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Engine-Codes – Ford – P0231 2002 Ford F150

P0231 2002 Ford F150 Code - Fuel Pump Secondary Circuit Low

Quick Answer

The P0231 code in a 2002 Ford F150 indicates a problem in the fuel pump secondary circuit, specifically a low voltage condition. Common causes include Faulty fuel pump relay, Damaged fuel pump, Wiring issues in the fuel pump circuit. 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 2002 Ford F150 indicates Fuel Pump Secondary Circuit Low .
Common causes
Common causes include Faulty fuel pump relay, Damaged fuel pump, Wiring issues in the fuel pump circuit.
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 11, 2024
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Code P0231 2002 Ford F150 Description

The P0231 code in a 2002 Ford F150 indicates a problem in the fuel pump secondary circuit, specifically a low voltage condition. The fuel pump secondary circuit is responsible for delivering fuel from the tank to the engine at the correct pressure. When this circuit is not functioning properly, it can lead to issues with fuel delivery, which can result in poor engine performance, reduced fuel efficiency, and potential stalling.

OBDII Code P0231 2002 Ford F150 - Fuel Pump Secondary Circuit Low
P0231 2002 Ford F150 Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 2002 Ford F150

  1. Faulty fuel pump relay
  2. Damaged fuel pump
  3. Wiring issues in the fuel pump circuit
  4. Fuel pump control module failure
  5. Poor electrical connection in the fuel pump circuit

Symptoms of P0231 2002 Ford F150

  1. Engine hesitation or stumbling during acceleration
  2. Engine misfires
  3. Difficulty starting the engine
  4. Engine stalling
  5. Reduced fuel efficiency

How to Fix P0231 2002 Ford F150

  1. Begin by inspecting the fuel pump relay and replacing it if necessary.
  2. Check the fuel pump and test its functionality; replace if it is damaged.
  3. Inspect the wiring in the fuel pump circuit for any damage or corrosion; repair or replace as needed.
  4. Test the fuel pump control module and replace if it is faulty.
  5. Clear the diagnostic trouble code from the vehicle's computer after completing the repairs and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0231 2002 Ford F150

The typical repair costs for addressing a P0231 code in a 2002 Ford F150 can vary depending on the specific cause of the issue. In general, replacing a faulty fuel pump relay can cost between $50-$100, while a new fuel pump can range from $200-$500. Wiring repairs or replacements may cost between $100-$300, and a fuel pump control module replacement can range from $150-$400. Labor costs for these repairs can vary, but on average, you can expect to pay between $200-$500 for the total repair, excluding diagnostic fees. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple shops in your area for a more precise estimate.

What does this mean?

Tech Notes for P0231 2002 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.

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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 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P0231 on a 2002 Ford F150?

- Common symptoms include difficulty starting the vehicle, engine misfires, reduced engine power, and stalling.

2. What does the OBDII code P0231 indicate on a 2002 Ford F150?

- The code P0231 indicates a problem with the fuel pump secondary circuit, specifically that the voltage is lower than normal.

3. What are some possible causes of the OBDII code P0231 on a 2002 Ford F150?

- Possible causes include a faulty fuel pump, damaged wiring or connectors in the fuel pump circuit, a blown fuse, or a malfunctioning fuel pump relay.

4. How can I diagnose the issue causing the OBDII code P0231 on my 2002 Ford F150?

- Diagnose the issue by checking the fuel pump fuse, inspecting the wiring and connectors for damage, testing the fuel pump relay, and checking the fuel pump's voltage.

5. What are the repair options for OBDII code P0231 on a 2002 Ford F150?

- Repair options include replacing the fuel pump if it is faulty, repairing or replacing damaged wiring or connectors, replacing the fuel pump relay, or resetting the code after resolving the issue.

6. Can I drive my 2002 Ford F150 with the OBDII code P0231?

- It is not recommended to drive the vehicle with code P0231 as it can lead to engine stalling and other potential safety hazards.

7. How much does it cost to repair OBDII code P0231 on a 2002 Ford F150?

- The cost of repairs can vary depending on the specific issue causing the code, but it may involve replacing the fuel pump, which can range from $300 to $800 including parts and labor.

8. Is it possible to reset the OBDII code P0231 on a 2002 Ford F150 without fixing the issue?

- While you can clear the code using an OBDII scanner, it will likely reappear until the underlying issue with the fuel pump circuit is resolved.

9. Are there any preventive maintenance tips to avoid OBDII code P0231 on a 2002 Ford F150?

- Regularly inspecting the fuel pump circuit, checking for damaged wiring, and ensuring the fuel pump relay is functioning properly can help prevent code P0231 from occurring.

10. Can a DIY enthusiast fix the OBDII code P0231 on a 2002 Ford F150?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to diagnose and repair the issue causing code P0231, such as replacing the fuel pump relay or checking for damaged wiring.

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