Investigating P0440 on Your 2024 Jeep Grand Wagoneer
Your 2024 Jeep Grand Wagoneer has triggered a P0440 code — an EVAP system malfunction. This flagship luxury SUV comes with a 3.0L Hurricane twin-turbo inline-six (510 hp in the S variant or 420 hp standard), paired with an 8-speed automatic and Quadra-Drive II 4WD. As a brand-new premium vehicle under warranty, P0440 should be handled quickly by the dealer. Let's examine the evidence.
Symptoms to Watch For
- Check engine light illuminated
- Faint gasoline odor
- Slight fuel economy decrease
- Fuel nozzle clicking off early
- Failed emissions inspection
Your Grand Wagoneer drives perfectly normally. The Hurricane engine, 8-speed, 4WD, air suspension, and all luxury features are unaffected.
Top Suspects: Ranked by Likelihood
- Gas Cap Not Fully Seated — Simplest cause. Estimated repair: $0–$30.
- Purge Solenoid Valve Defect — Manufacturing defect on the new Hurricane engine's EVAP system. Estimated repair: $95–$240 (warranty-covered).
- Vent Valve/Solenoid Issue — Early failure near the charcoal canister. Estimated repair: $100–$260 (warranty-covered).
- Loose Factory Fitting — Assembly issue with the new platform. Estimated repair: $0–$100 (warranty).
- Fuel Tank Pressure Sensor — Inaccurate readings from the large tank's sensor. Estimated repair: $105–$280 (warranty).
Diagnostic Steps
- Check gas cap — remove, inspect, reinstall firmly
- Clear code, drive 50+ miles, monitor
- Schedule Jeep dealer appointment — this is a warranty repair
- Dealer will perform full EVAP system diagnostics
- Check for TSBs on the Hurricane-powered Grand Wagoneer
Repair Cost Breakdown
- Gas cap: $0–$30
- Purge solenoid: $95–$240 (warranty)
- Vent valve: $100–$260 (warranty)
- Factory fitting: $0–$100 (warranty)
- FTP sensor: $105–$280 (warranty)
Warranty: Your 2024 Grand Wagoneer is fully covered by Jeep's 3-year/36,000-mile basic warranty. All EVAP repairs are free at the dealer.
Can I Drive With P0440?
Yes. P0440 is emissions-only. Your Grand Wagoneer is fully functional.
DIY or Dealer?
Dealer — your premium vehicle is under warranty. No reason for DIY when repairs are covered.