Engine

P2567 — Turbocharger Boost Control Position Sensor Circuit Low

Severity: medium Drive with care, to a shop

What P2567 means

The engine control module monitors a position sensor built into the turbocharger actuator, typically on a variable geometry turbo (VGT), to know how far the vanes or boost control mechanism are open. P2567 sets when the voltage in that sensor circuit stays below the expected range. Usual culprits are a signal wire shorted to ground, a lost sensor supply, or a failed sensor. Without a reliable position signal the ECM cannot control boost accurately.

Symptoms

  • Check Engine light on
  • Limp mode
  • Reduced power and weak acceleration
  • Poor performance under load
  • Possible smell of unburnt fuel or smoke from the exhaust
  • Worse fuel economy

Possible causes

  1. Signal wire shorted to ground in the position sensor circuit
  2. Failed position sensor in the turbo actuator
  3. Damaged wiring or connector near the turbo (heat, chafing, corrosion)
  4. Open circuit or lost 5 V reference to the sensor
  5. Failed turbo actuator
  6. Rarely, a faulty ECM

How to diagnose

  1. Scan all codes and freeze frame data and note any other boost-related codes
  2. Inspect the harness and connector at the turbo actuator for melting, chafing, oil, moisture and corrosion
  3. With a scan tool, compare commanded and actual actuator position and watch the sensor voltage
  4. Check reference voltage and ground at the sensor connector using the factory wiring diagram
  5. Test the signal wire for a short to ground and for continuity back to the ECM
  6. Check that the actuator linkage or vane mechanism moves freely and is not seized or sooted up
  7. If wiring tests good, test or replace the actuator with its sensor, then consider the ECM

Common fixes

  • Repair or replace damaged wiring or the connector
  • Clean connector terminals and fix the source of moisture
  • Replace the turbo actuator with position sensor
  • Clean or repair a stuck variable geometry mechanism
  • Clear codes and perform actuator adaptation or calibration with a scan tool if the model requires it

Questions and answers

What does P2567 mean?

The ECM detected a low voltage signal in the turbo boost control position sensor circuit. It usually points to a short to ground, wiring trouble, or a failed actuator sensor.

Can I drive with code P2567?

Briefly and carefully, for example to a shop, since power is likely limited. Do not put off repairs, because incorrect boost control can damage the engine and turbo.

What should I check first?

Start with a visual check of the wiring and connector at the turbo, as harnesses near hot parts fail most often. Then check the sensor signal voltage with a scan tool.

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.