Uncovering P0455 on Your 2022 Buick Enclave
A P0455 on your 2022 Enclave (2nd generation) indicates a large EVAP leak. The 3.6L V6 on GM's C1XX platform uses the same GM EVAP system with vent solenoid as other GM vehicles. Your Buick warranty runs through 2026.
Evidence
- Check engine light on
- P0455 stored in ECM
- Possible fuel smell
- Gas cap not clicking
Causes 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. $100–$220 installed.
- EVAP Canister (Low Likelihood): Charcoal saturation. $200–$400 installed.
- Vapor Line/Hose (Low Likelihood): Connection issue. $80–$200.
Diagnosis
Gas cap first. Drive 2–3 days. If P0455 returns, GM GDS2 diagnostics or a smoke test will locate the leak. Check for P0449 companion code.
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 V6, AWD, or any Enclave features.