AutoCodes – Ford – P1246 1999 Ford F150

P1246 1999 Ford F150 Code - Alternator Load Input Failed

Quick Answer

The Powertrain Control Module (PCM) monitors generator load from the generator/regulator in the form of frequency. Common causes include Faulty Alternator/Generator, Alternator/Generator harness is open or shorted, Alternator/Generator circuit 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: P1246 1999 Ford F150 indicates Alternator Load Input Failed.
Common causes: Common causes include Faulty Alternator/Generator, Alternator/Generator harness is open or shorted, Alternator/Generator circuit 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 Popularity 2,313

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1246 1999 Ford F150 Description

The Powertrain Control Module (PCM) monitors generator load from the generator/regulator in the form of frequency. The frequency range is determined by the temperature of the voltage regulator where 97% represents full load, below 6% means no load.

OBDII Code P1246 1999 Ford F150 - Alternator Load Input Failed - AutoCodes.com — P1246 1999 Ford F150 Code - Alternator Load Input Failed

What does this mean?

What are the Possible Causes of the DTC P1246 1999 Ford F150?

Faulty Alternator/Generator
Alternator/Generator harness is open or shorted
Alternator/Generator circuit poor electrical connection
Damaged Powertrain Control Module (PCM)

How to Fix the DTC P1246 1999 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1246 1999 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1246 1999 Ford F150 code?

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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.