Chevrolet Silverado 1500 2019–2021 — technical service bulletin
Bulletin PIT6451 · NHTSA communication 11025585 · issued Nov 12, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2019–2021
model years
9
vehicle entries
Official summary
This PI communicates information that Engineering is aware of concern and working to correct false Service Trailer Turn Signal Message when operating the power tailgate with no trailer connected.
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.