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Engine-Codes – Generic – U0406

U0406 Code - Invalid Data Received From Fuel Injector Control Module

Quick Answer

The U0406 code indicates that the Engine Control Module (ECM) has detected invalid data coming from the Fuel Injector Control Module. Common causes include Wiring issues (e.g., loose or damaged connections), Faulty Fuel Injector Control Module, Malfunctioning ECM. 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
U0406 indicates Invalid Data Received From Fuel Injector Control Module.
Common causes
Common causes include Wiring issues (e.g., loose or damaged connections), Faulty Fuel Injector Control Module, Malfunctioning ECM.
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 09, 2024
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Code U0406 Description

The U0406 code indicates that the Engine Control Module (ECM) has detected invalid data coming from the Fuel Injector Control Module. The Fuel Injector Control Module is responsible for controlling the fuel injectors in the engine, which play a crucial role in the combustion process by delivering the right amount of fuel to the cylinders. When the ECM receives incorrect or inconsistent data from the Fuel Injector Control Module, it can lead to various issues with the engine's performance.

OBDII Code U0406 - Invalid Data Received From Fuel Injector Control Module
U0406 Code - Invalid Data Received From Fuel Injector Control Module

Common Causes of U0406

  1. Wiring issues (e.g., loose or damaged connections)
  2. Faulty Fuel Injector Control Module
  3. Malfunctioning ECM
  4. Communication error between modules
  5. Electrical interference or short circuits

Symptoms of U0406

  1. Poor fuel efficiency
  2. Rough idling
  3. Misfiring
  4. Hesitation during acceleration
  5. Stalling

How to Fix U0406

  1. Perform a thorough diagnostic scan to retrieve and record all fault codes.
  2. Inspect the wiring harness and connectors for any damage or loose connections.
  3. Test the Fuel Injector Control Module and ECM for proper functionality.
  4. Repair or replace any faulty components, such as the Fuel Injector Control Module or ECM.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix U0406

The cost of repairing the U0406 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a Fuel Injector Control Module can range from $200 to $600, while replacing an ECM can cost between $500 and $1,500. Labor costs can add an additional $80 to $150 per hour, and the total cost can range from $300 to $2,000 or more. It is advisable to consult with a professional mechanic to get a more accurate estimate based on your vehicle's make and model.

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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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