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P1246 2003 Ford F150 Code - Alternator Load Input Failed

Quick Answer

The P1246 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates that the alternator load input has failed. Common causes include Faulty alternator, Damaged wiring or connectors in the alternator circuit, Defective alternator load input sensor. 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 2003 Ford F150 indicates Alternator Load Input Failed.
Common causes
Common causes include Faulty alternator, Damaged wiring or connectors in the alternator circuit, Defective alternator load input sensor.
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 2003 Ford F150 Description

The P1246 diagnostic trouble code (DTC) for a 2003 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's ability to provide the necessary electrical power to the vehicle's systems. The alternator is responsible for generating electricity to power the vehicle's electrical components and recharge the battery while the engine is running. When the alternator load input fails, it can lead to various issues with the vehicle's electrical system, affecting its overall performance and reliability.

OBDII Code P1246 2003 Ford F150 - Alternator Load Input Failed
P1246 2003 Ford F150 Code - Alternator Load Input Failed

Common Causes of P1246 2003 Ford F150

  1. Faulty alternator.
  2. Damaged wiring or connectors in the alternator circuit.
  3. Defective alternator load input sensor.
  4. Issues with the vehicle's computer system monitoring the alternator.

Symptoms of P1246 2003 Ford F150

  1. Dimming or flickering lights on the dashboard or exterior of the vehicle.
  2. Battery warning light illuminated on the dashboard.
  3. Difficulty starting the vehicle or frequent battery drain.
  4. Electrical components not functioning properly, such as power windows or radio.
  5. Engine stalling or running rough due to lack of electrical power.

How to Fix P1246 2003 Ford F150

  1. Perform a thorough inspection of the alternator, wiring, and connectors to identify any visible damage or issues.
  2. Test the alternator load input sensor to determine if it is functioning correctly.
  3. Check the vehicle's computer system for any error codes related to the alternator load input failure.
  4. Replace the alternator if it is found to be faulty, and repair or replace any damaged wiring or connectors.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1246 2003 Ford F150

The typical repair costs for addressing a P1246 code on a 2003 Ford F150 can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, the cost of replacing an alternator can range from $300 to $800, including parts and labor. Additional costs may apply if there are other components that need to be repaired or replaced. It is advisable to consult with a qualified mechanic or auto repair shop to obtain an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary between different repair shops, so it is recommended to inquire about rates in your local area for a more precise cost 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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P1246 on a 2003 Ford F150?

- Common symptoms include dimming headlights, weak battery, and potential stalling or rough idling of the vehicle.

2. What does the OBDII code P1246 "Alternator Load Input Failed" mean for a 2003 Ford F150?

- This code indicates a fault in the alternator load input circuit, which may lead to issues with the vehicle's charging system.

3. What are the possible causes of OBDII code P1246 on a 2003 Ford F150?

- Possible causes include a faulty alternator, damaged wiring or connectors in the load input circuit, or a defective battery.

4. How can I diagnose the OBDII code P1246 on my 2003 Ford F150?

- You can diagnose this code by checking the alternator output voltage, inspecting the wiring and connectors in the load input circuit, and testing the battery.

5. What are some repair tips for fixing OBDII code P1246 on a 2003 Ford F150?

- Repair tips include replacing a faulty alternator, repairing any damaged wiring or connectors, and ensuring the battery is in good condition.

6. Can I drive my 2003 Ford F150 with OBDII code P1246 "Alternator Load Input Failed"?

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

7. How much does it cost to repair OBDII code P1246 on a 2003 Ford F150?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing the alternator, repairing wiring, or getting a new battery.

8. Will resetting the OBDII code P1246 on my 2003 Ford F150 make the issue go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the "Alternator Load Input Failed" issue.

9. Can a DIY enthusiast fix OBDII code P1246 on a 2003 Ford F150?

- Depending on the skill level and tools available, a DIY enthusiast may be able to diagnose and repair this code, especially if the issue is related to wiring or connectors.

10. How often does OBDII code P1246 occur in 2003 Ford F150 vehicles?

- While not extremely common, this code can occur in 2003 Ford F150 vehicles, especially as they age and components like the alternator or wiring start to wear out.

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