P0440 on Your 2022 Chevrolet Traverse: Gathering the Evidence
A P0440 code on your 2022 Chevrolet Traverse sends you on an investigation into the EVAP (Evaporative Emission Control) system. The Traverse continues with the proven 3.6L V6 and 9-speed automatic transmission on GM's C1XX platform. The EVAP system on this model year is well-documented, and common failure points are easy to identify. Here's what we've uncovered.
Symptoms Observed
- Check engine light on
- Faint fuel odor
- Marginal fuel economy decrease
- Fueling issues at the pump
- Emissions test failure
Your Traverse will drive identically with or without P0440 active. No performance, handling, or safety concerns.
Ranked Causes
- Gas Cap Issue — Worn gasket or improper seating. Always the first check. Estimated repair: $5–$25.
- Vent Valve Solenoid — GM's most frequent EVAP failure component across the lineup. Estimated repair: $80–$200.
- Purge Valve Solenoid — The purge valve on the 3.6L V6 can develop sticking issues over time. Estimated repair: $70–$180.
- FTP Sensor Drift — The fuel tank pressure sensor may report inaccurate data. Estimated repair: $95–$240.
- Vapor Line Leak — Rubber hoses or connections may have developed minor leaks. Estimated repair: $45–$135.
Diagnosis Steps
- Check and replace gas cap if worn
- Scan for all EVAP codes
- Test vent and purge solenoids
- Smoke test the EVAP system
- Monitor FTP sensor live data
Cost Breakdown
- Gas cap: $5–$25
- Vent valve solenoid: $80–$200
- Purge valve: $70–$180
- FTP sensor: $95–$240
- Vapor line repair: $45–$135
- Diagnostic: $80–$150
Safe to Drive?
Absolutely. P0440 is purely an emissions concern with zero drivability impact.
Repair Approach
Start with the gas cap. If that doesn't resolve it, the vent valve solenoid is the most likely mechanical cause and a popular DIY repair on GM vehicles.