AutoCodes – Ford – P0231 2000 Ford F150

P0231 2000 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 2000 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 3,548

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 2000 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 2000 Ford F150 - Fuel Pump Secondary Circuit Low - AutoCodes.com — P0231 2000 Ford F150 Code - Fuel Pump Secondary Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0231 2000 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 2000 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 2000 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.

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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 2000 Ford F150 Code

1. What does the OBDII code P0231 mean on a 2000 Ford F150?

P0231 indicates a "Fuel Pump Secondary Circuit Low," meaning the voltage in the fuel pump relay's secondary circuit is lower than expected.

2. What are the common symptoms of code P0231 on a 2000 Ford F150?

Symptoms may include difficulty starting, engine stalling, poor engine performance, or a no-start condition.

3. What causes the P0231 code on a 2000 Ford F150?

Causes can include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a defective PCM (Powertrain Control Module).

4. How do I diagnose the P0231 code on my 2000 Ford F150?

Start by checking the fuel pump relay, inspecting the wiring and connectors for damage, and testing the fuel pump for proper function. Use a multimeter to measure voltage in the circuit.

5. Can a bad fuel pump cause the P0231 code?

Yes, a failing or faulty fuel pump can cause the circuit voltage to drop, triggering the P0231 code.

6. Can I drive my 2000 Ford F150 with the P0231 code?

It's not recommended to drive the vehicle as it may lead to stalling, unsafe conditions, or further damage to the fuel system.

7. How can I fix the P0231 code on a 2000 Ford F150?

Repairs may include replacing the fuel pump relay, fixing damaged wiring, replacing the fuel pump, or reprogramming/repairing the PCM if necessary.

8. What tools do I need to fix the P0231 code?

You may need a multimeter, a scan tool, a wiring diagram for your F150, and basic hand tools for repairs.

9. How much does it cost to repair the P0231 code on a 2000 Ford F150?

Repair costs can vary but typically range from $100 to $500, depending on whether the fuel pump, relay, or wiring needs replacing.

10. Can a weak battery cause the P0231 code on a 2000 Ford F150?

While unlikely, a weak battery or charging system issue could contribute to low voltage in the circuit. Itâ€™s worth checking the battery and alternator as part of the diagnosis.