Buick TSB #GCUS-3-778
2017 Buick LaCrosse
TSB Document:
Affected Component: ELECTRICAL SYSTEM
- Summary
- 16159 Service Update. On certain vehicles with an 8-speed transmission (MRC), under certain downhill driving conditions, these vehicles may inappropriately remain in a mode of delayed upshifts that can only be exited on an ignition key cycle or gear selector shift to neutral. Dealers are to reprogram the transmission control module.
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