Investigating P0440 on Your 2024 Subaru Impreza
Your 2024 Subaru Impreza has triggered a P0440 code — an EVAP system malfunction. The completely redesigned sixth-generation Impreza is now hatchback-only, built on the updated Subaru Global Platform with a 2.0L Boxer four-cylinder (152 hp), Lineartronic CVT, and standard Symmetrical AWD. As a brand-new vehicle, this code likely indicates something simple. Let's gather the clues.
Symptoms to Watch For
- Check engine light illuminated
- Faint gasoline odor
- Slight fuel economy decrease
- Fuel nozzle shutting off early at fill-ups
- Failed emissions inspection
Your Impreza drives perfectly normally. The Boxer engine, CVT, and AWD are all unaffected.
Top Suspects: Ranked by Likelihood
- Gas Cap Not Fully Seated — Traditional threaded cap. Always check first. Estimated repair: $0–$25.
- Purge Control Valve Defect — Manufacturing defect or early failure on the new platform. Estimated repair: $75–$200 (warranty-covered).
- Vent Control Valve Issue — Early failure near the charcoal canister. Estimated repair: $85–$220 (warranty-covered).
- Loose Factory Connection — Assembly-related EVAP fitting not fully secured. Estimated repair: $0–$80 (warranty).
- Fuel Tank Pressure Sensor — Sensor providing inaccurate data. Estimated repair: $90–$235 (warranty).
Diagnostic Steps
- Check gas cap — remove, inspect, reinstall firmly
- Clear code, drive 50+ miles, monitor for return
- Schedule Subaru dealer appointment if code persists
- Dealer will perform EVAP smoke test and component diagnostics
- Check for TSBs on the redesigned 2024 Impreza
Repair Cost Breakdown
- Gas cap: $0–$25
- Purge control valve: $75–$200 (warranty)
- Vent control valve: $85–$220 (warranty)
- EVAP connection: $0–$80 (warranty)
- FTP sensor: $90–$235 (warranty)
Warranty: Your 2024 Impreza is covered by Subaru's 3-year/36,000-mile basic warranty. EVAP repairs are free at the dealer.
Can I Drive With P0440?
Yes. P0440 is emissions-only. Your Impreza is fully functional.
DIY or Dealer?
Dealer — your 2024 Impreza is under warranty. All EVAP repairs are covered at no cost to you.