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U0171: Lost Communication With Restraints System Sensor B

What Does U0171 Mean?

U0171 is a diagnostic trouble code indicating: Lost Communication With Restraints System Sensor B. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0166 Lost Communication With Auxiliary Heater Control Module U0167 Lost Communication With Vehicle Immobilizer Control Module U0168 Lost Communication With Vehicle Security Control Module U0169 Lost Communication With Sunroof Control Module U0170 Lost Communication With Restraints System Sensor A U0172 Lost Communication With Restraints System Sensor C U0173 Lost Communication With Restraints System Sensor D U0174 Lost Communication With Restraints System Sensor E