Cummins ISC CM2150 (2007-09) Fault Code: 2634 PID: SID 027 SPN: 641 FMI: 12 VGT Actuator Controller - Bad Intelligent Device or Component. An internal error has been detected by the smart VGT controller.

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, calibrate the ECM.

This fault code is logged when the VGT smart actuator detected an internal error within the VGT actuator. The VGT actuator will stop controlling the turbocharger when this fault code is active.

Fault Code 2634 will become active if the VGT actuator is removed from the turbocharger and then the keyswitch is turned to the on position or it may be possible for it to become active if the actuator fails the install/calibrate procedure. If this occurs, disconnect the VGT actuator from the engine harness with the keyswitch on, and connect the VGT actuator to the engine harness. Fault Code 2634 should go inactive. Follow the VGT actuator installation procedure to install the VGT actuator.

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.

For ISB engines, see the following procedure in the ISB CM2150 Service Manual, Bulletin 4021578. For ISC and ISL engines, see the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569.

Possible repairs:

1)Remove the actuator and install it in the correct position.
2)Replace the VGT actuator.
3)Replace the damaged aftertreatment component.
4)If necessary, calibrate the ECM.