Following P0455 Clues on Your 2022 Buick Encore GX
A P0455 on your 2022 Encore GX signals a large EVAP leak. The small turbo 3-cylinder (1.2L or 1.3L) on GM's GEM platform uses the same GM EVAP vent solenoid system. Buick's warranty runs through 2026.
Evidence
- Check engine light illuminated
- P0455 stored in ECM
- Possible fuel odor
- Gas cap not clicking
Causes by Likelihood
- 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. $100–$220 installed.
- EVAP Canister (Low Likelihood): Saturation. $200–$400 installed.
- Vapor Line (Low Likelihood): Connection issue. $80–$200.
Next Steps
Replace the gas cap and drive 2–3 days. If P0455 persists, your Buick dealer with GDS2 or a GM-experienced shop can diagnose efficiently.
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, CVT/9-speed, AWD, or any features.