Cummins ISB4.5 CM2150 Fault Code: 2449 PID: SID 27 SPN: 641 FMI: 13 VGT Actuator Controller – Out of Calibration.

Circuit Description
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports errors back to the primary engine ECM using the J1939 data link.

Component Location
The VGT actuator is located on the turbocharger bearing housing.

Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is initially turned to the ON position.

The keyswitch must be completely turned off for more than 30 seconds before this diagnostic can run at initial key ON.

Conditions for Setting the Fault Codes
The internal position reference is not detected during the VGT actuator learn process due to mechanical system binding or internal condition. The actual VGT actuator position is not known.

Action Taken When the Fault Code is Active
-The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
-VGT actuation will be disabled.

Conditions for Clearing the Fault Code
The keyswitch must be completely turned off for more than 30 seconds before this diagnostic will run at initial key ON.

The fault code will clear at key ON if the error condition no longer exists. The ECM will turn off the red STOP ENGINE light and enable VGT operation immediately after the diagnostic runs and passes.

Shop Talk
This fault code is logged when one of the following error conditions exists:

-If the turbocharger actuator has just been replaced and this fault code is active, this usually indicates that the turbocharger actuator has not been installed correctly. The gear alignment between the actuator and the turbocharger housing is misaligned.
-Foreign material in the VGT turbocharger can prevent the sliding nozzle from moving to the desired position at key-on.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree, if applicable. Progressive damage to the aftertreatment system may have occurred