Honda Civic represents the troubles in the evaporative system through the P0497 code. Generally, this system functions to store the fuel vapor in a tank until the ignition occurs. However, malfunctioning of this system reduces the purge flow, which is responsible for the p0497 code.
P0497 Honda Civic typically occurs due to faulty or damaged purge valves, hoses, vacuum lines, and wiring. You must repair or replace these to resolve the trouble code diagnosing the exact defective components or connections.
In this article, we will enlighten you about the meaning of this trouble code and why this occurs. You will also learn the basic signs and ways to diagnose and fix this code. So, let’s go through the article without further ado.
What Does P0497 In Honda Civic Mean?
The meaning of p0497 refers to the malfunctioning of the evaporative system. Specifically, it indicates a low purge of gases and emissions of the evaporative system.
To understand this issue, you need to know about this evaporative system first. Generally, an evaporative system consists of a charcoal canister for evaporative vapor storage, hoses, a fuel tank, and a gas cap for sealing the fuel tank.
Canister stores the gas produced in the fuel tank before emitting it outside. This vapor reaches the canister through a purge valve, hoses, and tubes. This valve is known as the purge control solenoid, which is connected to the end of the hose.
Because of the voltage or pressure difference due to the powertrain control module (PCM), it will drive the vapor toward the canister. And inside the canister, there is a considerable amount of charcoal which absorbs the ambient air part and emits the residual vapor.
Sometimes, due to lack of pressure difference, it won’t be able to drive the fuel vapor when the valve is wide opened. In cases like this, a code-named p0497 will show off to represent the insufficient pressure drop in the evaporative system.
Reasons For P0497 Code In Honda Civic
When you detect this code, you shouldn’t be perplexed; instead, search for the causes. There are multiple reasons behind the frequent occurrence of this code. Those are:
- If the pressure sensor malfunctions, it won’t be able to maintain the appropriate pressure difference in the tank. As a result, the code will come out
- Sometimes, loose wiring connections of this sensor also make the circuit invalid. Thus, the sensor isn’t able to function, and the purge flow gets low
- Faulty PCM can also not maintain the proper ground pulse when a constant voltage is applied on one side of the valve via a hose. Hence, the fuel vapors lose their drivability towards the canister
- If the hoses that connect the tank and canister get damaged or worn out, the code will come up
- Sometimes, the P0497 code represents that the hose connections become loose or disconnected
- When the charcoal in the canister becomes clogged, it cannot emit the fuel vapor. This results in this error code popping up
- The damaged or cracked vent valve of the canister is also responsible for this issue. Because this faulty valve may malfunction while opening or closing, it may remain stuck closed or opened.
- If the wiring connection of this vent valve gets damaged, loose, or disconnected, it also hampers the fuel vapor flow
- When the fuel filler cap doesn’t fit well on the fuel tank, it won’t be able to prevent dirt, debris, and contaminants from getting into the tank. Eventually, these foreign materials in the fuel gas will hamper the flow
Signs Of Code P0497 In Honda Civic
Now as you know the reason, you will understand well the rest of the issues related to this code. Generally, this code comes with minor to no symptoms. In most cases, those signs are so minor that they are not even distinctive or significant. Those several signs are:
- Due to the insufficient purge flow, adequate ignition isn’t possible. Therefore, when the engine doesn’t get sufficient fuel to ignite, the check engine light keeps flashing
- Your vehicle will require more fuel than ever before. This way, the fuel economy will be pretty poor when the trouble code comes up
- Sometimes, you may hear the leaking sound of vacuum from the hoses
- When fuel gas is rapidly consumed, it will generally increase the emission of gas fumes. Therefore, you may get a gas smell from your Honda Civic
- Due to a damaged or loose hose, the fuel may leak from the system. In this case, you will also get a gas smell coming from near the meter
How To Diagnose P0497 Honda Civic?
Even though there are some minor signs of the trouble code, in most cases, you might not encounter any indications. Then, you must need professional confirmation about this trouble code.
You can also do it yourself, but you will need a service manual, voltmeter, digital diagnostic scanner tools, and smoke machine. Also, unfortunately, there are too many parts in the evaporative system, which makes the diagnosis process more complex.
Here are several diagnosing steps for P0497:
Step 1. Visual Inspection
First, you need to inspect all the harnesses and connections. There are a lot of tubing, hoses, and vacuum lines, which may become damaged, cracked or worn out. Thus, check them properly to detect any damage.
You can also use any smoke machine to make this diagnosing process easier. Mainly, professional mechanics send white smoke inside the opening of the hoses. If somehow this smoke comes out through the length of the hoses, that means the hoses have leaks or cracks.
Step 2. Charcoal Detection
This step helps in detecting issues with the canister. We already mentioned that charcoal is inside the canister, which only remains inside this canister. But, if you can detect it inside any vacuum hoses, that means the charcoal someone leaked out from the canister.
So, this circumstance represents that the canister has cracked or worn, causing this leak.
Step 3. Check The Operation Of the Purge Valve
For this step, you need to eliminate all of the stored codes and data of your Honda Civic.
- So, reset the codes again. You may need to test drive your Honda Civic for several cycles of proper ignition.
- Attach the digital diagnostic scanner tools with the purge valve to operate it.
- And run the engine and check the flow while the valve is wide open. If the valve fails, that means it’s defective.
Step 4. Checking The Circuits
Sometimes, the purge valve cannot open due to faulty wiring circuits. Thus, you need to check the wiring with the help of a service manual. There might be loose, disconnected, or shorted wires causing this problem.
Step 5. Faulty PCM
Sometimes, you may not detect any fault with the connections or components of this evaporative system. But still, if you are facing the P0497 code, that means there are issues in the PCM of your vehicle.
P0497 Honda Civic: Easy Ways To Fix
After you diagnose the responsible portion of the evaporative system for this trouble code, you need to fix this issue soon. To fix these codes, you need to follow these steps:
Tighten the loose connections and repair the damaged or cracked hoses and vacuum lines. If the damages are beyond repair, replace those parts with new ones
Replace the faulty canister to prevent the charcoal leak
If you find any open circuit, even any short circuit, remember to fix or replace those
Choose any appropriate fuel filler cap for the fuel tank which will fit properly and replace it with the ill-fitted one
Repair the cracked purge valve or replace it with a brand-new one
Remember to remove the trouble code P0497 after fixing this issue. Also, check again with the digital scanner if it’s still showing the code or not
In this FAQ section, we will answer several common questions people ask about the P0497 Honda Civic.
Q: Is It Safe To Drive When the P0497 Code Is Active On Your Honda Civic?
Generally, it’s safe to drive with the activated P0497 code as it doesn’t pose any risk of engine damage. The only demerit of driving with this code on is excess fuel consumption and emissions.
Q: Is Fixing The P0497 Code Issue in Honda Civic Costly?
The fixing cost of this issue is quite affordable. Usually, you may need to replace a few parts of the evaporative system, which come in ranges of $150-$300. If you hire a mechanic to troubleshoot this P0497 code issue, you may need to pay an extra amount of $100-$150.
P0497 Honda Civic is a pretty common issue for most Honda Civic owners. This code mainly refers to the malfunctioning of the evaporative system. This malfunction may occur for multiple reasons; you need to diagnose those reasons. Then, it will be easier for you to resolve this code issue.
Generally, this issue isn’t too severe to cause serious future troubles. But, it will increase fuel consumption which will increase the cost. Thus, though this trouble code isn’t critical, you should fix this issue with those easy steps we mentioned before.