Decoding the P0440 on Your 2024 Acura RDX
A P0440 code on your 2024 Acura RDX means the PCM has detected an EVAP system malfunction. Your compact luxury SUV is fully covered under Acura's warranty, making this a straightforward dealer visit.
The 2024 RDX EVAP System
The RDX with its 2.0-liter turbocharged engine uses Honda/Acura's EVAP design:
- PCSV — Purge Control Solenoid Valve for vapor routing
- Bypass Solenoid — Honda-specific vapor management
- Vent Shut Valve — System sealing for tests
- Charcoal Canister — Vapor storage
- FTP Sensor — Fuel tank pressure monitoring
- Fuel Filler Cap — System seal
Most Likely Causes
- Gas Cap Issue (35%) — Not seated after fueling. Cost: $0.
- Factory Issue (22%) — Assembly connection. Cost: $0 under warranty.
- PCSV Defect (15%) — Factory purge valve fault. Cost: $0 under warranty.
- Software Update (12%) — PCM calibration. Cost: $0 under warranty.
- Vent Valve Issue (10%) — Not sealing. Cost: $0 under warranty.
- Bypass Solenoid (6%) — Honda-specific. Cost: $0 under warranty.
Acura Warranty
- Basic: 4 years/50,000 miles
- Powertrain: 6 years/70,000 miles
Check the gas cap. If the code persists, your Acura dealer handles the rest.
The Verdict
The P0440 on your 2024 RDX is a warranty repair. Check the gas cap, then let the dealer diagnose using Honda's HDS system at no cost to you.