Diagnosing P0455 on Your 2022 Buick Envision
A P0455 on your 2022 Envision (2nd generation) indicates a large EVAP leak. The 2.0L turbo on GM's E2 platform uses GM EVAP vent solenoid technology. Buick's premium warranty runs through 2026.
Clues
- Check engine light on
- P0455 stored
- Possible fuel odor
- Gas cap not seating
Suspects Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
- EVAP Vent Solenoid Valve (Medium Likelihood): GM vent valve. $120–$250 installed.
- Purge Valve/Solenoid (Medium Likelihood): Sticking valve. $100–$220 installed.
- EVAP Canister (Low Likelihood): Charcoal saturation. $200–$400 installed.
- Vapor Line (Low Likelihood): Connection issue. $80–$200.
Diagnosis
Gas cap first. If P0455 returns after 2–3 days, your Buick dealer with GDS2 or a smoke test will locate the leak.
Warranty
Buick's 4yr/50k warranty runs through 2026. Federal emissions (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect the turbo engine, AWD, or any features.