CM850 Electronic Control System – FAULT CODE 2383

Variable Geometry Turbocharger Actuator Circuit – Current Below Normal, or Open Circuit


Fault Code: 2383
PID: S027
SPN: 641
FMI: 5/5
LAMP: Amber

Variable Geometry Turbocharger actuator circuit – current below normal, or open circuit.

Possible low power. Power removed from the turbocharger actuator motor.

Turbocharger Actuator Circuit

Circuit Description

The electronic control module (ECM) controls the turbocharger actuator, which changes the airflow of the turbocharger based on various engine operating conditions. The sliding nozzle in the turbocharger is operated by the turbocharger actuator motor. The actuator is a DC motor that receives voltage from the ECM.

Component Location

The turbocharger actuator motor is part of the turbocharger actuator assembly, which is located on the exhaust side of the engine and is mounted to the bearing housing of the turbocharger. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

The ECM monitors the voltage level of this circuit and logs a fault code if the voltage level indicates an open circuit or short to voltage source is present. This fault is always set inactive when the keyswitch is turned on. If the fault condition reoccurs while the keyswitch is in the ON position, the fault code will be set active. Since active faults are set inactive at key-on, this troubleshooting tree should be used to troubleshoot active and inactive faults. Possible causes of this fault include:

  • An open circuit in the engine harness, connectors, motor, or ECM
  • Turbocharger actuator motor signal (+ or -) leads shorted to a voltage source in the engine harness or ECM.

Do not supply voltage of any kind to the EGR valve motor. This circuit uses a pulse-width-modulated signal and direct voltage can permanently damage the motor.

Refer to Troubleshooting Fault Code t05-2383

Last Modified:  08-Jul-2010