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Flash: Drivetrain Control Module (DTCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): C147B-92 - Front Axle Disconnect Sensor Performance or Incorrect Operation. Customers may comment on one or more of the following: 4WD system warning lights, service messages, or flashing indicators are displayed in the Instrument Panel Cluster (IPC). The vehicle does not engage 4WD properly. This bulletin involves reprogramming the DTCM with the latest available software.