SPN 641 - FMI 13 (Fault Code 2449)

SPN641 FMI13
VGT Actuator Controller - Out of Calibration

ISB, ISC, and ISL - VGT Actuator Circuit

Fault Code: 2449
PID(P), SID(S): S027
SPN: 641
FMI: 13/13
Lamp: Red

REASON: VGT Actuator Controller - Out of Calibration. The VGT has failed the automatic calibration procedure at initial key-ON.

EFFECT: Low intake manifold pressure.

Circuit Description:
The variable geometry turbocharger (VGT) is electronic activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine 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 will run at initial key on.

Conditions for Setting the Fault Codes:
The internal position reference is not detected during the initial power-on 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.
• Active and stationary regeneration of the aftertreatment system is 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:
Verify the 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 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 keyon.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter.

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