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Engine-Codes – Ford – P0231 1998 Ford F150

P0231 1998 Ford F150 Code - Fuel Pump Secondary Circuit Low

Quick Answer

The diagnostic trouble code P0231 in a 1998 Ford F150 indicates a problem with the fuel pump secondary circuit being low. Common causes include Faulty fuel pump relay, Wiring issues such as a short circuit or open circuit, Corrosion or poor connection in the electrical system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0231 1998 Ford F150 indicates Fuel Pump Secondary Circuit Low .
Common causes
Common causes include Faulty fuel pump relay, Wiring issues such as a short circuit or open circuit, Corrosion or poor connection in the electrical system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0231 1998 Ford F150 Description

The diagnostic trouble code P0231 in a 1998 Ford F150 indicates a problem with the fuel pump secondary circuit being low. In simpler terms, this means that the fuel pump is not receiving the proper amount of voltage from the vehicle's electrical system. The fuel pump is responsible for delivering fuel from the gas tank to the engine, and if it is not receiving enough power, it can lead to various performance issues and potentially cause the vehicle to stall.

OBDII Code P0231 1998 Ford F150 - Fuel Pump Secondary Circuit Low
P0231 1998 Ford F150 Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 1998 Ford F150

  1. Faulty fuel pump relay
  2. Wiring issues such as a short circuit or open circuit
  3. Corrosion or poor connection in the electrical system
  4. Defective fuel pump
  5. Issues with the powertrain control module (PCM)

Symptoms of P0231 1998 Ford F150

  1. Engine misfires or hesitations
  2. Difficulty starting the vehicle
  3. Engine stalling or cutting out while driving
  4. Reduced fuel efficiency
  5. Check engine light illuminated on the dashboard

How to Fix P0231 1998 Ford F150

  1. Begin by checking the fuel pump relay to ensure it is functioning properly. If the relay is faulty, replace it with a new one.
  2. Inspect the wiring connected to the fuel pump for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wires.
  3. Test the fuel pump itself to determine if it is functioning correctly. If the fuel pump is defective, it will need to be replaced.
  4. Check the powertrain control module (PCM) to ensure it is sending the proper signals to the fuel pump. If the PCM is faulty, it may need to be reprogrammed or replaced.
  5. Clear the diagnostic trouble code from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0231 1998 Ford F150

The typical repair costs for addressing a fuel pump secondary circuit low issue in a 1998 Ford F150 can range from $200 to $600, depending on the specific cause of the problem and the cost of parts and labor in your area. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as the vehicle make and model, as well as the engine type, can also impact the overall repair costs.

What does this mean?

Tech Notes for P0231 1998 Ford F150

For some FORD models:

1. Disconnect the inertia switch harness connector

2. Turn key to ON position (Engine OFF)

3. Measure voltage of circuit between inertia switch harness connector and ground

4. If battery voltage is found, replaced Inertia Switch

5. Clear codes



For natural gas applications, the following description applies to the fuel shutoff valve monitor (FSVM) and the fuel shutoff valve power (FSV PWR) circuits.

The PCM monitors the fuel pump monitor (FPM) circuit. The test fails if the PCM commands the fuel pump ON and B+ voltage is not detected on the FPM circuit.

When is the Code Detected?

The code will be set if a low voltage on the control circuit of the fuel pump relay is detected by the ECM.

Need more information about the P0231 1998 Ford F150 code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0231 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P0231 in a 1998 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- Common symptoms include engine stalling, difficulty starting the vehicle, loss of power while driving, and a malfunctioning fuel pump.

2. What are the possible causes of OBDII code P0231 in a 1998 Ford F150?

- The code P0231 on a 1998 Ford F150 could be triggered by a faulty fuel pump relay, a damaged fuel pump, wiring issues, or a problem with the fuel pump driver module.

3. How can I diagnose the cause of OBDII code P0231 in my 1998 Ford F150?

- To diagnose the issue, you can check the fuel pump relay, inspect the fuel pump for proper function, test the wiring for any shorts or breaks, and verify the fuel pump driver module is functioning correctly.

4. What are the repair options for fixing OBDII code P0231 in a 1998 Ford F150?

- Repair options include replacing the fuel pump relay, replacing the fuel pump if it is faulty, repairing any damaged wiring, or replacing the fuel pump driver module if needed.

5. Can a DIY enthusiast fix OBDII code P0231 in a 1998 Ford F150?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to fix the issue by following repair guides or tutorials specific to the Ford F150 model.

6. Is it safe to continue driving with OBDII code P0231 in a 1998 Ford F150?

- It is not recommended to continue driving with code P0231 as it can lead to potential fuel delivery issues, engine stalling, and other safety concerns. It is best to address the problem promptly.

7. How much does it cost to repair OBDII code P0231 in a 1998 Ford F150?

- The cost of repairing code P0231 can vary depending on the exact cause of the issue, but it may range from around $200 to $800, including parts and labor.

8. Can a bad fuel filter cause OBDII code P0231 in a 1998 Ford F150?

- While a clogged fuel filter can restrict fuel flow and lead to fuel pump issues, a bad fuel filter itself is not a common cause of OBDII code P0231 specifically related to the fuel pump circuit.

9. Will resetting the OBDII code P0231 in a 1998 Ford F150 make the problem go away?

- Resetting the code may temporarily clear the check engine light, but it will not fix the underlying issue causing code P0231. It is important to diagnose and repair the root cause of the problem.

10. How long does it typically take to repair OBDII code P0231 in a 1998 Ford F150?

- The repair time can vary based on the specific cause of the issue and the expertise of the mechanic, but it may take anywhere from a few hours to a full day to address and fix code P0231.

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