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P1237 1998 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Quick Answer

The P1237 diagnostic trouble code (DTC) for a 1998 Ford F150 indicates a fuel pump secondary circuit fault. Common causes include Faulty fuel pump relay, Damaged wiring or connectors in the fuel pump circuit, Malfunctioning fuel pump control module. 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
P1237 1998 Ford F150 indicates Fuel Pump Secondary Circuit Fault.
Common causes
Common causes include Faulty fuel pump relay, Damaged wiring or connectors in the fuel pump circuit, Malfunctioning fuel pump control module.
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 15, 2024
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Code P1237 1998 Ford F150 Description

The P1237 diagnostic trouble code (DTC) for a 1998 Ford F150 indicates a fuel pump secondary circuit fault. This means that there is an issue with the electrical circuit that controls the fuel pump's operation. The fuel pump is responsible for delivering fuel from the tank to the engine, and any malfunction in its circuit can lead to a variety of performance issues.

OBDII Code P1237 1998 Ford F150 - Fuel Pump Secondary Circuit Fault
P1237 1998 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Common Causes of P1237 1998 Ford F150

  1. Faulty fuel pump relay
  2. Damaged wiring or connectors in the fuel pump circuit
  3. Malfunctioning fuel pump control module
  4. Defective fuel pump
  5. Corrosion or contamination in the fuel pump circuit

Symptoms of P1237 1998 Ford F150

  1. Hard starting or difficulty starting the engine
  2. Engine stalling or hesitation during acceleration
  3. Reduced fuel efficiency
  4. Engine misfires or rough idling
  5. Complete engine failure

How to Fix P1237 1998 Ford F150

  1. Begin by conducting a thorough inspection of the fuel pump circuit, including the relay, wiring, connectors, and control module.
  2. Test the fuel pump relay to determine if it is functioning correctly. Replace it if necessary.
  3. Check for any damaged or corroded wiring and connectors in the fuel pump circuit and repair or replace them as needed.
  4. Test the fuel pump control module for proper operation and replace it if it is faulty.
  5. If the fuel pump itself is determined to be defective, replace it with a new one.

Cost to Fix P1237 1998 Ford F150

The typical repair costs for a fuel pump secondary circuit fault can range from $200 to $600, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Auto repair shops commonly charge between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops.

What does this mean?

Tech Notes for P1237 1998 Ford F150

Note: For LS6/LS8 and Thunderbird, the FPDM functions are incorporated in the Rear Electronics Module (REM). Also, the REM does not use an FPM circuit. Diagnostic information is sent on the communication link.

P1237 indicates that the FPDM has detected a fuel pump secondary circuit fault. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received.

When is the Code Detected?

Fuel pump driver module has detected a fault in the fuel pump secondary circuit

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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 P1237 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P1237 in a 1998 Ford F150?

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

2. What causes the OBDII code P1237 Fuel Pump Secondary Circuit Fault in a 1998 Ford F150?

- This code is typically triggered by issues with the fuel pump driver module, wiring faults, or a malfunctioning fuel pump.

3. How can I diagnose the Fuel Pump Secondary Circuit Fault in my 1998 Ford F150?

- You can use a scan tool to retrieve the trouble code and perform tests on the fuel pump driver module, wiring, and fuel pump to identify the root cause.

4. Is it safe to continue driving my 1998 Ford F150 with OBDII code P1237 active?

- It is not recommended to drive the vehicle with this code active as it can lead to further damage to the fuel system and potential safety hazards.

5. Can a DIY enthusiast repair the Fuel Pump Secondary Circuit Fault in a 1998 Ford F150?

- While some may attempt to repair this issue themselves, it is recommended to have a qualified mechanic diagnose and fix the problem due to the complexity of the fuel system.

6. How much does it cost to repair OBDII code P1237 in a 1998 Ford F150?

- The cost of repairing this code can vary depending on the root cause, but it typically ranges from $300 to $800 including parts and labor.

7. Are there any preventive measures to avoid triggering the Fuel Pump Secondary Circuit Fault in a 1998 Ford F150?

- Regular vehicle maintenance, including checking the fuel pump and related components, can help prevent issues that may lead to this fault code.

8. Can a faulty fuel pump driver module be repaired, or does it need to be replaced?

- In most cases, a faulty fuel pump driver module will need to be replaced rather than repaired to ensure proper functioning of the fuel system.

9. Will resetting the OBDII code P1237 in a 1998 Ford F150 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

10. How long does it take to repair OBDII code P1237 Fuel Pump Secondary Circuit Fault in a 1998 Ford F150?

- The repair time can vary depending on the exact cause of the issue, but it typically takes a few hours to a full day for a mechanic to diagnose and fix the problem.

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