AutoCodes – Generic – P1246

P1246 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 42,409

How popular is this code, among other codes? Medium

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1246 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 - Alternator Load Input Failed - AutoCodes.com — P1246 Code - Alternator Load Input Failed

What does this mean?

What are the Possible Causes of the DTC P1246?

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?

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 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 code?

Need more information on how to fix the P1246 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1246 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1246 Acura — Accelerator Pedal Position Sensor 1 Circuit Malfunction
P1246 Audi — Needle Lift Sensor Circuit Range Performance
P1246 Ford — Alternator Load Input Failed
P1246 Honda — Accelerator Pedal Position Sensor 1 Circuit Malfunction
P1246 Isuzu — Low Fuel Pressure Regulator Circuit Malfunction
P1246 Jaguar — No Cranking Signal High Signal
P1246 Lincoln — Alternator Load Input Failed
P1246 Mazda — Alternator Load Input Failed
P1246 Mercury — Alternator Load Input Failed
P1246 Mitsubishi — Communication Error
P1246 Saab — Intake Manifold Air Control Solenoid Inner Flap Open Circuit/Short To Ground
P1246 Volkswagen — Needle Lift Sensor Circuit Range Performance

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 Code

1. What are the common symptoms of OBDII code P1246 (Alternator Load Input Failed)?

- Common symptoms include dimming or flickering headlights, electrical system malfunctions, and a dead or weak battery.

2. What are the possible causes of OBDII code P1246?

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

3. How can I diagnose OBDII code P1246?

- Diagnosing this code usually involves checking the alternator's output voltage, inspecting the wiring and connectors for damage, and testing the alternator load input sensor for proper operation.

4. Can I still drive my vehicle with OBDII code P1246 active?

- It is not recommended to drive the vehicle with this code active, as it can lead to potential electrical system failures and battery drainage.

5. How can I repair OBDII code P1246?

- Repair methods may include replacing the alternator, repairing damaged wiring or connectors, or replacing the alternator load input sensor.

6. Will resetting the OBDII code P1246 make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing the code needs to be diagnosed and repaired.

7. Is it safe to continue driving if the OBDII code P1246 comes and goes intermittently?

- It is not recommended to ignore intermittent occurrences of this code, as it indicates an underlying issue that should be addressed to prevent potential electrical system failures.

8. How much does it typically cost to repair OBDII code P1246?

- The cost of repairing this code can vary depending on the specific cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P1246, or is it best left to professionals?

- While diagnosing and repairing this code may be possible for experienced DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

10. Are there any preventative maintenance tips to avoid OBDII code P1246 in the future?

- Regularly inspecting the alternator, checking the electrical system for any abnormalities, and ensuring proper battery maintenance can help prevent issues that may trigger OBDII code P1246.