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P1235 2002 Ford F150 Code - Fuel Pump Control Out of Range

Quick Answer

The P1235 diagnostic trouble code (DTC) for a 2002 Ford F150 indicates that the fuel pump control circuit is out of range. Common causes include Faulty fuel pump control module, Wiring issues or loose connections in the fuel pump circuit, Malfunctioning 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 2002 Ford F150 indicates Fuel Pump Control Out of Range.
Common causes
Common causes include Faulty fuel pump control module, Wiring issues or loose connections in the fuel pump circuit, Malfunctioning 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 12, 2024
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Code P1235 2002 Ford F150 Description

The P1235 diagnostic trouble code (DTC) for a 2002 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 not within the expected range. 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. When this control module malfunctions or sends incorrect signals, it can lead to various issues with the fuel delivery system.

OBDII Code P1235 2002 Ford F150 - Fuel Pump Control Out of Range
P1235 2002 Ford F150 Code - Fuel Pump Control Out of Range

Common Causes of P1235 2002 Ford F150

  1. Faulty fuel pump control module.
  2. Wiring issues or loose connections in the fuel pump circuit.
  3. Malfunctioning fuel pump.
  4. PCM failure or software issues.
  5. Fuel pressure regulator problems.

Symptoms of P1235 2002 Ford F150

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

How to Fix P1235 2002 Ford F150

  1. Begin by conducting a thorough inspection of the fuel pump control module, wiring, and connections for any visible damage or loose connections.
  2. Test the fuel pump control module and fuel pump to ensure they are functioning correctly using a multimeter or scan tool.
  3. Replace any faulty components, such as the fuel pump control module, fuel pump, or wiring harness, as needed.
  4. Clear the DTC from the PCM memory using a scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the issue, such as checking fuel pressure and injector operation.

Cost to Fix P1235 2002 Ford F150

The typical repair costs for addressing a P1235 code on a 2002 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 additional diagnosis or repairs are needed, the total cost could increase. It's important to note that labor rates at auto repair shops can vary, typically ranging between $80 and $150 per hour. Factors such as location, vehicle make and model, and engine type can also impact the final repair costs. To obtain a more accurate estimate, it's recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for P1235 2002 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 2002 Ford F150 Code

1. What does the OBDII code P1235 mean for a 2002 Ford F150?

The P1235 code indicates that the Powertrain Control Module (PCM) has detected the fuel pump control circuit is operating out of its expected range.

2. What are common symptoms of the P1235 code in a 2002 Ford F150?

Symptoms include engine stalling, rough idling, hesitation during acceleration, and difficulty starting the engine.

3. What causes the P1235 code to appear on a 2002 Ford F150?

Common causes include a faulty fuel pump driver module, damaged wiring or connectors in the fuel pump circuit, or a failing fuel pump.

4. How can I diagnose the P1235 code on my Ford F150?

Start by inspecting the fuel pump driver module for damage or corrosion, checking wiring and connectors for continuity issues, and testing the fuel pump for proper operation.

5. Can a bad fuel pump driver module trigger the P1235 code?

Yes, a faulty fuel pump driver module is a frequent cause of this code and should be inspected or replaced if necessary.

6. Is it safe to drive with the P1235 code on a 2002 Ford F150?

Driving with this code is not recommended, as it can lead to engine stalling or failure, which could be unsafe.

7. How do I fix the P1235 code on a 2002 Ford F150?

Repairs may include replacing the fuel pump driver module, repairing damaged wiring or connectors, or replacing the fuel pump if it’s defective.

8. Where is the fuel pump driver module located on a 2002 Ford F150?

The fuel pump driver module is typically located near the rear of the vehicle, above the spare tire or on the frame rail.

9. Will clearing the P1235 code fix the issue?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

10. How much does it cost to repair the P1235 code on a 2002 Ford F150?

Repair costs vary but typically range from $100 to $500, depending on whether the issue is with the fuel pump driver module, wiring, or the fuel pump itself.

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