2022 Cadillac XT5 P0455: Large EVAP Leak Fix

Investigating P0455 on Your 2022 Cadillac XT5

A P0455 on your 2022 XT5 signals a large EVAP leak. The 2.0L turbo-4 or 3.6L V6 on GM's C1XX platform uses the same GM EVAP vent solenoid system. Your Cadillac 4-year/50,000-mile warranty runs through 2026.

Evidence

• Check engine light illuminated
• P0455 stored in ECM
• Possible fuel smell
• Gas cap not clicking

Suspects Ranked

1. Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
2. EVAP Vent Solenoid Valve (Medium Likelihood): GM vent valve. $120–$250 installed.
3. Purge Valve/Solenoid (Medium Likelihood): Sticking. $100–$220 installed.
4. EVAP Canister (Low Likelihood): Charcoal saturation. $200–$400 installed.
5. Vapor Line/Hose (Low Likelihood): Connection issue. $80–$200.

Diagnosis

Gas cap first. Drive 2–3 days. If P0455 returns, your Cadillac dealer with GDS2 or a smoke test will locate the leak. Check for P0449 companion code.

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 XT5 features.

Frequently Asked Questions