Tracking P0455 on Your 2022 GMC Sierra
A P0455 on your 2022 Sierra means a large EVAP leak. Check for P0449 as well—it's a GM companion code. Gas cap first.
Evidence
- Check engine light on
- P0455 (possibly P0449) stored
- Possible fuel odor
- Gas cap issue
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
- Vent Valve Solenoid (Medium Likelihood): GM's known EVAP weak point. $100–$220 installed.
- Purge Solenoid (Medium Likelihood): Stuck open. $110–$240 installed.
- Vapor Line (Low Likelihood): Truck bed damage. $80–$220.
- Charcoal Canister (Low Likelihood): Saturated. $180–$380 installed.
Warranty
Your 2022 Sierra may still be under GM's 3-year/36,000-mile warranty. Federal emissions (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect any engine, 4WD, towing, or features.