Fuel and air

P2564 — Turbocharger Boost Control Position Sensor Circuit Low

Severity: medium Drive with care, to a shop

What P2564 means

The engine control module reads a position sensor on the actuator that controls turbo boost (wastegate or variable geometry vanes). P2564 sets when that sensor signal falls below the expected range, usually from a short to ground, lost sensor supply or a failed sensor. Without a reliable signal the ECM cannot regulate boost accurately and often limits power.

Symptoms

  • Limp mode with reduced power
  • Low boost and sluggish acceleration
  • Check Engine light on
  • Possible unusual turbocharger noise
  • Inconsistent throttle response

Possible causes

  1. Failed position sensor in the turbo actuator
  2. Signal wire shorted to ground
  3. Heat-damaged wiring near the turbo
  4. Corroded or damaged sensor connector
  5. Faulty boost control actuator
  6. Rarely, a faulty ECM

How to diagnose

  1. Read codes and freeze frame data, clear the code and see if it returns
  2. Compare specified and actual boost in live data
  3. Inspect the harness and connector near the turbo for melting, chafing and corrosion
  4. Check hoses and vacuum lines to the actuator for cracks and leaks
  5. Check actuator movement through its full range for binding or play
  6. Measure 5 V reference, ground and signal at the sensor, and test the wiring for a short to ground
  7. Compare sensor readings with the manufacturer specification

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the position sensor or the actuator assembly
  • Replace damaged hoses and vacuum lines
  • Repair or replace the turbo if the mechanism is sticking
  • Perform actuator relearn if required and clear codes

Questions and answers

What does P2564 mean?

It means the signal from the turbo boost control position sensor is too low. The ECM cannot control boost accurately, so it often cuts power.

Can I drive with P2564?

Only briefly and carefully, to a shop. Power is limited, and uncontrolled boost can harm the turbo and engine.

What most often causes P2564?

Usually heat-damaged wiring near the turbo or a failed sensor in the actuator. Start by inspecting the harness and connector.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.