Engine-CodesFord – P1107 Ford

P1107 Ford Code - Dual Alternator Lower Circuit Malfunction

Quick Answer

The P1107 Ford code indicates a Dual Alternator Lower Circuit Malfunction. Common causes include Faulty wiring or connections in the alternator circuit, Failing alternator, Damaged 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
P1107 Ford indicates Dual Alternator Lower Circuit Malfunction.
Common causes
Common causes include Faulty wiring or connections in the alternator circuit, Failing alternator, Damaged 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.
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1107 Ford Description

The P1107 Ford code indicates a Dual Alternator Lower Circuit Malfunction. In vehicles with dual alternators, this code specifically points to an issue in the lower circuit of one of the alternators. The alternator plays a crucial role in the vehicle's electrical system by converting mechanical energy into electrical energy to power the vehicle's electrical components and recharge the battery. When the lower circuit of the alternator is malfunctioning, it can lead to a variety of issues that affect the vehicle's performance and electrical system.

OBDII Code P1107 Ford - Dual Alternator Lower Circuit Malfunction
P1107 Ford Code - Dual Alternator Lower Circuit Malfunction

Common Causes of P1107 Ford

  1. Faulty wiring or connections in the alternator circuit
  2. Failing alternator
  3. Damaged alternator belt
  4. Issues with the alternator control module

Symptoms of P1107 Ford

  1. Check engine light illuminated on the dashboard
  2. Dimming or flickering lights
  3. Erratic behavior of electrical components
  4. Vehicle struggles to start
  5. Rough idle

How to Fix P1107 Ford

  1. Begin by diagnosing the specific alternator causing the issue using a diagnostic scanner and multimeter to test the circuit.
  2. Inspect the wiring and connections in the alternator circuit for any damage or corrosion. Repair or replace as needed.
  3. Test the alternator's output using a multimeter to ensure it is functioning properly. Replace the alternator if necessary.
  4. Check the condition of the alternator belt and replace if worn or damaged.
  5. Clear the code with a diagnostic scanner and test the vehicle to ensure the issue has been resolved.

Cost to Fix P1107 Ford

The cost of repairing a Dual Alternator Lower Circuit Malfunction can vary depending on the specific cause of the issue and the extent of the repair needed. On average, the cost of parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $200. Keep in mind that these are rough estimates, and actual costs can vary based on factors such as location, vehicle make and model, and the shop's labor rates. It is recommended to contact local auto repair shops for a more accurate cost estimate.

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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.

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