Chevrolet Silverado 2001–2004 — technical service bulletin
Bulletin 01856 · NHTSA communication 10006712 · issued Jan 1, 2004
Technical service bulletin
communication type
Power Train
component
2001–2004
model years
8
vehicle entries
Official summary
Allison lct1000 will not shift from park due to ice, snow or mud build-up on shift linkage. *mr
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.