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U0671: Lost Communication With Fuel Temperature Sensor B

What Does U0671 Mean?

U0671 is a diagnostic trouble code indicating: Lost Communication With Fuel Temperature Sensor B. This code relates to the vehicle systems 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

U0666 Lost Communication With Reductant Pressure Sensor U0667 Lost Communication With Engine Oil Temperature Sensor A U0668 Lost Communication With Engine Oil Level Sensor Circuit U0669 Lost Communication With EGR Sensor D U0670 Lost Communication With Fuel Temperature Sensor A U0672 Lost Communication With Engine Coolant Pump U0673 Lost Communication With Ion Sense Module U0674 Lost Communication With Wastegate Position Sensor B