PI 2026–2027 Yukon/Yukon XL DTC — PIT6554

[AT4Forum]

Preliminary information · Preliminary information PIT6554

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 2, 2026
Applies to: Yukon, Yukon XL (2026–2027 model years)

Also listed in the source (outside this forum's coverage): Hummer EV Pickup 2027, Hummer EV SUV 2027, Sierra EV 2027

Summary (official text)​

This preliminary information is to help technicians decide if the DTC needs to be diagnosed if relating to the concern and if it is not, the DTC can be ignored.

Sources​

• PIT6554 (PDF, NHTSA document 11038164) — Oct 2, 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.

 

AT4 Forum Fav 👍

Air Lift 89388 LoadLifter 5000 Ultimate Plus Air Suspension Kit - Grab one through Amazon!