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Engine-Codes – Generic – U0479

U0479 Code - Invalid Data Received From Restraints System Sensor 'I'

Quick Answer

The diagnostic trouble code U0479 indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'I'. Common causes include Faulty restraints system sensor 'I', Loose or corroded wiring connections, Electronic control module (ECM) software issues. 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
U0479 indicates Invalid Data Received From Restraints System Sensor 'I'.
Common causes
Common causes include Faulty restraints system sensor 'I', Loose or corroded wiring connections, Electronic control module (ECM) software issues.
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 11, 2024
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Code U0479 Description

The diagnostic trouble code U0479 indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'I'. The restraints system sensor is responsible for monitoring various safety features in the vehicle, such as the airbags, seatbelt pretensioners, and other restraint systems. When the sensor detects a malfunction or sends incorrect data to the vehicle's computer, it can trigger the U0479 code.

OBDII Code U0479 - Invalid Data Received From Restraints System Sensor 'I'
U0479 Code - Invalid Data Received From Restraints System Sensor 'I'

Common Causes of U0479

  1. Faulty restraints system sensor 'I'
  2. Loose or corroded wiring connections
  3. Electronic control module (ECM) software issues
  4. Impact or collision that damaged the sensor
  5. Water or moisture intrusion affecting sensor functionality

Symptoms of U0479

  1. Airbag warning light illuminated on the dashboard
  2. Inoperative airbags or seatbelt pretensioners
  3. Loss of communication with the restraints system sensor
  4. Vehicle fails to pass a state inspection or emissions test

How to Fix U0479

  1. Begin by performing a visual inspection of the restraints system sensor 'I' and its wiring connections to check for any visible damage or corrosion.
  2. Use a diagnostic scan tool to retrieve the specific fault codes and data related to the U0479 code.
  3. Test the restraints system sensor 'I' using a multimeter to ensure it is functioning within the manufacturer's specified parameters.
  4. If the sensor is found to be faulty, replace it with a new sensor and reprogram the electronic control module (ECM) if necessary.
  5. Clear the fault codes from the vehicle's computer and perform a test drive to ensure the issue has been resolved.

Cost to Fix U0479

The typical repair costs for addressing the U0479 code can vary depending on the make and model of the vehicle, the location of the repair shop, and the extent of the damage. In general, the cost of replacing a restraints system sensor 'I' and addressing any associated issues can range from $200 to $500. Additional costs may apply for diagnostic testing, labor, and reprogramming of the ECM. It is advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

Need more information about the U0479 code?

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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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