Chevrolet Silverado 1500 2026 — technical service bulletin
Bulletin 663.20 · NHTSA communication 11036478 · issued Aug 24, 2026
Technical service bulletin
communication type
Unknown / Other
component
2026
model years
2
vehicle entries
Official summary
This update contains a required software change to help improve the overall software update and diagnostics process. Be sure to install this update to be able to receive future software updates.
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.