identify the source of the leak, and is this issue covered under Hyundai’s emissions warranty?

Gari Specialist asked on 21 Jun 2025 18:03:25 pm

1 Answer

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Gari Master - on 21 Jun 2025 18:07:31 pm

The EVAP system prevents fuel vapors from escaping into the atmosphere by capturing and storing them in a charcoal canister. Common codes like P0441 incorrect purge flow, P0455 large leak, o r P0456 small leak usually indicate a leak o r malfunction.
Most frequent causes:

Loose o r faulty gas cap most common and easy to fix

Cracked EVAP hoses

Defective purge o r vent valve

Leaking charcoal canister
Solution:
Start by checking and tightening the gas cap. If the issue persists, a mechanic can perform a smoke test to identify leaks. EVAP components are often covered under Hyundai’s federal emissions warranty for up to 8 years/80,000 miles, depending on region.