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Engine-Codes – Ford – P1235 1998 Ford F150

P1235 1998 Ford F150 Code - Fuel Pump Control Out of Range

Quick Answer

The P1235 diagnostic trouble code (DTC) for a 1998 Ford F150 indicates that the fuel pump control circuit is out of range. Common causes include Faulty fuel pump control module, Damaged wiring harness, 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
P1235 1998 Ford F150 indicates Fuel Pump Control Out of Range.
Common causes
Common causes include Faulty fuel pump control module, Damaged wiring harness, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 27, 2024
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Code P1235 1998 Ford F150 Description

The P1235 diagnostic trouble code (DTC) for a 1998 Ford F150 indicates that the fuel pump control circuit is out of range. This means that the Engine Control Module (ECM) 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.

OBDII Code P1235 1998 Ford F150 - Fuel Pump Control Out of Range
P1235 1998 Ford F150 Code - Fuel Pump Control Out of Range

Common Causes of P1235 1998 Ford F150

  1. Faulty fuel pump control module.
  2. Damaged wiring harness.
  3. Poor electrical connection.
  4. Malfunctioning ECM.
  5. Corrosion or debris in the fuel pump control circuit.

Symptoms of P1235 1998 Ford F150

  1. Engine hesitation or lack of power during acceleration.
  2. Rough idling or stalling.
  3. Decreased fuel efficiency.
  4. Engine flooding.
  5. Engine fails to start.

How to Fix P1235 1998 Ford F150

  1. Begin by performing a thorough inspection of the fuel pump control module, wiring harness, and electrical connections for any visible damage or corrosion.
  2. Use a multimeter to test the voltage signal from the fuel pump control module to the ECM to determine if it falls within the expected range.
  3. If the voltage signal is out of range, replace the fuel pump control module and retest the system.
  4. Clear the DTC using a scan tool and test drive the vehicle to ensure that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be necessary to identify any underlying issues with the fuel pump or ECM.

Cost to Fix P1235 1998 Ford F150

The typical repair costs for addressing a P1235 code on a 1998 Ford F150 can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor. Rates may be higher in metropolitan areas or at dealerships, while independent shops often offer lower rates. It's recommended to obtain local estimates for a more accurate cost assessment.

What does this mean?

Tech Notes for P1235 1998 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 1998 Ford F150 Code

1. What does the OBDII code P1235 mean on a 1998 Ford F150?

P1235 indicates a "Fuel Pump Control Out of Range" issue, meaning there’s a problem with the fuel pump driver module or its circuit.

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

Common symptoms include engine stalling, difficulty starting, reduced power, poor fuel efficiency, or the engine not starting at all.

3. What causes the P1235 code to appear on a 1998 Ford F150?

Causes may include a faulty fuel pump driver module, damaged wiring or connections, a failing fuel pump, or a malfunctioning powertrain control module (PCM).

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

Start by inspecting the fuel pump driver module and its wiring for damage, corrosion, or loose connections. Use a multimeter to check for proper voltage and consult a service manual for specific test procedures.

5. Can a faulty fuel pump trigger the P1235 code?

Yes, a failing fuel pump can cause the fuel pump control system to go out of range, leading to the P1235 code.

6. Is the P1235 code specific to the fuel pump driver module?

Not always. While the fuel pump driver module is a common culprit, the issue could also stem from wiring faults, a failing fuel pump, or problems with the PCM.

7. How do I fix the P1235 code on a 1998 Ford F150?

Repairs may include replacing the fuel pump driver module, repairing damaged wiring, replacing the fuel pump, or reprogramming or replacing the PCM if necessary.

8. Can I still drive my 1998 Ford F150 with a P1235 code?

It’s not recommended, as the code may indicate a fuel delivery issue that could lead to engine stalling or failure to start, potentially leaving you stranded.

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

Repair costs vary depending on the issue. Replacing the fuel pump driver module typically costs $100-$300 for parts and labor, while a fuel pump replacement could cost $400-$800.

10. Do I need a professional mechanic to fix the P1235 code?

If you’re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it yourself. However, if the issue requires advanced testing or PCM reprogramming, consulting a professional is recommended.

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