CM850 Electronic Control System – FAULT CODE 2385 (ISB/QSB Automotive or Industrial Application)

VGT Actuator Driver Circuit – Voltage Above Normal or Shorted to High Source


Fault Code: 2385
PID: S027
SPN: 641
FMI: 3/3
LAMP: Amber

VGT actuator driver circuit – voltage above normal or shorted to high source.

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

Turbocharger Actuator Motor Circuit

Circuit Description

The ECM controls the turbocharger actuator motor, 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

A possible cause of this fault is the turbocharger actuator signal (+ or -) leads can be shorted to a voltage source in the harness or the 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 t05-2385

Last Modified:  08-Jul-2010