Fuel and air

P2568 — Turbocharger Boost Control Position Sensor Circuit High

Severity: medium Drive with care, to a shop

What P2568 means

The engine control module monitors a position sensor that reports how far the turbo's variable vanes or boost control mechanism are open. P2568 sets when the signal voltage is higher than expected, usually from an open circuit, a short to power, or a failed sensor. Without a reliable signal, the ECM cannot control boost accurately.

Symptoms

  • Check engine light on
  • Loss of power and sluggish acceleration
  • Limp mode
  • Low or unstable boost
  • Increased exhaust smoke
  • Worse fuel economy

Possible causes

  1. Open circuit in the position sensor signal wire
  2. Signal wire shorted to power
  3. Failed VGT actuator or position sensor
  4. Connector damaged by heat or moisture
  5. Corroded terminals or damaged wiring harness
  6. Rarely, a faulty ECM

How to diagnose

  1. Scan all codes and freeze frame data and look for other boost-related codes
  2. Inspect the harness and connector for heat damage, corrosion and chafing
  3. Compare the commanded and actual position in scan tool data
  4. Check the 5 V reference and ground at the sensor connector
  5. Test the signal wire for opens and shorts to power
  6. Check that the vane mechanism and actuator move freely and are not coked up
  7. Test the sensor against the manufacturer's specs
  8. Clear the code and road test after repair

Common fixes

  • Repair or replace the damaged wiring harness
  • Clean or replace the connector
  • Replace the position sensor or VGT actuator
  • Clean carbon buildup from the vane mechanism
  • Replace or reprogram the ECM if confirmed faulty

Questions and answers

What does P2568 mean?

It means a high signal or open circuit in the turbo boost control position sensor circuit. The ECM is not getting valid data on the boost mechanism's position.

Can I drive with P2568?

Only carefully and for a short distance, such as to a shop. Power will be reduced, and extended driving risks damaging the turbo.

What most often causes P2568?

Most often it is damaged wiring or a connector near the hot turbo, or a failed VGT sensor or actuator.

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.