PI 2019–2026 Sierra 1500/Sierra 2500HD Unknown or Other — PIT5909

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Preliminary information · Preliminary information PIT5909

This is a preliminary information note, not a recall. GMC sends these to dealer technicians about a known condition, often while a fix is still being worked out. They are not repair orders, and they don't by themselves change what is covered.

Published: Nov 3, 2026
Applies to: Sierra 1500: 2019–2026 · Sierra 2500HD: 2020–2026

Also listed in the source (outside this forum's coverage): Hummer EV Pickup 2022–2026, Hummer EV SUV 2024–2026

Summary (official text)​

This Preliminary information communicates that it is normal for the tailgate to drop faster than it used to after the GM Accessory Kicker Audio System is installed.

Sources​

• PIT5909D (PDF, NHTSA document 11039882) — Nov 3, 2026

Details from NHTSA as of Nov 11, 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.

Have you experienced this issue with your truck? Let us know your model year and engine, plus any diagnosis or repair details.

 

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