U0643
Lost Communication With Turbocharger/Supercharger A Temperature Sensor
U0643 is an OBD-II diagnostic trouble code meaning: Lost Communication With Turbocharger/Supercharger A Temperature Sensor. Common causes: open or short circuit in the sensor circuit, turbocharger temperature sensor malfunction. Estimated repair cost: $17–56.
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
Error U0643 by Vehicle Brand
FAQ
What does the U0643 code mean?
U0643 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Turbocharger/Supercharger A Temperature Sensor
What causes a U0643 error code?
The most common causes of U0643 include: Open or short circuit in the sensor circuit; Turbocharger temperature sensor malfunction; Poor contact in connectors; Wiring harness damage.
How do I fix a U0643 diagnostic trouble code?
To fix U0643: Check the integrity of the wiring to the sensor. Check connections and connector contacts. Test the temperature sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0643?
Limited driving only, diagnose soon
How much does it cost to fix U0643?
The estimated repair cost for U0643 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat