AutoCodes – Ford – P1238 2003 Ford F150

P1238 2003 Ford F150 Code - Fuel Pump Secondary Circuit Fault

Quick Answer

This DTC indicates the Fuel Pump Driver Module (FPDM2) detected a fuel pump secondary circuit concern. 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: P1238 2003 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 2,449

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 P1238 2003 Ford F150 Description

This DTC indicates the Fuel Pump Driver Module (FPDM2) detected a fuel pump secondary circuit concern. The FPDM2 sends a message to the Powertrain Control Module (PCM) through the fuel pump monitor (FPM2) circuit, indicating this concern was detected. The PCM sets the DTC when the message is received.

OBDII Code P1238 2003 Ford F150 - Fuel Pump Secondary Circuit Fault - AutoCodes.com — P1238 2003 Ford F150 Code - Fuel Pump Secondary Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P1238 2003 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 P1238 2003 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.
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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1238 2003 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 P1238 2003 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 P1238 2003 Ford F150 Code

1. What does the OBDII code P1238 mean on a 2003 Ford F150?

P1238 indicates a Fuel Pump Secondary Circuit Fault, meaning the Powertrain Control Module (PCM) has detected an issue in the secondary circuit of the fuel pump.

2. What are the common symptoms of code P1238 on a Ford F150?

Symptoms may include difficulty starting the engine, engine stalling, reduced power, poor fuel efficiency, or the Check Engine Light illuminating.

3. What causes the P1238 code to appear on a 2003 Ford F150?

Common causes include a faulty fuel pump relay, damaged or corroded wiring, a malfunctioning fuel pump, or a problem with the PCM.

4. Can a bad fuel pump trigger the P1238 code?

Yes, a failing fuel pump can cause the code if it is not delivering adequate voltage or fuel pressure to the engine.

5. How do I diagnose the P1238 code on my Ford F150?

Start by checking the fuel pump relay, inspecting the wiring and connectors for damage or corrosion, and testing the fuel pump for proper operation. A scan tool can confirm the fault.

6. How do I fix the P1238 code on a 2003 Ford F150?

Repairs may include replacing a faulty fuel pump relay, repairing or replacing damaged wiring, replacing the fuel pump, or reprogramming or replacing the PCM if needed.

7. Can driving with the P1238 code damage my Ford F150?

Yes, continuing to drive with this code can lead to engine stalling or further damage to the fuel system, potentially leaving you stranded.

8. How much does it cost to repair the P1238 code on a Ford F150?

The cost varies depending on the issue. Replacing a fuel pump relay may cost $50-$100, while replacing the fuel pump could range from $300 to $800, including labor.

9. Can a weak battery cause the P1238 code?

A weak battery is unlikely to directly cause the P1238 code, but low voltage can affect the fuel pumpâ€™s operation, so itâ€™s worth testing the battery and charging system.

10. Is the P1238 code specific to Ford vehicles?

No, P1238 is a generic OBDII code, but the specific meaning and troubleshooting steps may vary slightly between manufacturers. For a Ford F150, it specifically refers to the fuel pump secondary circuit.