PI 2026 Sierra 2500HD/Sierra 3500HD Engineering Is Working on a Resolution — PIT6553

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Preliminary information · Preliminary information PIT6553

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 26, 2026
Applies to: Sierra 2500HD, Sierra 3500HD (2026 model year)

Summary (official text)​

This Preliminary information communicates that Engineering is working on a resolution and no parts should be replaced at this time.

Sources​

• PIT6553 (PDF, NHTSA document 11037558) — Sep 26, 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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