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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10207406
Published by NHTSA2022-02-04
Manufacturer's numberKC-379
Manufacturer's date2022-01-18
NHTSA componentSERVICE 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

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.

Components

Brakes

Trouble codes named

P1021

Vehicles listed
VOLVO VAH2018 to 2020
VOLVO VHD2018 to 2020
VOLVO VN2018 to 2020
VOLVO VNL2018 to 2020
VOLVO VNM2018 to 2020
VOLVO VNR2018 to 2020
VOLVO VNX2018 to 2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.