Investigating P0440 on Your 2024 Jeep Cherokee
Your 2024 Jeep Cherokee has triggered a P0440 code — an EVAP system malfunction. The Cherokee (KL platform) is powered by a 2.4L Tigershark four-cylinder (180 hp) or 3.2L Pentastar V6 (271 hp), both paired with a 9-speed automatic and available Jeep Active Drive 4WD. As a newer vehicle, P0440 is most likely a minor issue. Let's trace the evidence.
Symptoms to Watch For
- Check engine light illuminated
- Faint gasoline odor
- Slight fuel economy decrease
- Fuel nozzle clicking off early at fill-ups
- Failed emissions inspection
Your Cherokee drives perfectly normally. The engine, 9-speed automatic, and 4WD system are completely unaffected by P0440.
Top Suspects: Ranked by Likelihood
- Gas Cap Not Fully Seated — Always the first suspect. Estimated repair: $0–$25.
- Purge Solenoid Valve — Controls vapor flow from the charcoal canister to the engine intake. Manufacturing defect or early failure. Estimated repair: $80–$210 (warranty-covered).
- Vent Valve/Solenoid — Manages fresh air entry into the EVAP system near the charcoal canister. Estimated repair: $90–$235 (warranty-covered).
- EVAP Hose or Fitting — A factory connection not fully secured. Estimated repair: $0–$100 (warranty).
- Fuel Tank Pressure Sensor — Providing inaccurate readings to the PCM. Estimated repair: $95–$250 (warranty).
Diagnostic Steps
- Check gas cap — remove, inspect seal, reinstall until it clicks
- Clear code, drive 50+ miles, monitor for return
- Schedule Jeep dealer appointment if code persists — warranty applies
- Dealer will perform EVAP smoke test and component diagnostics
- Check for TSBs on the KL Cherokee
Repair Cost Breakdown
- Gas cap: $0–$25
- Purge solenoid: $80–$210 (warranty)
- Vent valve: $90–$235 (warranty)
- EVAP fitting: $0–$100 (warranty)
- FTP sensor: $95–$250 (warranty)
Warranty: Your 2024 Cherokee is covered by Jeep's 3-year/36,000-mile basic warranty. All EVAP repairs should be free at the dealer.
Can I Drive With P0440?
Yes. P0440 is a low-severity emissions code with no impact on drivability, safety, or 4WD capability.
DIY or Dealer?
Dealer — your 2024 Cherokee is under warranty. Let Jeep handle it at no cost.