P0496 Code – Meaning, Causes, Symptoms (& How To Fix)

You might wonder what's going on if the Check Engine Light turns on suddenly without any symptoms. The P0496 DTC code is one such DTC. It is what exactly are you looking for and how do you get rid of it?

This guide will explain what the trouble code P0496 means. This guide will explain what causes this problem, the symptoms that might be associated with it, and how to fix it.

Definition of Code P0496

P0496 – EVAP (evaporative emission) Flow During A Non-Purge Condition

What is the P0496 Code?

All vehicles can use the P0496 general trouble code. It shows that there’s an incorrect amount of intake vacuum flow occurring in the car’s EVAP system. The codes will be applied if the vacuum exceeds what the computer considers appropriate. 

Although this code may be used with other brands, it is most prevalent with GM vehicles. Some vehicles from Acura, Honda, Hyundai, Kia, Mazda, and Kia might use a different code than what we describe. 

Trouble code P0496 Symptoms

The Check Engine Light may be the sole symptom of the P0496 code. You may not experience any performance problems or other signs that something is amiss.

You might also notice symptoms.

What causes the Code P0496?

It’s obvious that the P0496 code has everything to do with the EVAP system, but that doesn’t mean that’s where the problem is coming from, although it’s most likely.

Below are the most common causes of P0496 code:

What is the P0496 code?

Very low – You shouldn’t have any trouble driving your car with the P0496 present. However, you still don’t want to drive longer than necessary.

For starters, while the Check Engine Light is on, you won’t know if other problems occur that need your attention. The engine running too often can damage the catalytic convertor. Replacing a catalytic converter is expensive, so it’s important to repair the EVAP system as quickly as possible. 

How can you fix the code P0496?

It’s critical that you repair the P0496 code as quickly as possible, but you don’t want to just throw parts at the problem, assuming you know what’s wrong. To get the correct diagnosis, it is better to follow these steps. 

You might need to do more than what is listed here.

• Replace EVAP purge volume control valve
• Replace or secure the fuel cap 
• Change EVAP pressure sensors
• Repair leaking EVAP system
• Fix a faulty connection
• Replace charcoal canister

Common errors in P0496 diagnosis

When working with P0496 codes, the most common error mechanics make is to not properly diagnose and replace EVAP systems parts. Sometimes, it is just as easy as fixing the fuel cap.

You can ensure the easiest solution before you replace expensive parts by starting at the fuel cap. If that’s not the problem, you only spend a minute checking it and you aren’t out a lot of money. 

How do you diagnose the P0496 trouble code?

Even if you aren’t a professional mechanic, you can follow the same steps that most technicians would take. You can find the problem with the code P0496 by using a few tools and some knowledge. 

Here’s how a professional would handle it.

1. With your scanner, reset the code. To see if the code returns, drive your car briefly.
2. The fuel cap should be checked if you continue to get the problem code. Ensure it’s not cracked or missing, which is an easy fix to remedy.
3. You should check the volume control valve for purging. You may find it stuck. The engine should be turned off. Now, turn the valve that connects to the fuel tank and the purge volume control. You will also need to disconnect the connector that is attached to your valve. 
4. Start up the car and use your vacuum gauge to see what’s coming from the valve where the hose was removed. If there’s vacuum, you know there’s a leak with the valve and you must replace it. You might see another code during the test. However, you can delete it and continue to ignore it.
5. Do a leak test on your EVAP system. Pin the tube to allow venting into the control valve. Use a smoke machine or pressurize the system. You will need to fix any leaks if smoke is coming out of the seals and hoses.
6. If you can’t find any leaks, you must check the electrical wiring. The EVAP sensor wire can be checked with your multimeter. There should be a voltage change when you take the pressure sensor off of your car’s charcoal canister. You can find the correct voltage in your manual. If it’s not right, you may need to replace the EVAP pressure sensor.

It’s always possible that these steps won’t get you to the proper fix. It's possible that you need professional help. 

The estimated repair cost

After you’ve done a complete diagnostic of the system, you should know what needs to be repaired. These are approximate prices for parts and labor for top-level repairs.

• EVAP purge volume control valve – $50-$150
• Secure or replace fuel cap – $0-$25
• Replace EVAP pressure sensor – $125-$350
• Repair leaking EVAP system – $150-$750
• Repair faulty electrical connection – $50-$1,000
• Replace charcoal canister – $125-$650

The P0496 Code: Mechanics Tips

With the P0496 trouble code, it’s possible to pick up other faults with your scanner. If you have cleared the system and multiple codes return, it’s best to deal with the other ones first.

By repairing any other trouble codes, you may figure out the fault that’s causing P0496 to set. You can save time by repairing multiple problems simultaneously.

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