# Service bulletin KC\-379

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: 10207406
- Published by NHTSA: 2022\-02\-04
- Manufacturer's number: KC\-379
- Manufacturer's date: 2022\-01\-18
- NHTSA component: SERVICE BRAKES, AIR

## NHTSA's summary

Engine Brake \- Diagnostic Trouble Code \(DTC\) P1021\-11 Volvo Compression Brake \(VCB\) Control Circuit Short To Ground \- US17\+OBD16 Through US17\+OBD19 Emissions, Model Years 2018 To 2020

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10207406-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10207406-9999.pdf)

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

## Components

Brakes

## Trouble codes named

P1021

## Vehicles listed

- 2018 to 2020 VOLVO VAH
- 2018 to 2020 VOLVO VHD
- 2018 to 2020 VOLVO VN
- 2018 to 2020 VOLVO VNL
- 2018 to 2020 VOLVO VNM
- 2018 to 2020 VOLVO VNR
- 2018 to 2020 VOLVO VNX

JSON: [/v1/bulletins/10207406](/v1/bulletins/10207406)

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