U0171
Lost Communication With Restraints System Sensor B
U0171 is an OBD-II diagnostic trouble code meaning: Lost Communication With Restraints System Sensor B. Common causes: open or short circuit in the sensor circuit, safety sensor b malfunction. Estimated repair cost: $22–167.
Symptoms
- The airbag light on the dashboard is on
- The safety system may not work in an accident
- Errors in other CAN bus-related systems
- Possible problems with seat belt pretensioners
Causes
- Open or short circuit in the sensor circuit
- Safety sensor B malfunction
- Connector problems or contact corrosion
- Airbag module malfunction
- Problems with the car's CAN bus
How to Fix
- Check the continuity of the safety system sensor B
- Inspect and clean the sensor and ECU connectors
- Check sensor resistance according to manufacturer specifications
- Scan the CAN bus for errors
- Repair only from an authorized dealer
Related codes
Error U0171 by Vehicle Brand
FAQ
What does the U0171 code mean?
U0171 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Restraints System Sensor B
What causes a U0171 error code?
The most common causes of U0171 include: Open or short circuit in the sensor circuit; Safety sensor B malfunction; Connector problems or contact corrosion; Airbag module malfunction.
How do I fix a U0171 diagnostic trouble code?
To fix U0171: Check the continuity of the safety system sensor B. Inspect and clean the sensor and ECU connectors. Check sensor resistance according to manufacturer specifications. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0171?
Do not drive — repair immediately
How much does it cost to fix U0171?
The estimated repair cost for U0171 is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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