Buick Ground Issue
This bulletin applies to 2010-2011 Buick Allure, 2016-2017 Cascada, 2013-2017 Encore, 2010-2016 LaCrosse, 2011-2017 Regal and 2012-2017 Verano vehicles, regarding DTC U0101 being set.
Check the underhood fuse block for damaged terminals or poor terminal fit and mis-positioned fuses in the fuse block. Inspect the TEHCM grounds (refer to service manual automatic transmission controls schematic to determine ground identification... G106, G107, etc.), then the master electrical component list to determine the location of the ground.
Powers and grounds should always be load checked to make sure the circuits are able to work properly. Check the harness for rubbing through on any sharp objects, mainly on top of the transmission where the harness can contact sharp areas on the block. Inspect transmission connector pins for damaged terminals or poor terminal fit.
After inspection is complete, reconnect using dielectric grease.