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Over-the-air software update · 662.20
This is an over-the-air software update notice. GMC filed it with NHTSA to describe a software release; it is not a recall unless it says so. Delivery depends on your truck's connectivity and settings.
Published: Aug 8, 2026
Applies to: Sierra 1500: 2023 · Sierra 2500HD: 2025
Details from NHTSA as of Oct 22, 2026. If NHTSA or GMC revises this notice, this post is updated and significant changes are noted in a reply. The linked documents are the authority, and a dealer can confirm whether it applies to your VIN.
Has this update reached your truck? Share your model year and anything that changed after it installed.
This is an over-the-air software update notice. GMC filed it with NHTSA to describe a software release; it is not a recall unless it says so. Delivery depends on your truck's connectivity and settings.
Published: Aug 8, 2026
Applies to: Sierra 1500: 2023 · Sierra 2500HD: 2025
Summary (official text)
Sources
- 662.20 (PDF, NHTSA document 11036470) — Aug 8, 2026
- 662.20 (PDF, NHTSA document 11037763) — Sep 8, 2026
Details from NHTSA as of Oct 22, 2026. If NHTSA or GMC revises this notice, this post is updated and significant changes are noted in a reply. The linked documents are the authority, and a dealer can confirm whether it applies to your VIN.
Has this update reached your truck? Share your model year and anything that changed after it installed.
