P0442 on Your 2024 Acura TLX
A P0442 code on your 2024 Acura TLX indicates a small evaporative emission system leak. On a brand-new sport sedan, this is typically caused by something minor — your Acura warranty covers the repair completely.
EVAP System
The 2024 TLX uses Honda/Acura's EVAP system with a bypass solenoid valve, canister vent shut valve, and charcoal canister. Whether your TLX has the 2.0L turbo or 3.0L twin-turbo Type S, the EVAP architecture is the same.
Likely Causes
- Gas cap not fully seated (45%) — Honda/Acura's most common P0442 trigger.
- Gasket contamination (20%) — Debris on the cap seal.
- EVAP connection looseness (15%) — A factory fitting that vibrated loose.
- Bypass solenoid valve defect (10%) — A rare factory defect.
- Canister vent shut valve defect (10%) — A manufacturing imperfection.
What to Do
Reseat your gas cap. If the code persists, visit your Acura dealer. HDS provides comprehensive EVAP testing. All repairs are warranty-covered.
Costs ($0 Under Warranty)
- Gas cap: $20–$45
- EVAP hose repair: $80–$240
- Bypass solenoid valve: $120–$290
- Canister vent shut valve: $110–$270
Warranty
Your 2024 TLX is covered under Acura's 4-year/50,000-mile basic warranty, 6-year/70,000-mile powertrain warranty, and federal 8-year/80,000-mile emissions warranty. All P0442 repairs are free.