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Engine-Codes – Ford – P1235 1997 Ford F150

P1235 1997 Ford F150 Code - Fuel Pump Control Out of Range

Quick Answer

The P1235 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates that the fuel pump control circuit is out of range. Common causes include Faulty wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump control module, Defective fuel pump. 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
P1235 1997 Ford F150 indicates Fuel Pump Control Out of Range.
Common causes
Common causes include Faulty wiring or connectors in the fuel pump control circuit, Malfunctioning fuel pump control module, Defective fuel pump.
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 14, 2024
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Code P1235 1997 Ford F150 Description

The P1235 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates that the fuel pump control circuit is out of range. This means that the powertrain control module (PCM) has detected a voltage signal from the fuel pump control module that is either too high or too low, indicating a malfunction in the fuel pump control system. The fuel pump control module is responsible for regulating the fuel pump's operation, ensuring that the correct amount of fuel is delivered to the engine at all times.

OBDII Code P1235 1997 Ford F150 - Fuel Pump Control Out of Range
P1235 1997 Ford F150 Code - Fuel Pump Control Out of Range

Common Causes of P1235 1997 Ford F150

  1. Faulty wiring or connectors in the fuel pump control circuit.
  2. Malfunctioning fuel pump control module.
  3. Defective fuel pump.
  4. Issues with the powertrain control module (PCM).
  5. Electrical issues such as a blown fuse or relay related to the fuel pump control system.

Symptoms of P1235 1997 Ford F150

  1. Engine hesitation or stumbling during acceleration.
  2. Difficulty starting the engine or engine stalling.
  3. Reduced fuel efficiency.
  4. Check engine light illuminated on the dashboard.
  5. Rough idling or engine misfires.

How to Fix P1235 1997 Ford F150

  1. Begin by performing a thorough inspection of the fuel pump control circuit, checking for any loose or damaged wiring or connectors. Repair or replace any faulty components as needed.
  2. Test the fuel pump control module to ensure it is functioning correctly. Replace the module if it is found to be defective.
  3. Check the fuel pump itself for proper operation. If the fuel pump is not delivering fuel as it should, replace it with a new unit.
  4. Verify that the PCM is sending and receiving the correct signals related to the fuel pump control. If necessary, reprogram or replace the PCM.
  5. Clear the diagnostic trouble codes from the PCM's memory and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1235 1997 Ford F150

The typical repair costs for addressing a P1235 code on a 1997 Ford F150 can vary depending on the specific cause of the issue. In general, replacing a faulty fuel pump control module or fuel pump can range from $200 to $600, including parts and labor. However, if the issue is related to wiring or connectors, the cost may be lower, typically around $100 to $300. It's important to note that these estimates are rough averages and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. Additionally, diagnostic time and labor rates at auto repair shops can impact the overall cost, with rates typically ranging between $80 and $150 per hour. It's recommended to consult with a qualified mechanic to obtain a more accurate estimate for addressing the P1235 code on a 1997 Ford F150.

What does this mean?

Tech Notes for P1235 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.

P1235 indicates that the FPDM has detected an invalid or missing FP circuit signal from the PCM. 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.

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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 P1235 1997 Ford F150 Code

1. What does the OBDII code P1235 mean on a 1997 Ford F150?

P1235 indicates that the Fuel Pump Driver Module (FPDM) has detected a fuel pump control signal that is out of range or abnormal.

2. What are common symptoms of the P1235 code on a 1997 Ford F150?

Symptoms include engine stalling, difficulty starting, reduced power, or the engine not starting at all.

3. What causes the P1235 code to appear on a 1997 Ford F150?

The most common causes are a faulty Fuel Pump Driver Module, wiring issues such as damaged or corroded connections, or a failing fuel pump.

4. Can a bad fuel pump trigger the P1235 code?

Yes, a failing fuel pump can cause abnormal signals to the FPDM, triggering the P1235 code.

5. How do I diagnose the P1235 code on my 1997 Ford F150?

Start by checking the wiring and connectors for the FPDM and fuel pump, test the fuel pump for proper operation, and inspect the FPDM for signs of damage or failure.

6. Can I drive my 1997 Ford F150 with the P1235 code active?

It’s not recommended, as the P1235 code can lead to engine stalling or failure to start, potentially leaving you stranded.

7. What is the Fuel Pump Driver Module (FPDM) on a 1997 Ford F150?

The FPDM is a component that regulates the voltage and operation of the fuel pump based on engine needs and driving conditions.

8. How do I fix the P1235 code on a 1997 Ford F150?

Repair steps may include replacing the FPDM, repairing damaged wiring, cleaning corroded connectors, or replacing the fuel pump if it is faulty.

9. How much does it cost to repair the P1235 code on a 1997 Ford F150?

Costs can vary, but replacing the FPDM typically ranges from $100 to $300, while replacing the fuel pump can cost $500 or more, depending on parts and labor.

10. Can a bad PCM cause the P1235 code on a 1997 Ford F150?

While rare, a malfunctioning Powertrain Control Module (PCM) can sometimes misinterpret signals and trigger this code. It’s usually the last component to check.

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