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Engine-Codes – Generic – U0477

U0477 Code - Invalid Data Received From Restraints System Sensor 'G'

Quick Answer

The U0477 code indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'G'. Common causes include Faulty restraints system sensor 'G', Wiring or connection issues in the restraint system, Software glitches in the vehicle's onboard computer. 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
U0477 indicates Invalid Data Received From Restraints System Sensor 'G'.
Common causes
Common causes include Faulty restraints system sensor 'G', Wiring or connection issues in the restraint system, Software glitches in the vehicle's onboard computer.
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 Aug 18, 2024
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Code U0477 Description

The U0477 code indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'G'. This sensor is responsible for monitoring and reporting data related to the restraint system, including airbags and seatbelt pretensioners. When the system detects invalid data, it may not be able to accurately deploy the airbags or activate the seatbelt pretensioners in the event of a collision, compromising the safety of the vehicle occupants.

OBDII Code U0477 - Invalid Data Received From Restraints System Sensor 'G'
U0477 Code - Invalid Data Received From Restraints System Sensor 'G'

Common Causes of U0477

  1. Faulty restraints system sensor 'G'.
  2. Wiring or connection issues in the restraint system.
  3. Software glitches in the vehicle's onboard computer.
  4. Electrical interference or voltage irregularities.
  5. Damage to the restraint system due to an accident or impact.

Symptoms of U0477

  1. Airbag warning light illuminated on the dashboard.
  2. Inaccurate or inconsistent readings from the restraint system.
  3. Failure of airbags to deploy in a collision.
  4. Issues with seatbelt pretensioners not activating properly.
  5. Loss of communication with the restraint system module.

How to Fix U0477

  1. Begin by conducting a thorough inspection of the restraints system sensor 'G' and its wiring connections for any visible damage or corrosion.
  2. Test the sensor's functionality using a multimeter to ensure it is sending accurate data to the onboard computer.
  3. If the sensor is faulty, replace it with a new, OEM part and ensure proper calibration.
  4. Check and repair any damaged wiring or connections in the restraint system.
  5. Clear the diagnostic trouble codes from the vehicle's system and perform a test drive to verify that the issue has been resolved.

Cost to Fix U0477

The cost of repairing an issue related to the U0477 code can vary depending on the specific cause of the problem and the parts/labour rates in your area. Typically, replacing a faulty restraints system sensor 'G' can cost between $200 to $500, including parts and labour. However, additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a professional mechanic for an accurate diagnosis and cost estimate.

Need more information about the U0477 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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