AutoCodes – Ford – P0231 2002 Ford F150

P0231 2002 Ford F150 Code - Fuel Pump Secondary Circuit Low

Quick Answer

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay. 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 Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay.
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.

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Code Popularity 4,117

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 13, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0231 2002 Ford F150 Description

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. When the ignition switch is first turned ON, the ECM energizes the fuel pump relay, which applies power to the fuel pump. The ECM enables the fuel pump relay as long as the engine is cranking or running, and crankshaft reference pulses are received. If no crankshaft reference pulses are received, the ECM de-energizes the fuel pump relay after 2 seconds. The ECM monitors the voltage on the fuel pump relay control circuit.

OBDII Code P0231 2002 Ford F150 - Fuel Pump Secondary Circuit Low - AutoCodes.com — P0231 2002 Ford F150 Code - Fuel Pump Secondary Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0231 2002 Ford F150?

Blown Fuel Pump fuse
Open Fuel Pump Monitor Circuit
Faulty Fuel Pump Relay
Damaged Engine Control Module (ECM)

How to Fix the DTC P0231 2002 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0231 2002 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0231 2002 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 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.