What Codes Will This Page Cover?
This page will cover the following codes:
- P0498 EVAP System Vent Valve Control Circuit Low
- P0499 EVAP System Vent Valve Control Circuit High
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What Is the P0498 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
These codes both have to do with your EVAP system. Code P0498 is defined as “EVAP System Vent Valve Control Circuit Low,” while code P0499 is “EVAP System Vent Valve Control Circuit High.” Both of these codes indicate that your vehicle’s powertrain control module (PCM) or engine control module (ECM) has identified a problem with the EVAP vent solenoid valve, but the P0498 code indicates a low circuit, and the P0499 code indicates that the circuit is high. These error codes can appear in most OBD-II-equipped vehicles with an EVAP vent valve.
You may also be interested in P1451 – EVAP Emission Control Sys Vent Control Valve Circuit
More About Error Code P0498
The evaporative emission control system also called the EVAP system, helps to trap volatile organic compounds, also called hydrocarbons, and prevent them from escaping into the atmosphere. Any part of a vehicle that contains fuel can produce hydrocarbons, as hydrocarbons are just unburnt fuel that evaporates; an improperly functioning EVAP system can release these pollutants even when the vehicle is not being operated. In a modern vehicle, this system utilizes a fuel tank filler cap with a relief valve that lets fresh air circulate within the EVAP canister. The P0498 and P0499 codes indicate a problem with this system, often indicating that the valve is venting when it doesn’t need to.
What Are the Symptoms of a P0498 Code?
The most common symptom of the P0498 and P0499 codes is that the check engine light or other service engine light will turn on. It’s very common not to see any symptoms outside of that. If you see any other issues associated with the P0498 and P0499 codes, it will usually be general rough idling and occasionally stalling. However, the EVAP system mostly deals with fuel vapors once they’re out of the engine, so these trouble codes don’t usually create drivability issues.
What Are Some Causes of a P0498 Code?
The most common cause of the P0498 and P0499 fault codes is EVAP vent valve failure. You may need to replace the emission valve assembly entirely or just a part of it. Wiring problems are also common. You may be looking at broken wires, chafed wires, issues with the wiring harness, problems with the harness connector, and broken or bent connector pins. In some very uncommon cases, PCM failure can also cause these codes, although you’ll usually see other codes logged.
How Serious Is the P0498 Code?
The EVAP canister isn’t exactly a crucial part of your vehicle, but it is important to pay attention to these emissions codes to maintain your vehicle’s safety over a long period of time. Not only can emissions issues eventually develop into a problem with drivability, but they also negatively impact the environment, so it’s important to do your part to reduce them. Plus, in most locations, you need to go through emissions testing regularly, and this code will cause your vehicle to fail an emissions test.
Can I Still Drive with a P0498 Code?
The P0498 and P0499, diagnostic trouble codes rarely result in serious enough drivability issues that you won’t be able to drive. It’s not usually an electrical issue that would result in a problem while driving, so you don’t have to pull over immediately and wait for a tow truck. However, any check engine light issue is important to fix, as clearing codes will result in a more well-functioning vehicle that will stay healthy for a long time. If possible, avoid driving unnecessarily with this code.
How Easy Is It to Diagnose a P0498 Code?
Diagnosing P0498 and P0499 codes is easier than some other code types. Your canister vent solenoid valve is an important part of vehicle functionality, but it’s not necessarily critical to the vehicle’s continued running. So you can inspect it more thoroughly without worrying about making a mistake. However, as with any code, if you see other codes associated with this code or you’re not confident in your ability to diagnose the problem, talk to an expert.
How Difficult Is It to Inspect a P0498 Code?
Understanding the inner workings of a solenoid valve control circuit is one of the primary parts of learning DIY fixes, which means that working on this vent solenoid valve control code might be the perfect way to flex your DIY skills. However, you’ll need to be prepared with information like a repair manual, freeze frame data, electrical wiring diagrams, onboard diagnosis information, and the ability to perform effective visual inspections. If this seems like too much work, you should talk to a professional mechanic.
Need Additional Help with Your P0498 Code?
Many people will end up needing help with their P0498 and P0499 codes for a variety of reasons. No matter why you’ve decided not to pursue a fix, you can find an expert willing to help you find a great solution.
To start, find an auto repair shop in your area. A local auto repair shop is a great way to get an advanced-level scan and uncover a permanent fix for this problem without going too far out of your way.
This set of codes also sometimes comes with other codes that can give even more insight into your issue. The OBD-II database at KBB.com will help you understand these codes.
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