U0644
Lost Communication With Wastegate Position Sensor A
U0644 is an OBD-II diagnostic trouble code meaning: Lost Communication With Wastegate Position Sensor A. Common causes: open or short circuit in the sensor circuit, turbine position sensor malfunction. Estimated repair cost: $28–89.
Symptoms
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
- Turbojam during acceleration
- Emergency engine operation
Causes
- Open or short circuit in the sensor circuit
- Turbine position sensor malfunction
- Connector problems or contact corrosion
- Engine ECU malfunction
- Mechanical damage to the wastegate
How to Fix
- Check the integrity of the wiring harness to the sensor
- Check the voltage and resistance of the sensor
- Clean sensor connector contacts
- Replace the turbine position sensor if necessary
- Carry out ECU diagnostics if the error persists
Related codes
Error U0644 by Vehicle Brand
FAQ
What does the U0644 code mean?
U0644 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Wastegate Position Sensor A
What causes a U0644 error code?
The most common causes of U0644 include: Open or short circuit in the sensor circuit; Turbine position sensor malfunction; Connector problems or contact corrosion; Engine ECU malfunction.
How do I fix a U0644 diagnostic trouble code?
To fix U0644: Check the integrity of the wiring harness to the sensor. Check the voltage and resistance of the sensor. Clean sensor connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0644?
Limited driving only, diagnose soon
How much does it cost to fix U0644?
The estimated repair cost for U0644 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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