Examining P0456 on Your 2022 Colorado
Your 2022 Colorado (2nd generation, final model year before the 2023 redesign) has triggered P0456—a very small EVAP leak. The 2.5L four-cylinder, 3.6L V6, or 2.8L Duramax diesel all share GM's EVAP system. Check warranty before spending out of pocket.
Symptoms
- Check engine light on
- P0456 on scan
- No towing or performance issues
- Gas cap may not click
Top Causes
- Gas Cap Seal (High Likelihood): Worn after 3+ years. $0–$15 (warranty may cover).
- Vent Valve Solenoid (High Likelihood): GM's common EVAP failure. $0–$220 (warranty may cover).
- Purge Solenoid (Medium Likelihood): Heat and vibration. $0–$200 (warranty may cover).
- EVAP Hose (Medium Likelihood): Truck use stress. $0–$250 (warranty may cover).
- FTP Sensor (Low Likelihood): Sensitivity. $120–$260.
Diagnosis
- Reseat gas cap—listen for click
- Check warranty—GM 3yr/36k runs through 2025
- Dealer appointment if covered
- Clear code and monitor if not
- Smoke test for persistent codes
Costs
- Under warranty: $0
- Gas cap: $10–$15
- Vent valve solenoid: $80–$220
- Purge solenoid: $80–$200
Can I Tow?
Yes. P0456 does not affect towing, payload, ZR2 features, or any truck capability.
Warranty
GM's 3yr/36k runs through 2025. Federal emissions (8yr/80k) covers EVAP through 2030. The 2022 is the last 2nd-gen Colorado—parts are abundant.