Engine-Codes.com
Engine-Codes – Ford – P0231 2011 Ford Fusion

P0231 2011 Ford Fusion Code - Fuel Pump Secondary Circuit Low

Quick Answer

The P0231 diagnostic trouble code (DTC) for a 2011 Ford Fusion indicates a problem with the fuel pump secondary circuit being low. 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 2011 Ford Fusion 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 19, 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 2011 Ford Fusion Description

The P0231 diagnostic trouble code (DTC) for a 2011 Ford Fusion indicates a problem with the fuel pump secondary circuit being low. This means that the powertrain control module (PCM) has detected a voltage signal from the fuel pump secondary circuit that is below the expected range. The fuel pump secondary circuit is responsible for providing power to the fuel pump relay, which in turn controls the fuel pump's operation. When this circuit is not functioning properly, it can lead to a variety of issues that can affect the vehicle's performance.

OBDII Code P0231 2011 Ford Fusion - Fuel Pump Secondary Circuit Low
P0231 2011 Ford Fusion Code - Fuel Pump Secondary Circuit Low

Common Causes of P0231 2011 Ford Fusion

  1. Faulty fuel pump relay.
  2. Damaged fuel pump.
  3. Wiring issues in the fuel pump circuit.
  4. PCM malfunction.
  5. Corrosion or poor connections in the fuel pump circuit.

Symptoms of P0231 2011 Ford Fusion

  1. Engine stalling or hesitation during acceleration.
  2. Difficulty starting the vehicle.
  3. Engine misfires or rough idling.
  4. Reduced fuel efficiency.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P0231 2011 Ford Fusion

  1. Begin by conducting a thorough inspection of the fuel pump relay, fuel pump, and wiring in the fuel pump circuit to identify any visible damage or issues.
  2. Test the fuel pump relay using a multimeter to determine if it is functioning correctly. Replace the relay if necessary.
  3. Test the fuel pump's operation by applying power directly to it to see if it runs. If the fuel pump does not operate, it may need to be replaced.
  4. Check the wiring in the fuel pump circuit for any signs of damage, corrosion, or poor connections. Repair or replace any damaged wiring.
  5. If all components check out and the issue persists, further diagnostics may be needed to determine if the PCM is at fault. Consult a professional mechanic for advanced troubleshooting.

Cost to Fix P0231 2011 Ford Fusion

The typical repair costs for addressing a P0231 code in a 2011 Ford Fusion can vary depending on the specific cause of the issue. In general, replacing a faulty fuel pump relay can cost between $50 and $150, while a new fuel pump can range from $100 to $300. Labor costs for these repairs can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It's important to note that these are rough estimates, and actual costs may vary based on location, vehicle make and model, and other factors. It's recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.

What does this mean?

Tech Notes for P0231 2011 Ford Fusion

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.

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 2011 Ford Fusion code?

Need more information on how to fix the P0231 2011 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0231 2011 Ford Fusion 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 2011 Ford Fusion Code

1. What does the OBDII code P0231 mean for a 2011 Ford Fusion?

The P0231 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the fuel pump secondary circuit.

2. What are the common symptoms of the P0231 code in a Ford Fusion?

Symptoms include difficulty starting the engine, stalling, poor engine performance, and the Check Engine Light being illuminated.

3. What causes the P0231 code to appear in a 2011 Ford Fusion?

Common causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, or a failing fuel pump.

4. Can a faulty fuel pump cause the P0231 code?

Yes, a failing or malfunctioning fuel pump can cause low voltage in the secondary circuit, triggering the P0231 code.

5. How do I diagnose the P0231 code in my Ford Fusion?

Start by inspecting the wiring and connectors in the fuel pump circuit for damage or corrosion. Then, test the fuel pump relay and fuel pump for proper operation.

6. Is the P0231 code safe to ignore?

No, ignoring the P0231 code can lead to engine performance issues, stalling, or difficulty starting, potentially leaving you stranded.

7. How can I fix the P0231 code on a 2011 Ford Fusion?

Repairs may involve replacing a faulty fuel pump relay, repairing damaged wiring or connectors, or replacing the fuel pump if it’s defective.

8. Can a blown fuse cause the P0231 code?

Yes, a blown fuel pump fuse can interrupt the circuit and result in low voltage, triggering the P0231 code.

9. How much does it cost to fix a P0231 code on a Ford Fusion?

The cost varies depending on the repair, but replacing a fuel pump relay typically costs $50–$150, while a fuel pump replacement can range from $300–$700.

10. Can a weak battery cause the P0231 code?

While unlikely, a weak or failing battery can contribute to electrical issues and should be tested to rule out any contributing factors.

Discuss the causes and fixes for P0231 2011 Ford Fusion OBDII Code

Submit a New Comment

Code P0231 2011 Ford Fusion comments

No comments found for this page.