Investigating P0440 on Your 2024 Hyundai Sonata
When your 2024 Hyundai Sonata triggers P0440, the evidence points to the EVAP system. The eighth-generation Sonata (DN8 platform) with its 2.5L Smartstream engine (191 hp) or available 1.6L turbo features a refined EVAP system. As a newer vehicle under warranty, the fix should be straightforward and free.
Symptoms
- Check engine light on
- Faint fuel odor
- Slight fuel economy decrease
- Fueling difficulties
- Emissions test failure
Your Sonata drives normally. The engine, 8-speed DCT, and all features are unaffected.
Likely Causes
- Gas Cap — Most common trigger. Estimated repair: $0–$25 (warranty).
- Purge Control Solenoid Valve — Smartstream engine PCSV. Estimated repair: $0–$195 (warranty).
- Canister Close Valve — EVAP vent control. Estimated repair: $0–$215 (warranty).
- Assembly or Routing Issue — Possible on newer vehicles. Estimated repair: $0 (warranty).
- Software Update — PCM calibration refinement. Estimated repair: $0 (warranty).
Diagnosis
- Check gas cap
- Visit dealer for warranty diagnosis
- Dealer checks TSBs, scans, tests components
Cost
$0 under warranty. Hyundai's 5-year/60,000-mile warranty covers everything.
Can I Drive With P0440?
Yes. Completely safe. No performance impact.
Go to the Dealer
Free warranty repair. The dealer can also check for any applicable TSBs or software updates.