U0657

Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–89 (est.)

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

U0656 U0658 P2563