Solving P0455 on Your 2019 Hyundai Tucson
A P0455 on your 2019 Tucson means the ECM detected a large EVAP leak. Your 3rd-generation Tucson with the 2.0L or 2.4L engine may still be within Hyundai's 5-year warranty. The gas cap is the top suspect.
Symptoms
- Check engine light with P0455
- Faint fuel odor
- Gas cap seal worn after 6+ years
- Failed emissions test
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Worn seal. Replace for $10–$25.
- Canister Close Valve (Medium Likelihood): Hyundai's vent valve sticking. $150–$220 if out of warranty.
- Purge Control Solenoid (Medium Likelihood): Stuck open. $100–$180.
- Vapor Line (Low Likelihood): Cracked hose. $80–$200.
- Charcoal Canister (Low Likelihood): Saturated. $200–$350.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 returns, check warranty status—Hyundai's 5yr/60k may still apply through 2024. The emissions warranty covers this through 2027.
Warranty Coverage
Hyundai's 5-year/60,000-mile warranty expired in 2024. The federal emissions warranty (8yr/80k) covers EVAP through 2027.
Safe to Drive?
Yes. P0455 doesn't affect the Tucson's engine, 6-speed automatic, or AWD.