P1456 — EVAP Control System Leakage (Fuel Tank System)
SAFEIs it safe to drive? Generally OK to keep driving — fix it at your convenience.
What P1456 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1456 means on specific makes
Honda / Acura SAFE
EVAP leak detected on the fuel-tank side of the system. The classic first suspect is a loose or worn gas cap; otherwise a tank-side seal or the fuel tank pressure sensor.
- Loose/faulty gas cap (check FIRST, ~$15)
- Fuel tank pressure (FTP) sensor
- Tank-side hose/seal leak
Check first: Tighten/replace the gas cap and clear; if it returns, smoke-test the tank side and check the FTP sensor. Very common on Hondas.
Source: hondacodes.wordpress.com