U0656

Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

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

U0655 U0657 P2262