Tracking P0455 on Your 2022 Cadillac XT6
A P0455 on your 2022 XT6 indicates a large EVAP leak. The 3-row luxury crossover with the 2.0L turbo-4 or 3.6L V6 on GM's C1XX platform uses the GM EVAP vent solenoid system. Your Cadillac warranty runs through 2026.
Clues
- Check engine light on
- P0455 stored in ECM
- P0449 companion code possible
- 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): Saturation. $200–$400 installed.
- Vapor Line (Low Likelihood): Connection issue. $80–$200.
Next Steps
Gas cap first. Drive 2–3 days. If P0455 returns, your Cadillac dealer with GDS2 diagnostics or a smoke test will find the leak.
Warranty
Cadillac's 4yr/50k warranty runs through 2026. Federal emissions (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect the engine, AWD, or any XT6 features.