Diagnostic code · Emissions / EVAP
Honda P1457 Code: EVAP Leak (Canister System)
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What P1457 means
P1457 stands for “Evaporative Emission Control System Leakage (Control Canister System).” It’s a Honda-specific code — the P1400-series numbers are manufacturer-defined — and the key thing it tells you is where the leak is: the canister side of the EVAP system, not the fuel cap or tank.
That distinction matters. The generic EVAP codes most cars throw — P0455, P0456, and P0457 — usually start with the gas cap. P1457 doesn’t. Here the prime suspect is the EVAP canister vent shut valve (the valve that seals the charcoal canister so the system can run its leak test), followed by the bypass solenoid valve and the canister-side hoses. Tightening the cap rarely fixes a P1457.
Honda’s related code P1456 covers the fuel-tank side of the same system, so between the two, the computer is telling you which half to look at. Because the leak is often small and the canister sits low or toward the rear of the car, a smoke test is the fastest way to confirm exactly where it’s escaping before you replace anything. For the broader picture, see the Honda check engine light guide.
Common causes most common first
- Faulty EVAP canister vent shut valve
- Faulty bypass solenoid valve
- Cracked or disconnected hose on the canister side
- Failed charcoal (EVAP) canister
- Faulty two-way (pressure/vacuum relief) valve
- Loose/worn gas cap or fuel-tank-side leak
Do these checks first
- Know what P1457 means: it's the canister-system side. P1456 is the fuel-tank side, so this code points you away from the cap and toward the canister.
- Inspect the EVAP canister vent shut valve and bypass solenoid — the two most common P1457 parts — and their connectors.
- Check the hoses around the charcoal canister (often near the rear of the car or under it) for cracks or disconnection.
- Smoke-test the canister side of the EVAP system to pinpoint the leak before replacing parts.
Repair cost
An EVAP canister vent shut valve or bypass solenoid is typically $50–$250 installed. A full charcoal canister is more, around $150–$300+. The gas cap is rarely the cause of this particular code.