P1235 1999 Ford F150 Code - Fuel Pump Control Out of Range
Quick Answer
The P1235 diagnostic trouble code (DTC) for a 1999 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 1999 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.
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Code P1235 1999 Ford F150 Description
The P1235 diagnostic trouble code (DTC) for a 1999 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 outside of the expected range. The fuel pump control module is responsible for regulating the fuel pump operation, ensuring that the correct amount of fuel is delivered to the engine at all times.
Common Causes of P1235 1999 Ford F150
- Faulty fuel pump control module
- Damaged wiring harness
- Poor electrical connection
- Malfunctioning PCM
- Clogged fuel filter
Symptoms of P1235 1999 Ford F150
- Engine misfires or hesitation during acceleration
- Difficulty starting the engine
- Reduced fuel efficiency
- Engine stalling or shutting off unexpectedly
- Illumination of the check engine light
How to Fix P1235 1999 Ford F150
- Begin by conducting a thorough inspection of the fuel pump control module, wiring harness, and electrical connections to identify any visible damage or issues.
- Test the fuel pump control module using a multimeter to check for proper voltage signals and continuity.
- If the fuel pump control module is faulty, replace it with a new unit and ensure proper installation.
- Check and replace the wiring harness if any damage is found, ensuring secure connections.
- Clear the DTC from the PCM memory using a diagnostic scan tool and test drive the vehicle to confirm that the issue has been resolved.
Cost to Fix P1235 1999 Ford F150
The typical repair costs for addressing a P1235 code on a 1999 Ford F150 can range from $200 to $500, including parts and labor. However, it is 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, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It is recommended to obtain local estimates for a more accurate cost assessment.
Tech Notes for P1235 1999 Ford F150
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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Frequently Asked Questions about P1235 1999 Ford F150 Code
1. What does the OBDII code P1235 mean on a 1999 Ford F150?
P1235 indicates that the Fuel Pump Driver Module (FPDM) has detected an out-of-range signal or malfunction in the fuel pump circuit.
2. What are the symptoms of code P1235 in a 1999 Ford F150?
Common symptoms include difficulty starting, engine stalling, poor acceleration, low fuel pressure, and the Check Engine Light turning on.
3. What causes the P1235 code to appear?
The code can be triggered by a faulty Fuel Pump Driver Module (FPDM), wiring issues (damaged or corroded wires), a failing fuel pump, or a defective Powertrain Control Module (PCM).
4. Can I drive my 1999 Ford F150 with code P1235?
Driving with this code is not recommended, as it may lead to poor engine performance or complete stalling, leaving you stranded.
5. How do I fix the P1235 code on a 1999 Ford F150?
Inspect the FPDM and its wiring for damage or corrosion, repair or replace the wiring if needed, and replace the FPDM or fuel pump if they are faulty.
6. Where is the Fuel Pump Driver Module located on a 1999 Ford F150?
The FPDM is typically located near the rear of the vehicle, often mounted on the frame rail close to the fuel tank.
7. Can a bad fuel pump cause the P1235 code?
Yes, a failing fuel pump can cause the FPDM to detect an out-of-range signal, triggering the P1235 code.
8. How do I test the Fuel Pump Driver Module (FPDM) for the P1235 code?
You can use a multimeter to check for proper voltage and continuity in the FPDM wiring. If the wiring is intact, the FPDM itself may need to be tested or replaced.
9. Will clearing the P1235 code fix the issue?
Clearing the code will reset the Check Engine Light temporarily, but the underlying problem must be resolved to prevent the code from returning.
10. What tools are needed to diagnose the P1235 code?
You'll need an OBDII scanner, a multimeter for electrical testing, and possibly a fuel pressure gauge to assess the fuel pump's performance.
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