U0656
Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor
U0656 is an OBD-II diagnostic trouble code meaning: Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor. Common causes: open or short circuit in the sensor circuit, poor contact in the sensor connector. Estimated repair cost: $56–167.
Symptoms
- Reduced engine power
- Hesitation during acceleration
- Unstable operation of the turbocharger
- Check engine light comes on
- Engine transition to emergency mode
Causes
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Boost control position sensor malfunction
- Problems with the engine control unit
- Wiring harness damage
How to Fix
- Check the integrity of the wiring to the sensor
- Clean the contacts in the sensor and ECU connectors
- Test the boost control position sensor (resistance, voltage)
- Check the mechanical system for changing turbine geometry
- If necessary, replace the sensor or repair the wiring
Related codes
Error U0656 by Vehicle Brand
FAQ
What does the U0656 code mean?
U0656 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor
What causes a U0656 error code?
The most common causes of U0656 include: Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Boost control position sensor malfunction; Problems with the engine control unit.
How do I fix a U0656 diagnostic trouble code?
To fix U0656: Check the integrity of the wiring to the sensor. Clean the contacts in the sensor and ECU connectors. Test the boost control position sensor (resistance, voltage). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0656?
Limited driving only, diagnose soon
How much does it cost to fix U0656?
The estimated repair cost for U0656 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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