Investigating the P0440 Code on Your Dodge Hornet
A P0440 code on your Dodge Hornet means the Powertrain Control Module (PCM) has detected an EVAP system malfunction. The Hornet — Dodge's entry into the compact SUV segment, based on the Alfa Romeo Tonale platform — uses a different EVAP architecture than traditional Stellantis vehicles, reflecting its Italian engineering heritage.
The Hornet's EVAP System
Your Hornet with the 2.0-liter turbocharged four-cylinder engine (GME-T4) uses a modern EVAP design:
- Purge Solenoid Valve — Controls fuel vapor flow from the charcoal canister to the turbocharged engine's intake
- Canister Vent Valve — Manages atmospheric venting and seals the system for leak testing
- Charcoal Canister — Stores fuel vapors using activated carbon
- Fuel Tank Pressure Sensor — Monitors pressure during EVAP self-diagnostic tests
- Leak Detection System — Monitors system integrity using pressure changes
- Fuel Filler Cap — Seals the fuel system
Ranked Causes
- Gas Cap Issue (30% of cases) — Not properly seated after fueling. Cost: $0 to reseat, $12–$25 for new cap.
- Purge Solenoid Valve (22%) — The turbo engine's heat can stress the purge valve. Cost: $30–$70, $100–$230 with labor.
- Factory Assembly Issue (18%) — As a new model, early production EVAP connections may not be fully seated. Cost: $0 under warranty.
- Canister Vent Valve (12%) — Failure to seal during leak testing. Cost: $35–$75, $100–$240 with labor.
- EVAP Hose Issue (10%) — Connection or routing problem. Cost: $10–$35, $70–$180 with labor.
- Software Calibration (8%) — PCM EVAP monitoring parameters. Cost: $0 under warranty.
Warranty Coverage
Your Hornet should be within Stellantis' warranty:
- Basic: 3 years/36,000 miles
- Powertrain: 5 years/60,000 miles
Check the gas cap first. If the code persists, schedule a dealer appointment. As a newer model, your dealer may have TSBs specific to the Hornet platform.
The Verdict
The Hornet's EVAP system differs from traditional Dodge vehicles due to its Alfa Romeo-derived platform. A P0440 is most likely a gas cap issue or early-production variation covered under warranty. Let your dealer handle the diagnostics — the Hornet uses unique tooling and service procedures compared to other Dodge models.