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P1246 1999 Ford F150 Code - Alternator Load Input Failed

Quick Answer

The P1246 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the alternator load input has failed. Common causes include Faulty alternator load input sensor, Damaged wiring or connectors in the alternator circuit, Malfunctioning powertrain control module (PCM). 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
P1246 1999 Ford F150 indicates Alternator Load Input Failed.
Common causes
Common causes include Faulty alternator load input sensor, Damaged wiring or connectors in the alternator circuit, Malfunctioning powertrain control module (PCM).
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 17, 2024
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Code P1246 1999 Ford F150 Description

The P1246 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the alternator load input has failed. This means that the vehicle's onboard computer system has detected a problem with the alternator load input signal, which is crucial for regulating the electrical system's voltage and ensuring proper charging of the battery. The alternator load input signal is used by the powertrain control module (PCM) to adjust the alternator's output based on the electrical load of the vehicle, such as when the headlights, air conditioning, or other electrical components are in use.

OBDII Code P1246 1999 Ford F150 - Alternator Load Input Failed
P1246 1999 Ford F150 Code - Alternator Load Input Failed

Common Causes of P1246 1999 Ford F150

  1. Faulty alternator load input sensor
  2. Damaged wiring or connectors in the alternator circuit
  3. Malfunctioning powertrain control module (PCM)
  4. Failing alternator

Symptoms of P1246 1999 Ford F150

  1. Dimming headlights or interior lights
  2. Battery warning light illuminated on the dashboard
  3. Difficulty starting the vehicle
  4. Electrical system malfunctions, such as power windows operating slowly
  5. Engine stalling or rough idling

How to Fix P1246 1999 Ford F150

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific DTC and checking the alternator load input sensor for proper operation.
  2. Inspect the wiring and connectors in the alternator circuit for any damage or corrosion, repairing or replacing as necessary.
  3. Test the PCM for proper function and reprogram if needed.
  4. If the alternator is found to be faulty, replace it with a new or remanufactured unit.
  5. Clear the DTC and test the vehicle to ensure the alternator load input is functioning correctly.

Cost to Fix P1246 1999 Ford F150

The typical repair costs for addressing a P1246 code on a 1999 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, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's recommended to check local rates for a more accurate estimate.

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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 P1246 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1246 on a 1999 Ford F150?

- The common symptoms include dimming lights, battery warning light on the dashboard, erratic electrical behavior, and possible charging system issues.

2. What does the OBDII code P1246 "Alternator Load Input Failed" indicate on a 1999 Ford F150?

- This code indicates a malfunction in the alternator load input circuit, affecting the vehicle's charging system.

3. What are the possible causes of OBDII code P1246 on a 1999 Ford F150?

- The possible causes include a faulty alternator, damaged wiring or connectors in the alternator load input circuit, or a defective alternator control module.

4. How can I diagnose the issue causing OBDII code P1246 on my 1999 Ford F150?

- You can start by checking the alternator's output voltage, inspecting the wiring and connectors in the alternator load input circuit, and testing the alternator control module.

5. Can I still drive my 1999 Ford F150 with OBDII code P1246 present?

- It is not recommended to drive the vehicle with this code present as it can lead to battery draining, potential stalling, or other electrical issues while driving.

6. How do I repair OBDII code P1246 on a 1999 Ford F150?

- The repair may involve replacing the alternator, repairing or replacing damaged wiring and connectors, or replacing the alternator control module as needed.

7. Is it possible to reset OBDII code P1246 on a 1999 Ford F150 without fixing the issue?

- While you can clear the code temporarily, it is essential to address the root cause of the problem to prevent further damage to the vehicle's electrical system.

8. Can a DIY enthusiast fix OBDII code P1246 on a 1999 Ford F150?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue causing this code. However, professional assistance is recommended for complex electrical repairs.

9. Will OBDII code P1246 on a 1999 Ford F150 cause permanent damage if left unresolved?

- Ignoring this code can lead to battery failure, electrical system damage, and potential stalling, which can cause further issues with the vehicle if not addressed promptly.

10. How much does it typically cost to repair OBDII code P1246 on a 1999 Ford F150?

- The cost of repairing this code can vary depending on the root cause of the issue, but it may involve expenses for parts like the alternator, wiring repairs, and labor costs for professional services.

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