Decoding the P0440 on Your 2024 Acura TLX
A P0440 code on your 2024 Acura TLX means the PCM has detected an EVAP system malfunction. Your sport sedan is fully covered under Acura's generous warranty — making this a simple dealer visit for a free repair.
The 2024 TLX EVAP System
The TLX, available with the 2.0L turbo or 3.0L turbo V6 (Type S), uses Honda/Acura's EVAP design:
- PCSV — Purge Control Solenoid Valve
- Bypass Solenoid — Honda-specific vapor management
- Vent Shut Valve — System sealing
- 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 Assembly Issue (22%) — EVAP connection. Cost: $0 under warranty.
- PCSV Defect (15%) — Purge valve fault. Cost: $0 under warranty.
- Software Update (12%) — PCM calibration. Cost: $0 under warranty.
- Vent Valve Issue (10%) — Sealing problem. 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. If the code persists, your Acura dealer will diagnose and repair at no cost.
The Verdict
The P0440 on your 2024 TLX is a warranty repair under Acura's 4-year/50,000-mile coverage. Check the gas cap, then let the dealer handle the rest using Honda's HDS diagnostic system. Honda/Acura reliability means this is a one-time minor fix.