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Engine-Codes – Generic – U017B

U017B Code - Lost Communication With Restraints System Sensor 'L'

Quick Answer

The U017B diagnostic trouble code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'L'. Common causes include Faulty Restraints System Sensor 'L', Damaged wiring or connectors in the airbag system, Corrosion or moisture intrusion 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
U017B indicates Lost Communication With Restraints System Sensor 'L'.
Common causes
Common causes include Faulty Restraints System Sensor 'L', Damaged wiring or connectors in the airbag system, Corrosion or moisture intrusion 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 Aug 19, 2024
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Code U017B Description

The U017B diagnostic trouble code indicates that the vehicle's onboard computer has lost communication with the Restraints System Sensor 'L'. The Restraints System Sensor 'L' is a component of the vehicle's safety system that helps to monitor and control the deployment of airbags and seatbelt pretensioners in the event of a collision. When communication with this sensor is lost, it can compromise the effectiveness of the vehicle's restraint system and pose a safety risk to the occupants.

OBDII Code U017B - Lost Communication With Restraints System Sensor 'L'
U017B Code - Lost Communication With Restraints System Sensor 'L'

Common Causes of U017B

  1. Faulty Restraints System Sensor 'L'
  2. Damaged wiring or connectors in the airbag system
  3. Corrosion or moisture intrusion in the sensor circuit
  4. Software glitches in the vehicle's onboard computer
  5. Electrical issues in the vehicle's wiring system

Symptoms of U017B

  1. Airbag warning light illuminated on the dashboard
  2. Inability to deploy airbags in the event of a collision
  3. Malfunctioning seatbelt pretensioners
  4. Loss of communication with other safety systems

How to Fix U017B

  1. Perform a thorough inspection of the Restraints System Sensor 'L' and associated wiring for any visible damage or corrosion.
  2. Test the sensor's functionality using a diagnostic tool to determine if it is faulty.
  3. Replace the Restraints System Sensor 'L' if it is found to be defective.
  4. Check and repair any damaged wiring or connectors in the airbag system.
  5. Clear the diagnostic trouble code from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.

Cost to Fix U017B

The cost of repairing the U017B code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the repair costs for addressing communication issues with the Restraints System Sensor 'L' can range from $200 to $500, including parts and labor. However, it is essential to consider that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as the location of the repair shop, the vehicle's complexity, and the availability of replacement parts can also impact the overall repair costs. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate for addressing the U017B code in a specific vehicle.

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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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