Investigating P0455 on Your 2022 Cadillac Escalade
A P0455 on your 2022 Escalade (5th generation GMT1XX) signals a large EVAP leak. Whether you have the 6.2L V8 or 3.0L Duramax diesel, gas-powered models share the GM EVAP system with vent solenoid. Cadillac's premium warranty runs through 2026.
Evidence
- Check engine light illuminated
- P0455 stored in ECM
- Possible fuel smell
- Gas cap not clicking
- Check for P0449 companion code
Suspects Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
- EVAP Vent Solenoid Valve (Medium Likelihood): GM's known weak point. $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 on the large fuel system. $80–$200.
Diagnostic Approach
Gas cap first. If P0455 persists, your Cadillac dealer with GDS2 diagnostics will identify the issue. The Escalade's large fuel tank means more EVAP connections to inspect. Check for P0449 companion code, which points to the vent solenoid.
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 V8/diesel performance, 4WD, Magnetic Ride, Super Cruise, towing, or any Escalade features.