Decoding the P0440 on Your 2024 Acura MDX
A P0440 code on your 2024 Acura MDX means the PCM has detected an EVAP system malfunction. Your three-row luxury SUV is fully covered under Acura's comprehensive warranty, making this a straightforward dealer repair.
The 2024 MDX EVAP System
The MDX, available with the 3.5L V6 or 3.0L turbo V6 (Type S), uses Honda/Acura's EVAP design:
- Purge Control Solenoid Valve (PCSV) — Honda/Acura's purge valve for vapor routing
- Bypass Solenoid Valve — Honda-specific vapor flow management
- Canister Vent Shut Valve — System sealing for leak tests
- Charcoal Canister — Vapor storage
- FTP Sensor — In-tank pressure monitoring
- Fuel Filler Cap — System seal
Most Likely Causes
- Gas Cap Issue (35%) — Not fully seated after fueling. Cost: $0.
- Factory Assembly Issue (22%) — EVAP connection from production. Cost: $0 under warranty.
- PCSV Defect (15%) — Factory purge valve defect. Cost: $0 under warranty.
- Software Calibration (12%) — PCM update. Cost: $0 under warranty.
- Vent Valve Issue (10%) — Not sealing properly. Cost: $0 under warranty.
- Bypass Solenoid (6%) — Honda-specific component. Cost: $0 under warranty.
Acura Warranty
- Basic: 4 years/50,000 miles
- Powertrain: 6 years/70,000 miles
Check the gas cap first. If the code persists, your Acura dealer handles the rest at no cost.
The Verdict
The P0440 on your 2024 MDX is a warranty repair. Acura's 4-year/50,000-mile coverage is among the better luxury warranties. Check the gas cap, then let the dealer diagnose using Honda's HDS diagnostic system.