Service bulletin PIT6401
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 | Service bulletin |
|---|---|
| NHTSA id | 11019846 |
| Published by NHTSA | 2025-06-30 |
| Manufacturer's number | PIT6401 |
| Manufacturer's date | 2025-06-19 |
| NHTSA component | UNKNOWN OR OTHER |
NHTSA's summary
This Preliminary information communicates a diagnostic tip on how to resolve a issue of the horn sounding when vehicle doors are being closed and the key in vehicle reminder set to off.
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.
| BRIGHTDROP EV600 | 2022 |
|---|---|
| BRIGHTDROP ZEVO 400 | 2024 (the catalog's model; the bulletin names a series or trim of it) |
| BRIGHTDROP ZEVO 600 | 2023, 2024 (the catalog's model; the bulletin names a series or trim of it) |
| BUICK ENVISION | 2021, 2022, 2023, 2024, 2025, 2026 |
| CADILLAC CT4 | 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| CADILLAC CT5 | 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| CADILLAC ESCALADE | 2021, 2022, 2023, 2024, 2025, 2026 |
| CADILLAC ESCALADE ESV | 2025, 2026 |
| CADILLAC ESCALADE IQ | 2025, 2026 |
| CADILLAC LYRIQ | 2023, 2024, 2025, 2026 |
| CADILLAC OPTIQ | 2025, 2026 |
| CADILLAC VISTIQ | 2026 |
| CADILLAC XT4 | 2024, 2025 |
| CHEVROLET BLAZER EV | 2024, 2025 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET BRIGHTDROP 400 | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET BRIGHTDROP 600 | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET COLORADO | 2023, 2024, 2025, 2026 |
| CHEVROLET EQUINOX | 2025, 2026 |
| CHEVROLET EQUINOX EV | 2024, 2025 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 1500 | 2022, 2023, 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 2500 | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 3500 | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO EV | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SUBURBAN | 2021, 2022, 2023, 2024 |
| CHEVROLET SUBURBAN 1500 | 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET TAHOE | 2021, 2022, 2023, 2024, 2025, 2026 |
| CHEVROLET TRAVERSE | 2024, 2025 |
| GMC ACADIA | 2024, 2025 |
| GMC CANYON | 2023, 2024, 2025 |
| GMC HUMMER EV PICKUP | 2022, 2023, 2024, 2025, 2026 |
| GMC HUMMER EV SUV | 2026 |
| GMC SIERRA 1500 | 2022, 2023, 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 2500 | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 3500 | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA EV | 2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it) |
| GMC TERRAIN | 2025, 2026 |
| GMC YUKON | 2021, 2022, 2023, 2024, 2025, 2026 |
| GMC YUKON XL | 2021, 2022, 2023, 2024, 2025, 2026 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.