Tracking Down P0440 on Your 2024 Jeep Grand Cherokee
Your 2024 Jeep Grand Cherokee has flagged a P0440 code — an EVAP system malfunction. The fifth-generation Grand Cherokee (WL platform) comes with a 3.6L Pentastar V6 (293 hp), 2.0L turbo four (270 hp), or available 6.4L V8 (471 hp in the SRT). All use EVAP systems designed for both highway luxury and serious off-road capability. As a new vehicle under warranty, this is most likely a minor issue. Let's examine the evidence.
Symptoms to Watch For
- Check engine light illuminated
- Faint gasoline odor
- Slight fuel economy decrease
- Fuel nozzle shutting off early
- Failed emissions inspection
Your Grand Cherokee drives perfectly normally. The engine, 8-speed automatic, Quadra-Trac/Quadra-Drive 4WD, and air suspension are all unaffected.
Top Suspects: Ranked by Likelihood
- Gas Cap Not Fully Seated — The Grand Cherokee uses a traditional threaded cap. Estimated repair: $0–$25.
- Purge Solenoid Valve Defect — Manufacturing defect or early failure. Estimated repair: $85–$225 (warranty-covered).
- Vent Valve/Solenoid Issue — Located near the charcoal canister. Early failure or connector issue. Estimated repair: $95–$250 (warranty-covered).
- Loose EVAP Fitting — Factory connection not fully secured. Estimated repair: $0–$95 (warranty).
- Fuel Tank Pressure Sensor — Providing inaccurate readings. Estimated repair: $100–$265 (warranty).
Diagnostic Steps
- Check gas cap — remove, inspect, reinstall firmly
- Clear code, drive 50+ miles, monitor for return
- Schedule Jeep dealer appointment — warranty covers this
- Dealer will perform EVAP smoke test and diagnostics
- Check for TSBs or recalls on the WL Grand Cherokee
Repair Cost Breakdown
- Gas cap: $0–$25
- Purge solenoid: $85–$225 (warranty)
- Vent valve: $95–$250 (warranty)
- EVAP fitting: $0–$95 (warranty)
- FTP sensor: $100–$265 (warranty)
Warranty: Your 2024 Grand Cherokee is 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 Cherokee is fully functional on and off-road.
DIY or Dealer?
Dealer — your 2024 Grand Cherokee is under warranty. Let Jeep handle it at no cost.