Chevrolet Silverado 1500 2026 — technical service bulletin
Bulletin 662.30 · NHTSA communication 11035453 · issued Jul 21, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2026
model years
2
vehicle entries
Official summary
• Improvements to reliability when extending the running boards on your vehicle. • Improvements to start reliability and reduced check engine light activation. • Improvements to turbo system diagnostics. • Improves transmission diagnostic software. • Reduces unnecessary check engine light activations.
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.