AutoCodes – Ford – P1246 2002 Ford F150

P1246 2002 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 2002 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 3,267

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 2002 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 2002 Ford F150 - Alternator Load Input Failed - AutoCodes.com — P1246 2002 Ford F150 Code - Alternator Load Input Failed

What does this mean?

What are the Possible Causes of the DTC P1246 2002 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 2002 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 2002 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.

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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 2002 Ford F150 Code

1. What does the OBDII code P1246 mean on a 2002 Ford F150?

The P1246 code indicates that the Powertrain Control Module (PCM) has detected a failure in the Alternator Load Input, meaning the alternator is not communicating its load signal properly.

2. What are the symptoms of a P1246 code on a 2002 Ford F150?

Common symptoms include a battery warning light on the dashboard, charging system issues, dim headlights, electrical malfunctions, or a dead battery.

3. What causes the P1246 code to appear on a 2002 Ford F150?

Causes include a faulty alternator, damaged wiring or connectors in the alternator circuit, a defective PCM, or issues with the alternator's load sensing mechanism.

4. Can I drive my 2002 Ford F150 with a P1246 code?

Driving with this code is not recommended as it could lead to battery drain, loss of power to electrical systems, or vehicle stalling due to charging system failure.

5. How do I diagnose the P1246 code on a 2002 Ford F150?

Start by inspecting the alternator, battery, and wiring for damage. Use a multimeter to test the alternatorâ€™s output and check for continuity in the load input circuit. A scan tool can confirm if the PCM is receiving the correct signal.

6. How do I fix the P1246 code on a 2002 Ford F150?

Repairs may include replacing the alternator, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if it is faulty.

7. Can a bad battery cause the P1246 code on a 2002 Ford F150?

While a bad battery may not directly cause the P1246 code, it can contribute to charging system issues that may trigger the code. Always test the battery as part of the diagnosis.

8. How much does it cost to fix a P1246 code on a 2002 Ford F150?

The cost depends on the specific issue. Replacing an alternator typically costs $300-$600, while wiring repairs or a PCM replacement could vary widely.

9. How do I reset the P1246 code after repairs on a 2002 Ford F150?

Use an OBDII scan tool to clear the code after completing repairs. Make sure the underlying issue is resolved, or the code may return.

10. Can a P1246 code cause long-term damage to my 2002 Ford F150?

If left unresolved, the code can lead to a drained battery, electrical failures, and potential stalling, which may cause further damage to the vehicleâ€™s electrical system.