Engine-Codes.com
Engine-Codes – Ford – P0231 2001 Ford F150

P0231 2001 Ford F150 Code - Fuel Pump Secondary Circuit Low

Quick Answer

The diagnostic trouble code P0231 for a 2001 Ford F150 indicates a Fuel Pump Secondary Circuit Low. Common causes include Faulty fuel pump relay, Damaged fuel pump, Short or open circuit in the wiring. 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 2001 Ford F150 indicates Fuel Pump Secondary Circuit Low .
Common causes
Common causes include Faulty fuel pump relay, Damaged fuel pump, Short or open circuit in the wiring.
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 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0231 2001 Ford F150 Description

The diagnostic trouble code P0231 for a 2001 Ford F150 indicates a Fuel Pump Secondary Circuit Low. This code is set when the powertrain control module (PCM) detects a low voltage condition in the secondary circuit of the fuel pump. The fuel pump secondary circuit is responsible for controlling the speed and operation of the fuel pump, which is essential for delivering fuel from the tank to the engine.

OBDII Code P0231 2001 Ford F150 - Fuel Pump Secondary Circuit Low
P0231 2001 Ford F150 Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 2001 Ford F150

  1. Faulty fuel pump relay
  2. Damaged fuel pump
  3. Short or open circuit in the wiring
  4. PCM malfunction
  5. Poor electrical connection

Symptoms of P0231 2001 Ford F150

  1. Engine hesitation or stalling
  2. Rough idle
  3. Difficulty starting the engine
  4. Reduced engine performance
  5. Check engine light illuminated

How to Fix P0231 2001 Ford F150

  1. Begin by performing a thorough inspection of the fuel pump relay, wiring, and connections to identify any visible damage.
  2. Test the fuel pump relay using a multimeter to determine if it is functioning correctly. Replace if necessary.
  3. Test the fuel pump itself to check for proper operation. If the fuel pump is faulty, it will need to be replaced.
  4. Inspect the wiring harness for any shorts or opens. Repair or replace damaged wiring as needed.
  5. Clear the trouble code from the PCM using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0231 2001 Ford F150

The cost of repairing a Fuel Pump Secondary Circuit Low issue can vary depending on the underlying cause of the problem and the specific parts that need to be replaced. On average, the cost can range from $200 to $600, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can fluctuate, so it's recommended to obtain quotes from local shops for a more accurate estimate. Additionally, the cost may be higher if the fuel pump itself needs to be replaced.

What does this mean?

Tech Notes for P0231 2001 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 2001 Ford F150 code?

Need more information on how to fix the P0231 2001 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0231 2001 Ford F150 code diagnosed by a professional: Find a repair shop in your area

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 2001 Ford F150 Code

1. What does the OBDII code P0231 mean on a 2001 Ford F150?

P0231 indicates a "Fuel Pump Secondary Circuit Low," meaning there’s a voltage issue in the circuit supplying power to the fuel pump relay.

2. What are the symptoms of code P0231 on a 2001 Ford F150?

Common symptoms include difficulty starting the engine, stalling, poor engine performance, or the engine failing to start at all.

3. What causes the P0231 code to appear on a 2001 Ford F150?

Causes may include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a blown fuse.

4. How do you diagnose a P0231 code on a 2001 Ford F150?

Check the fuel pump relay, inspect all wiring and connectors in the fuel pump circuit for damage, test the voltage and ground connections, and verify the condition of the fuel pump.

5. Can a bad fuel pump cause a P0231 code on a 2001 Ford F150?

Yes, a failing or malfunctioning fuel pump can trigger this code if it’s causing low voltage in the circuit.

6. Is it safe to drive with a P0231 code on a 2001 Ford F150?

Driving with this code is not recommended, as it may lead to engine stalling or failure to start, potentially leaving you stranded.

7. How do you fix a P0231 code on a 2001 Ford F150?

Repairs may involve replacing the fuel pump relay, repairing damaged wiring or connectors, replacing the fuel pump, or replacing a blown fuse.

8. Can a blown fuse trigger the P0231 code on a 2001 Ford F150?

Yes, a blown fuse in the fuel pump circuit can lead to low voltage and cause this code to appear.

9. How much does it cost to repair a P0231 code on a 2001 Ford F150?

Costs vary depending on the issue. Replacing a fuel pump relay or fuse may cost under $50, while replacing the fuel pump may range from $300 to $800, including labor.

10. Can a faulty PCM cause a P0231 code on a 2001 Ford F150?

While rare, a malfunctioning Powertrain Control Module (PCM) could cause this code if it fails to properly control the fuel pump relay.

Discuss the causes and fixes for P0231 2001 Ford F150 OBDII Code

Submit a New Comment

Code P0231 2001 Ford F150 comments

No comments found for this page.