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P1245 1999 Ford F150 Code - Alternator Load Input Failed Low

Quick Answer

The P1245 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the alternator load input has failed low. Common causes include Faulty alternator, Damaged alternator load input circuit, Loose or corroded electrical connections. 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
P1245 1999 Ford F150 indicates Alternator Load Input Failed Low.
Common causes
Common causes include Faulty alternator, Damaged alternator load input circuit, Loose or corroded electrical connections.
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 P1245 1999 Ford F150 Description

The P1245 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates that the alternator load input has failed low. This means that the vehicle's powertrain control module (PCM) has detected a lower than expected voltage signal from the alternator load input circuit. The alternator load input is responsible for providing information to the PCM about the electrical load on the vehicle's charging system. When this signal is too low, it can lead to issues with the vehicle's electrical system and overall performance.

OBDII Code P1245 1999 Ford F150 - Alternator Load Input Failed Low
P1245 1999 Ford F150 Code - Alternator Load Input Failed Low

Common Causes of P1245 1999 Ford F150

  1. Faulty alternator.
  2. Damaged alternator load input circuit.
  3. Loose or corroded electrical connections.
  4. Malfunctioning PCM.

Symptoms of P1245 1999 Ford F150

  1. Dimming or flickering lights on the dashboard or exterior of the vehicle.
  2. Difficulty starting the vehicle, especially in cold weather.
  3. Battery warning light illuminated on the dashboard.
  4. Electrical accessories not functioning properly, such as power windows or radio.

How to Fix P1245 1999 Ford F150

  1. Begin by checking the alternator and alternator load input circuit for any visible damage or corrosion. Replace any damaged components.
  2. Test the alternator's output voltage to ensure it is within the manufacturer's specifications. If not, replace the alternator.
  3. Check and clean all electrical connections related to the alternator load input circuit to ensure a secure connection.
  4. Clear the DTC from the PCM's memory using a scan tool, and monitor the alternator load input signal to ensure it is functioning correctly.
  5. If the issue persists, further diagnostic testing may be required to pinpoint the exact cause of the problem.

Cost to Fix P1245 1999 Ford F150

The cost of repairing a P1245 code on a 1999 Ford F150 can vary depending on the specific cause of the issue. On average, the cost of replacing an alternator can range from $300 to $800, including parts and labor. Additional costs may be incurred if other components need to be replaced or if further diagnostic testing is required. It is recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary between different locations and types of repair facilities.

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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 P1245 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1245 in a 1999 Ford F150?

The common symptoms of OBDII code P1245 in a 1999 Ford F150 include dimming headlights, battery warning light on the dashboard, and problems with electrical components.

2. What does the OBDII code P1245 "Alternator Load Input Failed Low" mean for a 1999 Ford F150?

The code P1245 indicates that the alternator load input signal in the 1999 Ford F150 is reading lower than expected, suggesting a potential issue with the alternator or its components.

3. What are the possible causes of OBDII code P1245 in a 1999 Ford F150?

Possible causes of code P1245 in a 1999 Ford F150 include a faulty alternator, damaged wiring or connectors in the alternator circuit, or a failing battery.

4. How can I diagnose the OBDII code P1245 in my 1999 Ford F150?

To diagnose OBDII code P1245 in a 1999 Ford F150, you can perform a visual inspection of the alternator and its wiring, check the battery voltage, and use a multimeter to test the alternator output.

5. Can driving with OBDII code P1245 in a 1999 Ford F150 cause further damage?

Continuing to drive with OBDII code P1245 in a 1999 Ford F150 can potentially cause further damage to the electrical system, lead to battery drain, and result in a dead battery.

6. How do I repair OBDII code P1245 in my 1999 Ford F150?

To repair OBDII code P1245 in a 1999 Ford F150, you may need to replace the alternator, repair any damaged wiring or connectors, and ensure the battery is in good condition.

7. Can I reset the OBDII code P1245 in my 1999 Ford F150 by disconnecting the battery?

Disconnecting the battery may temporarily clear the code, but it is not a recommended method for resolving the underlying issue causing code P1245 in a 1999 Ford F150. Proper diagnosis and repair are necessary.

8. How much does it cost to fix OBDII code P1245 in a 1999 Ford F150?

The cost to fix OBDII code P1245 in a 1999 Ford F150 can vary depending on the extent of the issue and the parts and labor required. It is advisable to consult a mechanic for an accurate estimate.

9. Is it safe to drive my 1999 Ford F150 with OBDII code P1245?

It is not recommended to drive your 1999 Ford F150 with OBDII code P1245, as it can lead to potential electrical system issues and battery failure. It is best to address the problem promptly.

10. Will OBDII code P1245 in a 1999 Ford F150 cause the vehicle to stall?

While code P1245 itself may not cause the vehicle to stall, if left unresolved, it can lead to battery drainage, electrical system issues, and potentially result in stalling if the battery loses power while driving.

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