How to Fix P1243 Fuel Pump Secondary Circuit Malfunction

Introduction

If you’re experiencing the P1243 Fuel Pump Secondary Circuit Malfunction error code, it means that there’s an issue with your fuel pump’s secondary circuit. This can cause your car to stall or not start at all. Fortunately, fixing this issue is relatively simple and can be done at home with a few tools and some basic knowledge.

Step 1: Check the Fuel Pump Relay

The first thing you should do is check the fuel pump relay. This is a small device that controls the flow of electricity to the fuel pump. If the relay is faulty, it can cause the P1243 error code to appear. To check the relay, follow these steps:

1. Locate the fuel pump relay. It’s usually located in the engine compartment, near the battery.
2. Remove the relay from its socket.
3. Inspect the relay for any signs of damage or corrosion.
4. If the relay looks damaged, replace it with a new one.
5. If the relay looks fine, test it with a multimeter to ensure that it’s working correctly.

Step 2: Check the Fuel Pump Wiring

If the fuel pump relay is working correctly, the next thing you should check is the fuel pump wiring. This is the wiring that connects the fuel pump to the rest of the car’s electrical system. To check the wiring, follow these steps:

1. Locate the fuel pump wiring. It’s usually located near the fuel tank.
2. Inspect the wiring for any signs of damage or corrosion.
3. If the wiring looks damaged, repair or replace it as necessary.
4. If the wiring looks fine, test it with a multimeter to ensure that it’s working correctly.

Step 3: Check the Fuel Pump

If the fuel pump relay and wiring are both working correctly, the next thing you should check is the fuel pump itself. To check the fuel pump, follow these steps:

1. Locate the fuel pump. It’s usually located in or near the fuel tank.
2. Disconnect the fuel pump from the rest of the car’s electrical system.
3. Test the fuel pump with a multimeter to ensure that it’s working correctly.
4. If the fuel pump is faulty, replace it with a new one.

Step 4: Clear the Error Code

Once you’ve fixed the issue with your fuel pump, you’ll need to clear the P1243 error code. To do this, you’ll need an OBD-II scanner. Follow these steps:

1. Connect the OBD-II scanner to your car’s OBD-II port.
2. Turn on the scanner and follow the on-screen instructions to clear the error code.
3. Disconnect the scanner from the OBD-II port.

Conclusion

Fixing the P1243 Fuel Pump Secondary Circuit Malfunction error code is relatively simple and can be done at home with a few tools and some basic knowledge. By following the steps outlined in this article, you can diagnose and fix the issue with your fuel pump, ensuring that your car runs smoothly and reliably.

FAQs

1. Can I drive my car with the P1243 error code?

It’s not recommended to drive your car with the P1243 error code. This code indicates an issue with your fuel pump, which can cause your car to stall or not start at all.

2. How much does it cost to fix the P1243 error code?

The cost of fixing the P1243 error code will depend on the cause of the issue. If it’s a simple fix, such as replacing a faulty relay, it may only cost a few dollars. If the issue is with the fuel pump itself, it could cost several hundred dollars.

3. How can I prevent the P1243 error code from appearing again?

To prevent the P1243 error code from appearing again, it’s important to keep your fuel pump and its components in good condition. This includes regularly checking and replacing the fuel filter, using high-quality fuel, and avoiding running your car on an empty tank.