Chevrolet Trailblazer 2021–2026 — technical service bulletin
Bulletin PIC6589B · NHTSA communication 11035696 · issued Jul 31, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2021–2026
model years
6
vehicle entries
Official summary
This Preliminary information communicates to the techicians a diagnostic tip if a customer has a complaint of a whistle/wind noise at highway speeds.
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.