PI 2026–2027 Yukon/Yukon XL Of a Service Theft Message After Using the Rear Window Defogger — PIT6551

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Preliminary information · Preliminary information PIT6551

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 22, 2026
Applies to: Yukon, Yukon XL (2026–2027 model years)

Summary (official text)​

This preliminary information communicates an issue with of a service theft message after using the rear window defogger. Engineering is currently investigating.

Sources​

• PIT6551 (PDF, NHTSA document 11037553) — Sep 22, 2026
• PIT6551A (PDF, NHTSA document 11038133) — Sep 28, 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 vehicle? Let us know your model year and engine, plus any diagnosis or repair details.

 

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