Over-the-air update 663.20
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.
| Type | Over-the-air update |
|---|---|
| NHTSA id | 11036469 |
| Published by NHTSA | 2026-08-31 |
| Manufacturer's number | 663.20 |
| Manufacturer's date | 2026-08-27 |
| Campaign id or software version | 663.20 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | EBCM, TCM: "EBCM (Electronic Brake Control Module), TCM (Transmission Control Module)" |
NHTSA's summary
• Improves transmission diagnostic software. • Reduces unnecessary check engine light activations. • Improved braking performance and reduced unnecessary messages and alerts
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.
| CADILLAC ESCALADE | 2026 |
|---|---|
| CADILLAC ESCALADE ESV | 2026 |
| CHEVROLET SUBURBAN 1500 | 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET TAHOE | 2026 |
| GMC YUKON | 2026 |
| GMC YUKON XL | 2026 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.