U0643

Lost Communication With Turbocharger/Supercharger A Temperature Sensor

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Emergency engine operation
Unstable operation of the turbocharger
Possible turbine overheating

Causes

Open or short circuit in the sensor circuit
Turbocharger temperature sensor malfunction
Poor contact in connectors
Wiring harness damage
Problems with the ECU

How to Fix

Check the integrity of the wiring to the sensor
Check connections and connector contacts
Test the temperature sensor with a multimeter
Replace sensor if necessary
Check the operation of the computer for errors

Related codes

U0641 U0642 U0644