AutoCodes – Ford – P1237 2002 Ford F150

P1237 2002 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Quick Answer

Fuel Pump Driver Modules (FPDM) controls the voltage to the Fuel Pump in order to maintain proper fuel pressure over the full operating range of the engine. Common causes include Faulty Fuel Pump Driver Module (FPDM), Fuel Pump Driver Module (FPDM) harness is open or shorted, Fuel Pump Driver Module (FPDM) circuit poor electrical connection. 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 2002 Ford F150 indicates Fuel Pump Secondary Circuit Fault.
Common causes: Common causes include Faulty Fuel Pump Driver Module (FPDM), Fuel Pump Driver Module (FPDM) harness is open or shorted, Fuel Pump Driver Module (FPDM) circuit poor electrical connection.
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 3,644

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 Jul 20, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1237 2002 Ford F150 Description

Fuel Pump Driver Modules (FPDM) controls the voltage to the Fuel Pump in order to maintain proper fuel pressure over the full operating range of the engine. The P1237 code indicates the FPDM detected a fuel pump secondary circuit concern. The FPDM sends a message to the Powertrain Control Module (PCM) through the Fuel Pump Monitor (FPM) circuit indicating this concern was detected. The PCM sets the DTC when the message is received.

OBDII Code P1237 2002 Ford F150 - Fuel Pump Secondary Circuit Fault - AutoCodes.com — P1237 2002 Ford F150 Code - Fuel Pump Secondary Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P1237 2002 Ford F150?

Faulty Fuel Pump Driver Module (FPDM)
Fuel Pump Driver Module (FPDM) harness is open or shorted
Fuel Pump Driver Module (FPDM) circuit poor electrical connection
Faulty fuel pump

How to Fix the DTC P1237 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

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1237 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.

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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 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P1237 in a 2002 Ford F150?

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

2. What does the OBDII code P1237 on a 2002 Ford F150 indicate?

- The code P1237 points to a Fuel Pump Secondary Circuit Fault in the vehicle's system.

3. What are some possible causes of the P1237 code in a 2002 Ford F150?

- Potential causes may include a faulty fuel pump driver module, wiring issues, a defective fuel pump, or a problem with the fuel pump relay.

4. How can I diagnose the Fuel Pump Secondary Circuit Fault in my 2002 Ford F150?

- Diagnosis typically involves checking the fuel pump driver module, inspecting the wiring for any damage, testing the fuel pump, and verifying the operation of the fuel pump relay.

5. Is it safe to continue driving my 2002 Ford F150 with the P1237 code present?

- It is not recommended to drive the vehicle with the P1237 code, as it can lead to potential fuel delivery issues and engine performance problems.

6. Can I repair the Fuel Pump Secondary Circuit Fault in my 2002 Ford F150 myself?

- Depending on your skill level, you may be able to repair the issue yourself by addressing the specific cause of the fault, such as replacing the fuel pump driver module or fixing any wiring issues.

7. How much does it typically cost to repair the P1237 code in a 2002 Ford F150?

- The cost of repair can vary depending on the exact cause of the fault, but it may range from $200 to $800, including parts and labor.

8. Are there any preventative measures I can take to avoid the P1237 code in my 2002 Ford F150?

- Regularly maintaining your vehicle, including checking the fuel pump system and related components, can help prevent issues that could trigger the P1237 code.

9. How urgent is it to address the Fuel Pump Secondary Circuit Fault in my 2002 Ford F150?

- It is recommended to address the issue promptly to prevent potential fuel system failures and ensure the proper operation of your vehicle.

10. Can a mechanic use a scan tool to reset the OBDII code P1237 in my 2002 Ford F150?

- Resetting the code with a scan tool may temporarily clear the warning light, but it is crucial to diagnose and fix the underlying issue causing the P1237 code for a permanent solution.