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Engine-Codes – Ford – P1238 1997 Ford F150

P1238 1997 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Quick Answer

The P1238 diagnostic trouble code (DTC) for a 1997 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 driver 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
P1238 1997 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 driver 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 13, 2024
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Code P1238 1997 Ford F150 Description

The P1238 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates a Fuel Pump Secondary Circuit Fault. This code is triggered when the powertrain control module (PCM) detects an issue with the secondary circuit of the fuel pump. The fuel pump is responsible for supplying fuel from the gas tank to the engine, and any fault in its secondary circuit can lead to significant performance issues.

OBDII Code P1238 1997 Ford F150 - Fuel Pump Secondary Circuit Fault
P1238 1997 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Common Causes of P1238 1997 Ford F150

  1. Faulty fuel pump relay
  2. Damaged wiring or connectors in the fuel pump circuit
  3. Malfunctioning fuel pump driver module
  4. Defective fuel pump

Symptoms of P1238 1997 Ford F150

  1. Engine misfires
  2. Stalling or hesitation during acceleration
  3. Difficulty starting the vehicle
  4. Reduced fuel efficiency
  5. Illumination of the check engine light

How to Fix P1238 1997 Ford F150

  1. Begin by conducting a thorough inspection of the fuel pump relay, wiring, and connectors to identify any visible damage.
  2. Test the fuel pump relay using a multimeter to determine if it is functioning correctly.
  3. Check the fuel pump driver module for any signs of malfunction and replace if necessary.
  4. Test the fuel pump itself to ensure it is delivering fuel properly and replace if it is found to be defective.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1238 1997 Ford F150

The typical repair costs for a Fuel Pump Secondary Circuit Fault can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more precise estimate.

What does this mean?

Tech Notes for P1238 1997 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.

P1238 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 P1238 1997 Ford F150 Code

1. What are common symptoms of OBDII code P1238 in a 1997 Ford F150?

The common symptoms include engine stalling, no start condition, rough idle, and a lack of power during acceleration.

2. What does the OBDII code P1238 indicate in a 1997 Ford F150?

The code P1238 indicates a Fuel Pump Secondary Circuit Fault in the 1997 Ford F150, specifically related to the fuel pump control module.

3. What are the possible causes of the OBDII code P1238 in a 1997 Ford F150?

Common causes of the P1238 code include a faulty fuel pump driver module, corroded electrical connections, wiring issues, or a defective fuel pump.

4. How can I diagnose the Fuel Pump Secondary Circuit Fault in my 1997 Ford F150?

Diagnosis involves checking the fuel pump driver module for power and ground, inspecting the electrical connections for corrosion, and testing the fuel pump for proper operation.

5. Can I still drive my 1997 Ford F150 with the P1238 code present?

It is not recommended to drive the vehicle with the P1238 code active, as it can lead to engine performance issues and potential safety hazards.

6. How do I repair the Fuel Pump Secondary Circuit Fault in my 1997 Ford F150?

Repair options include replacing the fuel pump driver module, repairing or replacing corroded wiring, and ensuring proper electrical connections.

7. Is it necessary to reset the OBDII code P1238 after completing repairs on a 1997 Ford F150?

Yes, it is recommended to clear the code using an OBDII scanner after completing repairs to see if the issue has been resolved.

8. Can a DIY enthusiast fix the Fuel Pump Secondary Circuit Fault in a 1997 Ford F150?

With the right tools and knowledge, some DIY enthusiasts may be able to diagnose and repair the issue, but it is recommended to seek professional help for complex electrical issues.

9. How much does it cost to fix the P1238 code in a 1997 Ford F150?

The cost of fixing the P1238 code can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

10. Are there any preventive measures to avoid the Fuel Pump Secondary Circuit Fault in a 1997 Ford F150?

Regular maintenance, such as checking the fuel pump driver module and electrical connections for signs of wear or corrosion, can help prevent the occurrence of the P1238 code.

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