Engine-Codes.com
Engine-Codes – Generic – U0172

U0172 Code - Lost Communication With Restraints System Sensor 'C'

Quick Answer

The U0172 code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'C'. Common causes include Faulty Restraints System Sensor 'C', Wiring or connection issues between the sensor and the vehicle's computer, Corrosion or damage to the sensor or its connectors. 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
U0172 indicates Lost Communication With Restraints System Sensor 'C'.
Common causes
Common causes include Faulty Restraints System Sensor 'C', Wiring or connection issues between the sensor and the vehicle's computer, Corrosion or damage to the sensor or its connectors.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0172 Description

The U0172 code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'C'. This sensor is responsible for monitoring and providing data related to the vehicle's restraint system, which includes the airbags and seatbelt pretensioners. When communication with this sensor is lost, it can potentially compromise the effectiveness of the vehicle's safety systems.

OBDII Code U0172 - Lost Communication With Restraints System Sensor 'C'
U0172 Code - Lost Communication With Restraints System Sensor 'C'

Common Causes of U0172

  1. Faulty Restraints System Sensor 'C'
  2. Wiring or connection issues between the sensor and the vehicle's computer
  3. Corrosion or damage to the sensor or its connectors
  4. Software or programming issues in the vehicle's computer system

Symptoms of U0172

  1. Airbag warning light illuminated on the dashboard
  2. Seatbelt warning light illuminated on the dashboard
  3. Airbags not deploying in a collision
  4. Seatbelt pretensioners not engaging in a collision

How to Fix U0172

  1. Perform a diagnostic scan to confirm the U0172 code and identify the specific issue with the Restraints System Sensor 'C'.
  2. Inspect the wiring and connectors associated with the sensor for any damage or corrosion. Repair or replace as needed.
  3. Test the sensor to ensure it is functioning properly. If the sensor is faulty, replace it with a new one.
  4. Clear the U0172 code from the vehicle's computer system and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further troubleshooting may be required to identify any underlying issues with the vehicle's computer system.

Cost to Fix U0172

The cost of repairing the U0172 code can vary depending on the specific issue that is causing the communication loss with the Restraints System Sensor 'C'. In general, the cost of parts for replacing the sensor or repairing wiring/connectors can range from $100 to $300. Labor costs at an auto repair shop typically range between $80 and $150 per hour, and the total repair cost can range from $200 to $500 or more. It is advisable to check with local auto repair shops for more accurate estimates based on the specific make and model of the vehicle.

Need more information about the U0172 code?

Need more information on how to fix the U0172 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0172 code diagnosed by a professional: Find a repair shop in your area

Code U0172 Information for Specific Makes

  • U0172 Chrysler — Lost Communication With Left Side Satellite Acceleration Sensor 1
  • U0172 Dodge — Lost Communication With Left Side Satellite Acceleration Sensor 1
  • U0172 Fiat — Lost Communication With Left Side Satellite Acceleration Sensor 1
  • U0172 Jeep — Lost Communication With Left Side Satellite Acceleration Sensor 1
  • U0172 RAM — Lost Communication With Left Side Satellite Acceleration Sensor 1

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.

Frequently Asked Questions about U0172 Code

No Frequently Asked Questions about U0172 Code found.

Discuss the causes and fixes for U0172 OBDII Code

Submit a New Comment

Code U0172 comments

No comments found for this page.