This bulletin applies to 2012-2017 Buick Regal models. Some customers may comment that the check engine light is illuminated. In “rare” cases, they may also comment that there is no PRNDL display. When checking for DTCs, technicians may find P182E set as active or history in the transmission control module (TCM).
1. Verify proper shift cable adjustment.
2. Verify proper ECM Park/Neutral switch status in all ranges.
3. Verify proper internal mode switch (IMS) A/B/C/P parameters in all ranges.
4. Operate the vehicle within the conditions for running the DTC and freeze frame/failure records data in an attempt to duplicate the DTC. If the DTC does not re-set, replace the IMS (lever, manual shift detent with shaft position switch assembly). If the DTC does reset, complete the circuit/system testing steps. If DTC U0101 is set as active or history in the electronic brake control module, it should be ignored, as it has been found to be falsely setting.