Lost Communication With Fuel Temperature Sensor B

Where it lives

For U0671, the part to look at first is the sensor named here.

Check these first

• The bus drops fuel temperature sensor B
• An open signal circuit on the fuel temperature sensor
• A corroded connector at the fuel line
• A short in the sensor B harness
• A failed fuel temperature sensor B element

What to do next

1. Read fuel temperature sensor B on a scan tool
2. Inspect the sensor connector and wiring
3. Check the signal and ground circuits
4. Compare the reading against fuel tank temperature
5. Replace fuel temperature sensor B if it stays offline
6. Clear the code and retest

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