PI 2027 Sierra 1500 Dealers That the 2027 5.7L (L76) and 6.6L (L78) Engines Are on an… — PIP6136

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Preliminary information · Preliminary information PIP6136

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: Oct 15, 2026
Applies to: Sierra 1500 (2027 model year)

Restrictions stated in the source:

• Engine: 6.6L

Summary (official text)​

This Preliminary Information informs dealers that the 2027 5.7L (L76) and 6.6L (L78) engines are on an exchange program. Dealers are instructed to contact the Product Quality Center to order an engine assembly.

Sources​

• PIP6136 (PDF, NHTSA document 11038589) — Oct 15, 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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