Expand the Inspection on These Buick Codes

Several Buick models may have the MIL on accompanied by DTC U0101 as current or in history. But investigation of these vehicles recently has shown that the condition is frequently caused by issues other than the control solenoid/module assembly. Here are the areas to check before replacing any parts.

Information courtesy of Mitchell 1

Mike Mavrigian

July 12, 2022

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This bulletin applies to 2016-2017 Buck Cascada, 2013-2017 Encore, 2010-2016 LaCrosse, 2011-2017 Regal and 2012-2017 Verano vehicles. The MIL may be on accompanied by DTC U0101 as current or in history.

Investigation of several recent vehicles setting this DTC has shown that this condition is frequently caused by issues other than the control solenoid/module assembly (TEHCM). Prior to replacing any parts, several areas should be inspected:

Transmission connector pins for damaged terminals or poor terminal fit.
Underhood fuse block for damaged terminals/poor terminal fit and mis-positioned fuses.
TCM ground. Refer to automatic transmission controls schematics to determine the ground identification (G106, G107, etc.), then the master electrical component list to determine ground location.
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 ay sharp objects, mainly on top of the transmission where a harness can contact a sharp edge on the engine block.

ART: BUICK (courtesy GM)

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.