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Engine-Codes – Generic – U1121

U1121 Code - Lost Communication With Electric Stability Program Module

Quick Answer

The U1121 code indicates that the vehicle has lost communication with the Electric Stability Program (ESP) module. Common causes include Damaged wiring or connectors leading to the ESP module, Faulty Electric Stability Program module, Malfunctioning Controller Area Network (CAN) bus. 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
U1121 indicates Lost Communication With Electric Stability Program Module.
Common causes
Common causes include Damaged wiring or connectors leading to the ESP module, Faulty Electric Stability Program module, Malfunctioning Controller Area Network (CAN) bus.
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 U1121 Description

The U1121 code indicates that the vehicle has lost communication with the Electric Stability Program (ESP) module. The ESP system is responsible for helping to maintain the vehicle's stability and prevent skidding during sudden maneuvers. When communication with this module is lost, it can lead to a loss of control over the vehicle's stability features, potentially compromising the safety of the vehicle.

OBDII Code U1121 - Lost Communication With Electric Stability Program Module
U1121 Code - Lost Communication With Electric Stability Program Module

Common Causes of U1121

  1. Damaged wiring or connectors leading to the ESP module
  2. Faulty Electric Stability Program module
  3. Malfunctioning Controller Area Network (CAN) bus
  4. Software glitch in the vehicle's electronic control module
  5. Water damage or corrosion affecting the ESP module

Symptoms of U1121

  1. Illumination of the ESP warning light on the dashboard
  2. Decreased traction control and stability while driving
  3. Difficulty steering or maintaining control during sudden maneuvers
  4. Loss of responsiveness in the vehicle's stability features
  5. Possible transmission shifting issues

How to Fix U1121

  1. Perform a diagnostic scan to confirm the U1121 code and identify the specific issue.
  2. Inspect and repair any damaged wiring or connectors leading to the ESP module.
  3. Test the ESP module for functionality and replace if found to be faulty.
  4. Check and potentially repair the Controller Area Network (CAN) bus if necessary.
  5. Clear the code, reset the vehicle's system, and test drive to ensure the issue has been resolved.

Cost to Fix U1121

The typical repair costs for addressing a U1121 code can vary depending on the specific cause of the issue. In general, the repair for this code may range from $200 to $800, including parts and labor. However, it's important to note that actual costs can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, so it's recommended to obtain quotes from local shops for a more accurate estimate.

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Code U1121 Information for Specific Makes

  • U1121 Hyundai — Lost Communication With Electric Stability Program Module
  • U1121 KIA — Lost Communication With Electric Stability Program Module
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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  • Que tal espero me alleden tengo un megane 2007 motor 2.0 y dejo de acelerar al pareser el cuerpo de aceleracion no esta travajando cuando piso el pedal ya rebise y le llega 5 v al conector y su tierra y al escanear me arrojo el codigo U1123 Y U112B espero me ayuden o me orientes si es nesesario remplaser el cuerpo de aceleracion gracias.

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