P1457 Error Code On Your Car | Causes, Fixes, And Costs

The evaporative emission control (EVAP) system is designed to store and burn fuel vapor. Fuel vapor consists of hydrocarbons (HCs) that are harmful to the environment; for this reason, fuel vapors are stored in the charcoal canister before being redirected to the vehicle's intake system to be burned. The EVAP system not only reduces harmful vapors from entering the atmosphere, but it also improves the gas mileage of the vehicle. The Powertrain Control Module (PCM) is responsible for setting Diagnostic Trouble Codes (DTCs) for the EVAP system. Vehicles such as the Honda Civic and Honda Accord may set the manufacturer-specific code P1457, known as an EVAP Control System Leakage (EVAP Canister System). In this article, we are going to take a deeper look at the P1457 error code, covering common symptoms, how to repair them, and how much it costs to fix.

P1457 Error Code

Code Number

Code Description

Related Code

P1457

EVAP Control System Leakage (EVAP Canister System)

P1456 - EVAP Control System Leakage (EVAP Fuel Tank System)

If your engine light illuminates and your car fails an emissions test, it could be experiencing an evaporative emission control system leak.

The P1457 error code is a two-trip detection fault code that is set by the PCM. Similar to the P0456 and P0442 fault codes, the P1457 code - which can be found on the Honda Civic and other Honda models - occurs when an EVAP system leak is detected between the canister and the engine. The related P1456 code indicates a leak between the canister and the fuel tank.

The EVAP system is capable of detecting very small leaks. These leaks can occur anywhere throughout the EVAP system as the pressure and vacuum of the fuel tank is monitored via a tank pressure sensor. This code may be difficult to replicate once cleared due to its two-trip detection cycle and the specific conditions to set the code.

The P1457 Honda fault code can be set by the following faults:

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The following are the commonly reported symptoms with the P1457 code:

Most drivers report that the vehicle remains operable and only notice minor decreases in performance. However, more severe symptoms, such as stalling, can occur. If your vehicle is running rough and stalling, we recommend seeking repairs immediately. If the vehicle feels mostly normal, you can continue driving for a bit before needing to get repairs. Additionally, you may notice a fuel odor while driving and/or fail emissions testing.

Like other fault code diagnoses, you’ll want to have the system scanned to confirm the fault code is present and active before making any repair attempts. System scans can be performed by local parts stores, repair facilities, emissions testing centers, and by yourself, if you possess a scanner. When it comes to EVAP-related codes, they may clear themselves if the system passes the self-test. Additionally, the EVAP system will not run a conclusive self-test if the vehicle has less than a quarter tank of fuel or more than three-quarters of a tank. Furthermore, the P1457 error code uses two-trip detection logic. This means the code will only be set after the fault pattern has been exhibited for two trips. The proper diagnosis of a leaking EVAP system will need to be performed using an EVAP smoke machine. Below, we’ll cover the common ways to repair the P1457 code.

EVAP hoses can crack, tear, or become the victim of rodents. This can all lead to a leaking EVAP system and the possibility of the P1457 code activating. Before making any component replacement, we recommend you perform a thorough visual inspection of the hoses, filler neck, and gas cap. If you can smell fuel or see dampness on EVAP component surfaces, it’s most likely leaking.

The purge valve is responsible for control of the fuel vapor entering the engine. Testing a purge valve will usually require a vacuum pump and gauge. It's also possible to test the purge valve by following these steps:

The bypass valve is used by the EVAP system to perform a self-diagnosis leak test. A faulty valve can lead to the EVAP test failing, setting the P1457 diagnostic code. The bypass valve can be tested with a vacuum pump by applying vacuum to one port and checking if the valve is sealed. If the bypass valve leaks vacuum, it needs to be replaced.

The canister vent valve allows fresh air to enter the system to prevent excessive vacuum from building inside the fuel tank. If the vent valve leaks, the tank pressure sensor will always read atmospheric pressure. You can view this data using a scan tool to help diagnose if the vent valve is sealing or not. If you do not possess a scanner, you can test the vent valve as you would the bypass and purge valves. If the vent valve is incapable of sealing vacuum, it will need to be replaced.

A charcoal canister has a vacuum pump and storage chamber. Canisters can become over-saturated with fuel and require replacement over time. One way to prevent this is to not continuously add fuel after the fuel pump has shut off when refueling the vehicle. Replacement canisters typically come with new vent valves and bypass valves, so many people tend to recommend a canister replacement when possible as it’s cheaper in the long run. If no external leaks can be found and all the valves are operating, the charcoal canister has most likely failed.

For many EVAP-related faults, the big cost comes from labor. EVAP systems are fairly simple to diagnose overall, so long as you have the proper understanding and diagnostic equipment. However, diagnostic time tends to build up when trying to find small EVAP system leaks. RepairPal estimates the cost of a purge valve replacement will be between $180 and $200. Considering most purge valves can be replaced with basic hand tools and parts only cost around $20 to $140, you can save some money here if you do this repair yourself.

Not every vehicle will offer a replacement vent valve or bypass valve due to them coming with a new canister. If replacement valves are offered for your vehicle, they will cost between $20 and $150. If you let the pros handle this repair, expect to pay around $150 to $300. RepairPal estimates a charcoal canister replacement will cost around $500. Some canister replacements require the fuel tank to be removed or the rear subframe lowered. This can be a challenging repair to handle without a vehicle lift. We recommend researching the location of the canister on your exact vehicle before deciding to do the repair yourself.

If your vehicle is setting the P1457 error code, you have some time before symptoms worsen or until immediate repairs are needed. However, fuel odors can be disorienting. For this reason, we recommend seeking repairs if you notice a fuel odor, specifically if it's noticeable inside the vehicle. If your vehicle exhibits the more serious symptoms such as a rough idle and engine stalling, we recommend getting it repaired immediately. Repairing the P1457 can cost anywhere from $20 to over $500. Consult your repair shop about their experience in EVAP repairs before committing to paying for long diagnostic times. If possible, don’t be afraid to handle the simple checks and repairs yourself.

Component Cost Estimates

Component

Cost Estimate

EVAP Hose

$5 - $20

Purge Valve

$20 - $140

Bypass Valve

$20 - $150

Vent Valve

$20 - $150

Charcoal Canister

$120 - $500

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