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Engine-Codes – Ford – P0231 2003 Ford F150

P0231 2003 Ford F150 Code - Fuel Pump Secondary Circuit Low

Quick Answer

The P0231 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates a problem with the fuel pump secondary circuit being low. Common causes include Faulty fuel pump relay, Damaged wiring or connectors in the fuel pump circuit, Malfunctioning fuel pump. 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 2003 Ford F150 indicates Fuel Pump Secondary Circuit Low .
Common causes
Common causes include Faulty fuel pump relay, Damaged wiring or connectors in the fuel pump circuit, Malfunctioning fuel pump.
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 17, 2024
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Code P0231 2003 Ford F150 Description

The P0231 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates a problem with the fuel pump secondary circuit being low. In simpler terms, this means that the powertrain control module (PCM) has detected a voltage level in the fuel pump secondary circuit that is below the expected range. This issue can have significant implications for the vehicle's performance and overall functionality.

OBDII Code P0231 2003 Ford F150 - Fuel Pump Secondary Circuit Low
P0231 2003 Ford F150 Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 2003 Ford F150

  1. Faulty fuel pump relay
  2. Damaged wiring or connectors in the fuel pump circuit
  3. Malfunctioning fuel pump
  4. Issues with the powertrain control module (PCM)
  5. Corrosion or poor connections in the fuel pump circuit

Symptoms of P0231 2003 Ford F150

  1. Engine misfires or hesitation during acceleration
  2. Reduced fuel efficiency
  3. Engine stalling or difficulty starting
  4. Illumination of the check engine light
  5. Rough idling or poor engine performance

How to Fix P0231 2003 Ford F150

  1. Begin by conducting a thorough inspection of the fuel pump relay, wiring, and connectors for any signs of damage or corrosion.
  2. Test the fuel pump relay using a multimeter to ensure it is functioning correctly. Replace if necessary.
  3. Check the fuel pump for proper operation and replace if it is found to be faulty.
  4. Inspect the wiring and connectors in the fuel pump circuit, repairing or replacing any damaged components.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0231 2003 Ford F150

The typical repair costs for addressing a P0231 code on a 2003 Ford F150 can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also impact the overall cost of the repair.

What does this mean?

Tech Notes for P0231 2003 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 2003 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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P0231 on a 2003 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- Common symptoms include difficulty starting the vehicle, engine stalling, and a lack of power when accelerating.

2. What are the possible causes of OBDII code P0231 on a 2003 Ford F150 indicating a Fuel Pump Secondary Circuit Low?

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

3. How can I diagnose the issue causing OBDII code P0231 on my 2003 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- You can diagnose the issue by checking the fuel pump fuse, inspecting the wiring and connectors for damage, testing the fuel pump relay, and using a multimeter to measure voltage in the circuit.

4. Can a clogged fuel filter trigger OBDII code P0231 on a 2003 Ford F150 indicating a Fuel Pump Secondary Circuit Low?

- Yes, a clogged fuel filter can restrict fuel flow to the fuel pump, causing it to work harder and potentially trigger the P0231 code.

5. What is the typical repair process for resolving OBDII code P0231 on a 2003 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- The typical repair process involves checking and replacing the fuel pump fuse, repairing any damaged wiring or connectors, testing and replacing the fuel pump relay if necessary, and inspecting the fuel pump for proper operation.

6. Is it safe to continue driving my 2003 Ford F150 with OBDII code P0231 indicating a Fuel Pump Secondary Circuit Low?

- It is not recommended to continue driving the vehicle with this code, as it can lead to fuel delivery issues and potential engine damage if left unresolved.

7. Can extreme weather conditions cause OBDII code P0231 on a 2003 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- Extreme weather conditions, such as extreme heat or cold, can potentially affect the performance of the fuel pump and trigger the P0231 code.

8. Will resetting the OBDII code P0231 on my 2003 Ford F150 fix the issue related to the Fuel Pump Secondary Circuit Low?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the P0231 code to appear.

9. How much does it typically cost to repair OBDII code P0231 on a 2003 Ford F150 indicating a Fuel Pump Secondary Circuit Low?

- The cost of repairing the P0231 code can vary depending on the specific cause, but it may range from $200 to $500 or more, including parts and labor.

10. Can a DIY enthusiast fix OBDII code P0231 on a 2003 Ford F150 related to the Fuel Pump Secondary Circuit Low?

- While some aspects of diagnosing and repairing the issue can be tackled by a DIY enthusiast, it is recommended to seek professional help for complex electrical or fuel system repairs to ensure proper resolution.

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