AutoCodes – Ford – P1246 2003 Ford F150

P1246 2003 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 2003 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 3,455

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 2003 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 2003 Ford F150 - Alternator Load Input Failed - AutoCodes.com — P1246 2003 Ford F150 Code - Alternator Load Input Failed

What does this mean?

What are the Possible Causes of the DTC P1246 2003 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 2003 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 2003 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 2003 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 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.