U0171
Lost Communication With Restraints System Sensor B
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$22–167 (est.)
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