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Engine-Codes – Generic – U0173

U0173 Code - Lost Communication With Restraints System Sensor 'D'

Quick Answer

The diagnostic trouble code (DTC) U0173 indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'D'. Common causes include Faulty Restraints System Sensor 'D', Wiring or connection issues, Malfunctioning 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
U0173 indicates Lost Communication With Restraints System Sensor 'D'.
Common causes
Common causes include Faulty Restraints System Sensor 'D', Wiring or connection issues, Malfunctioning 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 Sep 12, 2024
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Code U0173 Description

The diagnostic trouble code (DTC) U0173 indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'D'. The Restraints System Sensor 'D' is a component of the vehicle's safety system that is responsible for monitoring and detecting any potential issues related to the vehicle's restraint systems, including airbags and seat belt pretensioners.

OBDII Code U0173 - Lost Communication With Restraints System Sensor 'D'
U0173 Code - Lost Communication With Restraints System Sensor 'D'

Common Causes of U0173

  1. Faulty Restraints System Sensor 'D'.
  2. Wiring or connection issues.
  3. Malfunctioning onboard computer.
  4. Software glitches in the ECM.
  5. Water or corrosion damage to sensor or wiring.

Symptoms of U0173

  1. Airbag warning light illuminated on the dashboard.
  2. Inoperative airbags or seat belt pretensioners.
  3. Loss of power steering assist.
  4. Engine running in limp mode.
  5. Decreased fuel efficiency.

How to Fix U0173

  1. Begin by conducting a thorough inspection of the wiring and connections related to the Restraints System Sensor 'D' to check for any visible damage or corrosion.
  2. If no issues are found with the wiring, proceed to test the Restraints System Sensor 'D' using a diagnostic scanner to determine if it is functioning properly.
  3. If the sensor is found to be faulty, replace it with a new, OEM-approved sensor.
  4. Clear the DTC from the vehicle's ECM using a diagnostic scanner to reset the system and ensure proper communication is restored.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the airbag and restraint systems are functioning correctly.

Cost to Fix U0173

The typical repair costs for addressing the U0173 code can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this issue may range from $200 to $500, including the cost of a new Restraints System Sensor 'D' and labor for diagnostics and installation.

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Code U0173 Information for Specific Makes

  • U0173 Chrysler — Lost Communication With Left Side Satellite Acceleration Sensor 2
  • U0173 Dodge — Lost Communication With Left Side Satellite Acceleration Sensor 2
  • U0173 Fiat — Lost Communication With Left Side Satellite Acceleration Sensor 2
  • U0173 Jeep — Lost Communication With Left Side Satellite Acceleration Sensor 2
  • U0173 RAM — Lost Communication With Left Side Satellite Acceleration Sensor 2

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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