Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor

Where it lives

For U0656, the description names the sensor as the part involved.

Check these first

• The bus cannot reach the boost control A position sensor
• A worn position sensor track inside boost control A
• A broken wire at the boost control actuator
• A corroded connector on the turbo actuator
• A failed boost control A position sensor element

What to do next

1. Read boost control A position on a scan tool
2. Inspect the actuator connector and wiring
3. Check the position sensor signal and ground circuits
4. Command the boost actuator and watch position feedback
5. Replace the boost control A position sensor if it stays offline
6. Clear the code and retest

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