# Over\-the\-air update 662.20

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: 11036470
- Published by NHTSA: 2026\-08\-31
- Manufacturer's number: 662.20
- Manufacturer's date: 2026\-08\-08
- Campaign id or software version: 662.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: ARB, BCM, ECM: ARB \(Articulated Running Boards\), BCM \(Body Control Module\), ECM \(Engine Control Module\)

## NHTSA's summary

• Improvements to active cabin ventilation • Additional protection for the health of your battery • Improvements to the software update system • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes for accuracy of low tire pressure alert. • Fixes for speed threshold for pedestrian alerts. • Improvements to help reduce check engine light activation and emissions system messages. • Improves behavior of aero shutter system in freezing temperatures • Improvements to reliability when extending the running boards on your vehicle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036470-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036470-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Vehicles listed

- 2025 CHEVROLET SILVERADO 2500
- 2025 GMC SIERRA 2500

JSON: [/v1/bulletins/11036470](/v1/bulletins/11036470)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Over-the-air%20update%20662.20&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11036470&vehicle=Over-the-air%20update%20662.20)