SPN 641 - FMI 11 (Fault Code 2198)

SPN641 FMI11
VGT Actuator Driver Circuit - Root Cause Not Known

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

Fault Code: 2198
PID(P), SID(S): S027
SPN: 641
FMI: 11/11
Lamp: Amber

REASON: 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.

EFFECT: VGT actuation will be disabled.

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.

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.

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.

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