U0657
Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor
U0657 is an OBD-II diagnostic trouble code meaning: Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor. Common causes: bypass valve position sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
Symptoms
- Reduced engine power
- Check Engine Light Illuminates
- Unstable engine operation
- Acceleration problems
- Turbocharging does not work
Causes
- Bypass valve position sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Wiring Harness Problems
- Engine ECU malfunction
How to Fix
- Check the integrity of the sensor circuit
- Inspect connectors and contacts for corrosion or damage
- Check the resistance of the position sensor
- Scan the system for other errors
- If necessary, replace the bypass valve position sensor
Related codes
Error U0657 by Vehicle Brand
FAQ
What does the U0657 code mean?
U0657 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor
What causes a U0657 error code?
The most common causes of U0657 include: Bypass valve position sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Wiring Harness Problems.
How do I fix a U0657 diagnostic trouble code?
To fix U0657: Check the integrity of the sensor circuit. Inspect connectors and contacts for corrosion or damage. Check the resistance of the position sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0657?
Limited driving only, diagnose soon
How much does it cost to fix U0657?
The estimated repair cost for U0657 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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