What is OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low?
If you’ve ever visited an auto mechanic or scanned your car for error codes, you might have come across the OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low. This type of issue can be a bit daunting for those who aren’t too familiar with car mechanics and their terminology
To put it simply, this OBD-II code is related to an issue with the fuel pump. The fuel pump is a crucial component of the vehicle’s fuel system, which pumps gasoline or diesel from the tank to the engine. In this case, the code pertains to an issue with “Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low”, which means that there’s a malfunction in the wiring or electrical system that’s responsible for powering the fuel pump.
Typically, when a fuel pump failure occurs, your car will either start up and then fail to run, or it won’t start and turn over at all. In some cases, you might be able to hear the fuel pump struggling to operate, producing a strange whining noise. If you catch the OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low early on, you may be able to save yourself a tow and costly repairs by taking care of the issue right away. If left unresolved, however, this issue could result in a complete failure of the fuel pump and damage to other components of your vehicle’s fuel system.
So, let’s dive a bit deeper into how this particular issue is caused, what are some of the symptoms one can expect from it, and how to repair it.
What Causes OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low?
As mentioned earlier, this OBD-II code is related to an issue with the electrical wiring or the circuitry of the fuel pump. In particular, this code refers to an issue with the “Compression Stroke Valve”, which is responsible for allowing fuel to be delivered to the engine during the compression stroke.
The most common cause of this issue is a failure of the fuel pump relay. Relay failure is common in vehicles that are driven frequently, and it typically occurs due to wear and tear. When the fuel pump relay fails, the circuit is broken, and the pump is unable to draw fuel from the tank and deliver it to the engine.
Another possible cause of this issue could be a problem with the fuel pump itself, specifically the wiring that connects it to the circuit. This kind of issue is less common but can be caused by things like corrosion or overheating, which can lead to damage to the wiring or the circuitry of the fuel pump.
Symptoms of OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low
If you’re experiencing issues with your vehicle’s fuel pump, then there are a few symptoms that you should look out for. Here are some of the most common ones:
1. Engine won’t start: If you’re turning the key in the ignition and the engine is not starting, then it’s a clear indication that there might be an issue with the fuel pump.
2. Sputtering or jerking: If you notice that your car is sputtering or jerking while you’re driving, especially at high speeds, then it might be a sign that there’s an issue with the fuel pump.
3. Whining noise: A strange whining noise coming from the fuel tank could be an indication that the fuel pump is struggling to operate.
4. Poor fuel efficiency: If you’re noticing that your car’s fuel efficiency has decreased, and you’re having to refill your fuel tank more frequently, then there might be an issue with the fuel pump.
5. Stalling: If your car is stalling while driving, whether at high speeds or low speeds, it’s a clear indication that there might be an issue with the fuel pump.
How to Repair OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low
Now that you know what might be causing the problem and what symptoms to look out for, let’s take a look at how the issue can be resolved.
The first step in resolving this issue is to locate the fuel pump relay. The fuel pump relay is typically located in the underhood fuse box or in the relay panel underneath the dashboard. Once you’ve located the relay, use a voltmeter to check its output. If the output is reading 0, then there’s an issue with the relay, and it needs to be replaced.
Replacing the fuel pump relay is a simple process that can be done relatively quickly. The first step is to remove the relay from its socket by gently pulling it out, then replacing it with a new one. Make sure that you’re replacing it with a manufacturer-approved relay that’s specific to your car’s make and model.
If the issue persists, then it might be time to check the wiring or circuitry related to the fuel pump. This process involves checking the electrical system for any signs of wear and tear, corrosion, or other damages. If you’re unsure of how to do this, then it’s best to seek the help of a professional mechanic.
FAQs
1. What is an OBD-II code?
OBD-II codes are error codes that are generated by the onboard diagnostics system of a vehicle. These codes are designed to help identify issues with the vehicle’s various components, including the engine, transmission, and fuel system.
2. Can I reset OBD-II codes myself?
Yes, it’s possible to reset OBD-II codes yourself, but it depends on the severity of the issue. If you’re not sure what’s causing the issue or how to resolve it, then it’s best to seek the help of a professional mechanic.
3. How often should I scan my car for error codes?
It’s recommended to scan your car’s error codes at least once every few months or after every 3,000 miles. However, if you’re experiencing any issues with your vehicle, then it’s best to scan it immediately.
4. Why is it important to resolve OBD-II codes?
Resolving OBD-II codes is crucial because they can indicate significant issues with your vehicle’s various components. Ignoring these issues can lead to further damages, costly repairs, and even safety hazards.
5. How can I prevent issues with my fuel pump?
Regular maintenance is the key to preventing issues with your fuel pump. This includes checking your fuel system for leaks, replacing fuel filters, and keeping your tank at least half full. Additionally, avoiding running your car on an empty tank can also help extend the life of your fuel pump.
Conclusion
Resolving issues with your vehicle can be a bit overwhelming, especially if you’re not too familiar with car mechanics and their terminology. However, understanding your vehicle’s error codes, such as OBD-II Code P2A85 – Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low, can make the process a bit easier. By knowing what’s causing the issue, what symptoms to look out for, and how to resolve it, you can take control of the situation and ensure that your vehicle is running smoothly. Remember to always seek the help of a professional mechanic if you’re unsure of how to resolve the issue, to avoid further damages that could lead to more significant repairs.