Over-the-air update 662.21
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 | 11035451 |
| Published by NHTSA | 2026-08-01 |
| Manufacturer's number | 662.21 |
| Manufacturer's date | 2026-07-30 |
| Campaign id or software version | 662.21 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | IPC: IPC (Instrument Panel Cluster) |
NHTSA's summary
Improvements to accuracy for Diesel Exhaust Fluid level shown in driver display.
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.
| CHEVROLET SILVERADO 2500 | 2026 (the catalog's model; the bulletin names a series or trim of it) |
|---|---|
| GMC SIERRA 2500 | 2026 (the catalog's model; the bulletin names a series or trim of it) |
Listing a model year does not mean every vehicle of it is concerned: the document says which.