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Engine-Codes – Generic – U0171

U0171 Code - Lost Communication With Restraints System Sensor 'B'

Quick Answer

The U0171 code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'B'. Common causes include Faulty Restraints System Sensor 'B', Wiring or connection issues between the sensor and the onboard 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
U0171 indicates Lost Communication With Restraints System Sensor 'B'.
Common causes
Common causes include Faulty Restraints System Sensor 'B', Wiring or connection issues between the sensor and the onboard 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 Aug 30, 2024
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Code U0171 Description

The U0171 code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'B'. This sensor is responsible for monitoring the status of the vehicle's restraint systems, such as airbags and seatbelt pretensioners. When communication is lost with this sensor, it can lead to a potentially dangerous situation as the vehicle's safety systems may not function properly in the event of a collision.

OBDII Code U0171 - Lost Communication With Restraints System Sensor 'B'
U0171 Code - Lost Communication With Restraints System Sensor 'B'

Common Causes of U0171

  1. Faulty Restraints System Sensor 'B'
  2. Wiring or connection issues between the sensor and the onboard computer
  3. Corrosion or damage to the sensor or its connectors
  4. Software issues with the vehicle's computer system
  5. Electrical interference or disruptions

Symptoms of U0171

  1. Airbag warning light illuminated on the dashboard
  2. Inconsistent or non-functioning airbags
  3. Seatbelt warning light staying on
  4. Erratic behavior of seatbelt pretensioners
  5. Loss of communication with other safety systems

How to Fix U0171

  1. Begin by conducting a visual inspection of the wiring and connectors associated with the Restraints System Sensor 'B'.
  2. Use a diagnostic scanner to reset the code and attempt to reestablish communication with the sensor.
  3. Test the sensor for proper functionality and replace if necessary.
  4. Check for any software updates or recalibrations needed for the vehicle's computer system.
  5. Clear any stored codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix U0171

The cost of repairing a U0171 code can vary depending on the specific cause of the issue. In general, the cost of parts for a sensor replacement or wiring repair could range from $100 to $300, while the labor cost could be between $100 and $200. This estimate does not include diagnostic fees, taxes, or any additional parts or repairs that may be necessary. It's recommended to consult with a professional mechanic to get an accurate quote for your specific vehicle and location.

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Code U0171 Information for Specific Makes

  • U0171 Chrysler — Lost Communication With Up-Front Right Satellite Acceleration Sensor
  • U0171 Dodge — Lost Communication With Up-Front Right Satellite Acceleration Sensor
  • U0171 Fiat — Lost Communication With Up-Front Right Satellite Acceleration Sensor
  • U0171 Jeep — Lost Communication With Up-Front Right Satellite Acceleration Sensor
  • U0171 RAM — Lost Communication With Up-Front Right Satellite Acceleration Sensor

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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