P0455 on Your 2023 GMC Yukon
A P0455 on your 2023 Yukon means a large EVAP leak. Whether you have the 5.3L V8, 6.2L V8, or 3.0L Duramax diesel, gas-powered variants share the same EVAP system. Check for P0449 companion code. Gas cap first.
Symptoms
- Check engine light with P0455
- P0449 may also appear
- Possible fuel smell
- Gas cap not seating
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or defective. Warranty-covered.
- Vent Valve Solenoid (Medium Likelihood): GM's known EVAP weak point. Warranty-covered.
- Purge Solenoid (Medium Likelihood): Stuck open. Warranty-covered.
- Vapor Line (Low Likelihood): Connection issue. Warranty-covered.
- ECM Software (Low Likelihood): Calibration update. Warranty-covered.
Warranty
Your 2023 Yukon is under GM's 3-year/36,000-mile warranty through 2026. Federal emissions (8yr/80k) covers EVAP through 2031.
Safe to Drive?
Yes. P0455 doesn't affect V8 performance, 4WD, Magnetic Ride, towing, or any features.