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Engine-Codes – Generic – P1245

P1245 Code - Alternator Load Input Failed Low

Quick Answer

The P1245 diagnostic trouble code refers to an issue with the alternator load input being detected as too low by the vehicle's engine control module (ECM). Common causes include Faulty alternator, Loose or corroded electrical connections, Defective alternator belt. 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 indicates Alternator Load Input Failed Low.
Common causes
Common causes include Faulty alternator, Loose or corroded electrical connections, Defective alternator belt.
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 06, 2024
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Code P1245 Description

The P1245 diagnostic trouble code refers to an issue with the alternator load input being detected as too low by the vehicle's engine control module (ECM). The alternator load input is a crucial parameter that helps the ECM determine the electrical load on the vehicle's charging system. When the alternator load input is too low, it indicates that the alternator may not be supplying enough electrical power to meet the vehicle's demands, potentially leading to battery drain and electrical system malfunctions. This can result in the vehicle's battery not being charged properly, causing issues with starting the vehicle, dimming lights, and other electrical accessories not working correctly.

OBDII Code P1245 - Alternator Load Input Failed Low
P1245 Code - Alternator Load Input Failed Low

Common Causes of P1245

  1. Faulty alternator
  2. Loose or corroded electrical connections
  3. Defective alternator belt
  4. Faulty ECM
  5. Electrical system issues

Symptoms of P1245

  1. Dimming or flickering lights
  2. Difficulty starting the vehicle
  3. Battery warning light illuminated on the dashboard
  4. Electrical accessories not functioning properly
  5. Increased fuel consumption

How to Fix P1245

  1. Begin by checking the alternator belt for wear or damage. Replace if necessary.
  2. Inspect and tighten any loose or corroded electrical connections related to the alternator.
  3. Test the alternator's output voltage and current to ensure it is functioning correctly. Replace the alternator if it fails the test.
  4. Check the ECM for any faults or errors and reprogram or replace if necessary.
  5. Test the vehicle's electrical system to ensure proper functioning and address any underlying issues that may have caused the alternator load input to fail low.

Cost to Fix P1245

The cost to repair a P1245 code 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 there are underlying electrical system issues that need to be addressed. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific make and model of the vehicle.

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Code P1245 Information for Specific Makes

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.

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