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Engine-Codes – Generic – U1118

U1118 Code - Lost Engine Message

Quick Answer

The U1118 diagnostic trouble code (DTC) refers to a "Lost Engine Message," indicating a communication error between the engine control module (ECM) and other modules in the vehicle. Common causes include Faulty wiring or connectors, Malfunctioning ECM, Communication errors with other modules. 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
U1118 indicates Lost Engine Message.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning ECM, Communication errors with other modules.
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 07, 2024
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Code U1118 Description

The U1118 diagnostic trouble code (DTC) refers to a "Lost Engine Message," indicating a communication error between the engine control module (ECM) and other modules in the vehicle. This code typically occurs in modern vehicles equipped with complex electronic systems that rely on various modules to communicate and share data. When the ECM is unable to send or receive messages from other modules, it can lead to performance issues and potential safety concerns.

OBDII Code U1118 - Lost Engine Message
U1118 Code - Lost Engine Message

Common Causes of U1118

  1. Faulty wiring or connectors
  2. Malfunctioning ECM
  3. Communication errors with other modules
  4. Software glitches in the vehicle's electronic systems

Symptoms of U1118

  1. Engine misfires
  2. Rough idling
  3. Stalling
  4. Reduced power
  5. Dashboard warning lights

How to Fix U1118

  1. Perform a comprehensive diagnostic scan to identify the exact cause of the communication error.
  2. Inspect and test the wiring and connectors for any signs of damage or corrosion.
  3. Check the ECM and other modules for proper functioning and communication.
  4. Address any software glitches by updating the vehicle's software if necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U1118

The typical repair costs for addressing a U1118 code can vary depending on the specific cause of the communication error. In general, the repair may range from $100 to $500, including parts and labor. However, the actual cost can be higher if extensive diagnostics or component replacements are required. It's advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model, as well as local labor rates.

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Code U1118 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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