Buick Lacrosse 2016–2020 — technical service bulletin
Bulletin PIC6265F · NHTSA communication 10201305 · issued Aug 5, 2021
Technical service bulletin
communication type
Electrical System
component
2016–2020
model years
13
vehicle entries
Official summary
This Preliminary information communicates that a vehicle may exhibit a Adaptive Cruise Control Unavailable and/or Lane Keep Assist Unavailable message. The technician may attempt to program the Active Safety Control Module (ASCM) and encounter a code E4399. The technician is advised if he encounters this concern to zero the MIC counter by placing the vehicle into and back out of "Transport Mode".
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.