Chevrolet Suburban 1500 2025 — technical service bulletin
Bulletin 654.40 · NHTSA communication 11033766 · issued Jun 2, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2025
model years
4
vehicle entries
Official summary
• Fixes to help protect battery health. • Improvements to traction while driving on difficult terrain and using Four-Wheel Drive Low.
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.