CM2150 Electronic Control System – FAULT CODE 2198

VGT Actuator Driver Circuit – Root Cause Not Known


Fault Code: 2198
PID: S027
SPN: 641
FMI: 11/11
LAMP: Amber

VGT Actuator Driver Circuit – Root Cause Not Known. Intermittent communication between the smart VGT controller and the ECM has been detected. The VGT controller is not interpreting the J1939 message from the ECM correctly.

VGT actuation will be disabled.

ISB, ISC, and ISL with CM2150 – VGT Actuator Driver Circuit

Circuit Description

The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 datalink from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports failures back to the primary engine ECM using the J1939 datalink. The ECM then decodes the error message and converts it to a fault code.

Component Location

The VGT actuator is located on the turbocharger bearing housing. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes

The VGT actuator does not receive a valid J1939 message from the ECM for 1 second.

Action Taken When the Fault Code is Active

  • The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
  • The VGT will move to the default open position.
  • The EGR valve will be closed.
  • Active regeneration of the aftertreatment system is disabled.

Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light immediately after the VGT actuator receives a valid J1939 message from the ECM.

Shop Talk

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

This fault code is logged when the VGT smart actuator did not receive a valid J1939 message from the primary engine ECM for 1 second. Intermittent J1939 datalink connections or interference on the J1939 network are possible causes of this fault code. Also check for intermittent power supply and ground connections to the VGT actuator.

Refer to Troubleshooting Fault Code t05-2198

Last Modified:  20-Jul-2010