P1457
EVAP Emission Control System Leakage (EVAP Canister Side)
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The P1457 code is Honda's manufacturer-specific code for an EVAP system leak detected on the canister side — the portion of the evaporative emission system between the charcoal canister and the engine, as opposed to the fuel tank side (P1456). The charcoal canister stores fuel vapors and releases them to the engine for combustion. When a leak is detected in this part of the system, the code is stored.
Honda issued a Technical Service Bulletin (TSB) identifying the EVAP canister vent shut valve (also called the bypass solenoid) as a known failure point for this code. Water can enter the solenoid and cause internal corrosion, especially in regions that use road salt in winter. This makes it fail to seal properly during the EVAP self-test. The solenoid is typically located near the charcoal canister under the vehicle and costs $50–$100 for the part.
Like P1456, this code generally does not affect drivability. Your car will run fine, but it will fail an emissions test and the Check Engine light will stay on. Start diagnosis by inspecting the canister vent shut valve and the hoses around the charcoal canister. A smoke test performed by a shop can quickly identify the leak source. Replacing the vent shut valve is a straightforward repair — it's typically held in with one or two bolts near the charcoal canister, though accessing it may require getting under the vehicle.
Severity
Symptoms
- •Check Engine light illuminated
- •Faint fuel vapor smell near rear of vehicle
- •Failed emissions inspection
- •No noticeable change in drivability
- •Slightly reduced fuel economy
- •Possible hissing sound from under the vehicle
Likely Causes
Honda issued a TSB for this — the canister vent shut valve is prone to corrosion from water intrusion, especially in regions with road salt, causing it to stick open.
The charcoal canister can develop cracks from physical damage, age, or fuel saturation, creating vapor leaks.
Rubber hoses connecting the charcoal canister to the rest of the EVAP system can crack, loosen, or deteriorate over time.
A stuck-open purge valve can cause incorrect pressure readings in the EVAP system, leading to a canister-side leak detection.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the EVAP canister vent shut valve (bypass solenoid)
- Inspect and replace cracked charcoal canister
- Replace deteriorated EVAP hoses and tighten connections
- Replace faulty purge control solenoid valve