Investigating P0455 on Your 2024 GMC Yukon
A P0455 on your 2024 Yukon means a large EVAP leak. Your full-size SUV is fully under warranty. Gas cap first, and check for P0449 companion code.
Symptoms
- Check engine light with P0455
- May see P0449
- Possible fuel smell
- Gas cap not seating
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Loose or factory defect. Warranty-covered.
- Vent Valve Solenoid (Medium Likelihood): GM vent valve. Warranty-covered.
- Purge Solenoid (Medium Likelihood): Factory defect. Warranty-covered.
- Vapor Line (Low Likelihood): Assembly issue. Warranty-covered.
- ECM Software (Low Likelihood): Update needed. Warranty-covered.
Warranty
Your 2024 Yukon is covered by GM's 3-year/36,000-mile warranty through 2027. Federal emissions (8yr/80k) extends through 2032.
Safe to Drive?
Yes. P0455 doesn't affect the engine, 4WD, towing, or features.