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Over-the-air update 662.11

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeOver-the-air update
NHTSA id11035427
Published by NHTSA2026-08-01
Manufacturer's number662.11
Manufacturer's date2026-07-14
Campaign id or software version662.11
NHTSA componentUNKNOWN OR OTHER
Manufacturer's systemPCM: PO2/PCM (Powertrain Control Module)

NHTSA's summary

• Fixes to help ensure proper functionality for shifting. • Fixes to help protect transmission health. • Improvements to diagnostics to prevent vehicle not starting. • Fixes to help reduce instances of check engine light activation in cold weather.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Vehicles listed
BUICK ENCLAVE2024, 2025
CHEVROLET TRAVERSE2024, 2025
GMC ACADIA2024, 2025

Listing a model year does not mean every vehicle of it is concerned: the document says which.