# Service bulletin CBR 2443 072025

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: 11021294
- Published by NHTSA: 2025\-08\-04
- Manufacturer's number: CBR 2443 072025
- Manufacturer's date: 2025\-07\-09
- NHTSA component: UNKNOWN OR OTHER; STRUCTURE:BODY

## NHTSA's summary

CBR \- The truck’s trailer detection system uses a brief pulse of compressed air through the red trailer supply line to detect a connected trailer, but this pulse can inadvertently re\-lock air\-actuated tandem slide systems; this procedure outlines a method to mitigate the issue while sliding the trailer tandems.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021294-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021294-9999.pdf)

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

## Components

Body and frame

## Vehicles listed

- 2025 to 2026 VOLVO VNL \(4\)

JSON: [/v1/bulletins/11021294](/v1/bulletins/11021294)

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