Diagnostic code · Emissions / EVAP

Honda P1457 Code: EVAP Leak (Canister System)

Updated October 8, 2026Sources

On this page 4 sections

Meaning: A Honda-specific EVAP leak on the canister side of the system, not at the fuel cap.
Checks to start with: The EVAP canister vent shut valve or the bypass solenoid valve.
Safe to drive?: If the light is steady, Honda says to avoid high speeds and have the vehicle inspected immediately. If it starts flashing, stop safely. It also won't pass emissions.

P1457 is a Honda-specific EVAP code that points at the charcoal-canister side of the system, not the gas cap. Unlike the generic P0455/P0457 codes, tightening the cap won't fix this one. Check the canister vent shut valve and bypass solenoid instead.

What P1457 means

P1457 stands for “Evaporative Emission Control System Leakage (Control Canister System).” It’s a Honda-specific code (P1400-series numbers are manufacturer-defined), and the key thing it tells you is where the leak is: on the canister side of the EVAP system, not at the fuel cap or tank.

That distinction matters. The generic EVAP codes most cars throw (P0455, P0456 and P0457) start with the gas cap. P1457 doesn’t. Here the parts to check are the EVAP canister vent shut valve (the valve that seals the charcoal canister so the system can run its leak test), the bypass solenoid valve and the canister-side hoses.

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 can be 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.

Possible causes

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 flags the canister side of the system. 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, the bypass solenoid and their connectors. These are the canister-side valves this code points to.
Check the hoses around the charcoal canister (near the rear of the car or under it on many models) for cracks or disconnection.
Smoke-test the canister side of the EVAP system to pinpoint the leak before replacing parts.

FAQ

What does the P1457 code mean on a Honda?

P1457 is a Honda-specific code for an evaporative emissions (EVAP) leak detected on the control-canister side of the system (the charcoal canister and its valves) rather than the fuel-tank or gas-cap side. The parts to check are the EVAP canister vent shut valve, the bypass solenoid valve and the canister-side hoses.

Is P1457 caused by a loose gas cap?

Not by its definition. Unlike the generic EVAP codes (P0455, P0457), P1457 points specifically at the canister side of the system, not the gas cap. The parts to check are the canister vent shut valve and the bypass solenoid valve.

What is the difference between P1456 and P1457 on a Honda?

Both are Honda-specific EVAP leak codes; the difference is location. P1456 is a leak on the fuel-tank side of the system, while P1457 is a leak on the control-canister side. P1457 sends you to the charcoal canister and its vent/bypass valves rather than the tank or cap.

Is it safe to drive with a P1457 code?

If the check engine light is steady, Honda says to avoid high speeds and have the vehicle inspected immediately. If the light starts flashing, stop safely. With P1457 the system is venting a small amount of fuel vapor, and the car won't pass an emissions test until it's fixed.

Sources

Owner's manual references are to the model and year named above. Wording and procedures can differ on your Honda, so check your own owner's manual.

How we source and correct →