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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P2563

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC P2563: Turbocharger Boost Control Position Sensor Performance

Circuit/System Description

The position of the turbocharger vanes is controlled by the engine control module (ECM). The ECM utilizes a turbocharger vane control solenoid valve to control the turbocharger vanes, and a turbocharger vane position sensor to verify the position of the vanes. The ECM will vary the boost dependant upon the load requirements of the engine. Movement of the TC position sensor from the closed position to the open position provides the ECM with a signal voltage through the position sensor signal circuit.

The vane position sensor uses the following 3 circuits:

    •  A 5-volt reference circuit
    •  A low reference circuit
    •  A signal circuit

The ECM provides the TC vane position sensor with 5 volts on the 5-volt reference circuit and a ground on the low reference circuit.

Conditions for Running the DTC
    • DTCs P0047, P0048, P0652, P0653, P2564, and P2565 are not set.
    • The coolant temperature is between -7 and +119°C (+19 and +246°F).
    • The engine speed is between 500-2550 RPM.
    • The vane Position Learn is complete.

Vane Position Learning Condition

    • The engine speed is between 500-700 RPM.
    • The vehicle speed is less than 16 km/h (10 mph).
    • The engine coolant temperature is between 60-100°C (140-212°F).
    • The fuel temperature is between 0-300°C (32-572°F).
    • The barometric pressure is less than 50 kPa.
    • The oil pressure is more than 100 kPa for longer than 8 seconds.
    • The above conditions are met for 10 seconds.

Conditions for Setting the DTC
    • The difference of actual vane position and target vane position is more than 15 percent.
    • The difference of actual vane position and old actual vane position is less than 0.2 percent.

Action Taken When the DTC Sets

DTC P2563 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P2563 is a Type B DTC.

Diagnostic Aids
    • Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
    • A MAP sensor that is skewed or bias may cause this DTC to set.
    • A restricted oil supply feed to the turbocharger may cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

    •  Engine Controls Component Views
    •  Engine Control Module Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Verification
  1. If DTC P003A, P0045, P0698, P0699, P2564, P2565 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further information.
  2. Engine running, observe the TC Vane Position Sensor and the TC Desired Vane Position Sensor parameters. Command the TC vane position sensor in 5 percent increments, from 0-100  percent. The TC Vane Position Sensor and the Desired TC Vane Position parameters should remain equal to or near the commanded TC Vane Position.
  3. Engine running at idle speed, observe the scan tool TC Vane Position Sensor and the Desired TC Vane Position parameters while slowly increasing the engine speed to 2,500 RPM and slowly returning to idle speed.
    4. ⇒The TC Vane Position Sensor parameter should remain near or equal to the Desired TC Vane Position parameter throughout the engine speed range.

Circuit/System Testing

Important: You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector of the TC vane position solenoid.
  2. Connect the J 34730-405 between the TC solenoid high control and low control circuits.
  3. Engine running, command the TC Pos. Cntrl. Solenoid ON and OFF with a scan tool. The test lamp should go from Bright to Dim.
    4. ⇒If the test lamp does not go from Bright to Dim with each command, test the TC solenoid high control and low control circuits for an open or short to ground. If the circuits test normal, test the low control and high control circuits for a short to voltage. If the circuits test normal, replace the ECM.
  4. Ignition OFF, disconnect the harness connectors at the TC vane position sensor, TC vane position solenoid, and the ECM.
  5. Ignition OFF, test for less than 5 ohms of resistance on all TC vane position sensor and TC vane position solenoid circuits between the ECM and the sensor or solenoid.
    6. ⇒If greater than 5 ohms, repair the affected circuit for an open/high resistance.
  6. Connect the ECM, the TC vane position sensor, and the TC vane position solenoid.
  7. If all the circuits test normal, test the TC vane position sensor and the TC vane position solenoid. Refer to Component Testing for instructions.
  8. Inspect the turbocharger for debris, sticking vanes, or damage.
    9. ⇒If all circuits and the TC vane position sensor test normal, replace the turbocharger.

Component Testing

Important: You must perform the Circuit/System Testing before proceeding with any of the Component Tests.

TC Vane Position Sensor

  1. Remove the TC vane position sensor.
  2. Connect the TC vane position sensor harness connector.
  3. Ignition ON, observe the scan tool TC Vane Position Sensor parameter for a smooth percentage change while slowly depressing the button at the end of the TC vane position sensor. The percentage change should increment slowly without any spikes or dropouts.
    4. ⇒If the TC Vane Position parameter drops out or spikes, replace the TC vane position sensor.

Repair Instructions
    •  Turbocharger Replacement
    •  Turbocharger Vane Position Sensor Replacement
    •  Control Module References for ECM replacement, setup, and programming

Repair Verification
  1. Engine running, observe the TC Vane Position Sensor and the Desired TC Vane Position parameters. Slowly increase the engine speed to 2,500 RPM, and slowly return the engine speed to idle.
  2. The TC Vane Position Sensor parameter should remain near or equal to the desired TC Vane Position parameter.