GMC Sierra 2014–2015 — technical service bulletin
Bulletin PIT5374 · NHTSA communication 10057992 · issued Mar 1, 2015
Technical service bulletin
communication type
Exterior Lighting
component
2014–2015
model years
4
vehicle entries
Official summary
General motors 2014-2015 gmc sierra, gmc sierra 1500: information regarding poor headlight performance when driving in very dark rural areas. *lj
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.