# Service bulletin PIT6474A

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: 11029443
- Published by NHTSA: 2026\-03\-03
- Manufacturer's number: PIT6474A
- Manufacturer's date: 2026\-02\-27
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

This PI addresses an issue where the customer may experience a loss of brake assist, accompanied by numerous MILs and warnings, after the engine has started, caused by a drop in battery voltage to the Brake System Control module. Dealers are to clean and tighten battery cable connections, test the vehicle battery and charging system, and update the Brake System control module with updated software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029443-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029443-9999.pdf)

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

## Vehicles listed

- 2022 to 2024 CHEVROLET SILVERADO 1500
- 2022 to 2024 GMC SIERRA 1500

JSON: [/v1/bulletins/11029443](/v1/bulletins/11029443)

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