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Engine-Codes – Generic – U047D

U047D Code - Invalid Data Received From Restraints System Sensor 'M'

Quick Answer

The U047D diagnostic trouble code refers to "Invalid Data Received from Restraints System Sensor 'M'." This code indicates that the vehicle's onboard computer has detected a communication problem with the restraint system sensor 'M'. Common causes include Faulty or damaged restraint system sensor 'M', Wiring or electrical issues in the restraint system circuit, Loose or corroded connections in the sensor circuit. 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
U047D indicates Invalid Data Received From Restraints System Sensor 'M'.
Common causes
Common causes include Faulty or damaged restraint system sensor 'M', Wiring or electrical issues in the restraint system circuit, Loose or corroded connections in the sensor circuit.
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 U047D Description

The U047D diagnostic trouble code refers to "Invalid Data Received from Restraints System Sensor 'M'." This code indicates that the vehicle's onboard computer has detected a communication problem with the restraint system sensor 'M'. The restraint system sensor 'M' is responsible for monitoring and detecting any irregularities or impacts that could affect the vehicle's airbag deployment and seat belt pretensioners.

OBDII Code U047D - Invalid Data Received From Restraints System Sensor 'M'
U047D Code - Invalid Data Received From Restraints System Sensor 'M'

Common Causes of U047D

  1. Faulty or damaged restraint system sensor 'M'.
  2. Wiring or electrical issues in the restraint system circuit.
  3. Loose or corroded connections in the sensor circuit.
  4. Software glitches or communication errors within the vehicle's onboard computer.
  5. Impact or physical damage to the sensor or surrounding components.

Symptoms of U047D

  1. Airbag warning light illuminated on the dashboard.
  2. Seat belt warning light activated.
  3. Inconsistent or erratic airbag deployment.
  4. Unusual noises coming from the restraint system.
  5. Vehicle failing to pass a safety inspection due to airbag system malfunction.

How to Fix U047D

  1. Begin by conducting a thorough visual inspection of the restraint system sensor 'M', looking for any signs of damage or corrosion.
  2. Use a diagnostic scan tool to retrieve and clear the U047D trouble code from the vehicle's onboard computer.
  3. Test the sensor's functionality using a multimeter to ensure it is sending accurate data to the computer.
  4. Check and repair any damaged wiring or connections in the sensor circuit.
  5. If the sensor is found to be faulty, replace it with a new, OEM-approved part to restore proper functionality.

Cost to Fix U047D

The typical repair cost for addressing the U047D code can vary depending on the extent of the issue and the specific components that need to be repaired or replaced. On average, repairing the restraint system sensor 'M' and associated wiring can range from $200 to $500, including parts and labor. However, it is essential to note that actual repair costs may differ based on the location of the repair shop, the vehicle make and model, and any additional services needed. It is recommended to consult with a qualified mechanic to obtain a more accurate estimate for this repair.

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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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