PI 2022–2026 Sierra 1500/Sierra 2500HD/Sierra 3500HD Diagnostic Tip for the Tailgate Release System and Tailgate Ajar… — PIT6543

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Preliminary information · Preliminary information PIT6543

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: Sep 3, 2026
Applies to: Sierra 1500: 2022–2026 · Sierra 2500HD: 2024–2026 · Sierra 3500HD: 2024–2026

Summary (official text)​

This preliminary information communicates a diagnostic tip for the tailgate release system and tailgate ajar message.

Sources​

• PIT6543 (PDF, NHTSA document 11037255) — Sep 3, 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.

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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