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Engine-Codes – Generic – U0407

U0407 Code - Invalid Data Received From Glow Plug Control Module

Quick Answer

The U0407 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has detected invalid data coming from the glow plug control module. Common causes include Faulty glow plug control module wiring, Malfunctioning glow plug control module, Poor electrical connections. 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
U0407 indicates Invalid Data Received From Glow Plug Control Module.
Common causes
Common causes include Faulty glow plug control module wiring, Malfunctioning glow plug control module, Poor electrical connections.
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 12, 2024
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Code U0407 Description

The U0407 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has detected invalid data coming from the glow plug control module. Glow plugs are crucial components in diesel engines, helping to warm up the combustion chamber for easier starting in cold conditions. The glow plug control module manages the operation of these plugs, ensuring they receive the correct amount of power and heat up appropriately.

OBDII Code U0407 - Invalid Data Received From Glow Plug Control Module
U0407 Code - Invalid Data Received From Glow Plug Control Module

Common Causes of U0407

  1. Faulty glow plug control module wiring
  2. Malfunctioning glow plug control module
  3. Poor electrical connections
  4. ECM communication network issues
  5. Corrosion or damage to wiring harnesses

Symptoms of U0407

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or misfires
  3. Decreased fuel efficiency
  4. Increased emissions
  5. Engine stalling in extreme cases

How to Fix U0407

  1. Diagnose the exact cause of the issue by conducting a comprehensive electrical system check.
  2. Inspect the glow plug control module wiring and connections for any damage or corrosion.
  3. Test the glow plug control module for proper functionality and replace if necessary.
  4. Repair or replace any faulty wiring harnesses or electrical connections.
  5. Clear the DTC from the ECM memory and test the vehicle to ensure the issue has been resolved.

Cost to Fix U0407

The typical repair costs for addressing the U0407 code can vary depending on the specific cause of the issue and the extent of the repair needed. In general, replacing a faulty glow plug control module or repairing wiring connections may cost between $200 and $500, including parts and labor. However, the total cost can increase if additional components need to be replaced or if extensive diagnostic work is required.

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Code U0407 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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