P0496 OBD-II Trouble Code: EVAP Flow During a Non-Purge Condition
P0496 code definition
This is a generic code and it applies to all makes of vehicle, however, it does seem to be more prevalent in vehicles that come from GM. It means there is an issue with the purge flow in the evaporation system. Those who have Mazda, Kia, Hyundai, Honda, and Acura will find that the code’s description is slightly different. It is called EVAP system high purge flow, but it means the same thing.
What the P0496 code means
The code means that there is an undesirable amount of intake vacuum flow into the EVAP system. When the vacuum in the EVAP system is higher than the predetermined value it can cause the code to set.
What causes the P0496 code?
There are a number of potential causes for the P0496 code to appear including the following:
- Faulty purge or vent solenoid/valve
- Plugged EVAP canister
- Failed EVAP/fuel pressure sensor
- Poor electrical connections
- Bad canister purge valve
- Faulty vent solenoid
In certain vehicles, other causes could be at play. In the Hyundai vehicles, the cause can be due to a leaking EVAP system holds, while in Kia and Mazda, it could be due to a faulty purge flow sensor.
What are the symptoms of the P0496 code?
Some of the most common symptoms of a P0496 OBD-II code include the malfunction indicator light coming on in the vehicle. However, there will not likely be any other symptoms that are noticeable by the driver. In some cases, there may be issues starting the vehicle, and the engine could be “running rich”, which can cause issues with the catalytic converter and other engine components.
How does a mechanic diagnose the P0496 code?
When a mechanic has to diagnose a vehicle, he or she will utilize an OBD-II scanner connected to the vehicle’s computer. The computer will store any issues with the vehicle in trouble codes. When they see the P0496 code, they know that the vehicle potentially has a problem with the EVAP flow during non-purge conditions. To make sure that the code is accurate and was not triggered by mistake, they will then reset the code and run the vehicle. If the code comes back, they know it is a problem that they need to fix.
Common mistakes when diagnosing the P0496 code
One of the most common mistakes made during the vehicle diagnosis is believing that the problem always lies within the evaporative emission control system components. Mechanics may replace these when in actuality there is a vacuum leak present. In some cases, it might be as simple as a fuel cap that is not tightened properly. It is important to check the smaller and simpler potential solutions first and then work your way up to the larger potential replacements and repairs.
How serious is the P0496 code?
Even though there are few signs and symptoms of this type of problem in the vehicle, it is still important to get the problem fixed as soon as you are aware of it.
What repairs can fix the P0496 code?
The following are some of the potential repairs that can be utilized to fix the P0496 code.
- Utilize the scan tool to determine the code
- Reset the code and run the vehicle to see if it returns
- Check the fuel cap
- Check the purge solenoid valve, which may need replacement
- Repair or replace the fuel tank pressure sensor
Additional comments for consideration regarding the P0496 code
If this or any other issues are present in your vehicle, do not ignore them. It is best to take them into a mechanic to have them dealt with properly to make sure that the vehicle is in good condition. Ignoring problem such as this can eventually lead to other issues with the car or truck.
Need help with a P0496 code?
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