P1456: owner reports and bulletins

Powertrain (manufacturer-specific). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P1456 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

5 complaints filed with NHTSA mention P1456, 1 of them since 2015, across 3 different models. The component owners most often filed it under: engine and engine cooling:exhaust system:emission control .

Most-reported models

VehicleComplaintsModel years reported
HONDA ACCORD31998

Manufacturer service bulletins that name P1456

1 technical service bulletins and manufacturer communications filed with NHTSA mention P1456, from 1 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • ACURA NSX (1997, 1998, 1999, 2000), bulletin 10099960: "SERVICE BULLETIN - THIS BULLETIN UPDATES THE TROUBLESHOOTING PROCEDURES FOR DTC P1456 (EVAP CONTROL SYSTEM LEAKAGE [FUEL TANK SYSTEM]) AND DTC P1457 (EVAP CONTROL SYSTEM LEAKAGE[EVAP CANISTER SYSTEM]). DEPENDING ON THE …

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.