LCT1000 PRNDL Inoperative or Reads Incorrect, Possible DTCs after Installation of New NSBU - adjust Allison automatic engage P0708 P0847 P0872 P0875 P1711 P1713 shift slip switch transmission

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

After the installation of an NSBU switch, the PRNDL may be inoperative, read incorrect for the selected gear range, difficult to adjust or the following DTCs may be set P0708, P0847, P0872, P0875, P1711, and P1713. You may notice that the new NSBU switch was difficult to install and could not be pushed onto the selector shaft by hand. The selector shaft is mushroomed on the threaded end. Once the NSBU switch is forced over the mushroomed selector shaft the switch boss is enlarged and will not fit the selector shaft properly.

The selector shaft should be filed with a flat file to remove the mushroomed surface and new NSBU switch should be installed on the transmission using only hand pressure.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.