Lost Communication With Turbocharger/Supercharger A Temperature Sensor

Where it lives

For U0643, start at the sensor the description names.

Check these first

• The bus cannot see the turbocharger temperature sensor A
• A heat damaged sensor A signal wire
• A corroded connector near the turbocharger
• A short in the sensor A harness
• A failed temperature sensor A element

What to do next

1. Read turbocharger temperature sensor A on a scan tool
2. Inspect the sensor wiring for heat damage
3. Check the connector for corrosion
4. Test the sensor signal and ground circuits
5. Replace turbocharger temperature sensor A if it stays offline
6. Clear the code and retest

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