TSB: VOLVO VAH, VHD, VN, VNL, VNM, VNR, VNX (2018–2020)

Bulletin KC-379 — January 18, 2022

Bulletin Details

Bulletin IDKC-379
ManufacturerVOLVO
ModelsVAH, VHD, VN, VNL, VNM, VNR, VNX
Model Years2018–2020
Date IssuedJanuary 18, 2022
Date Added to NHTSAFebruary 3, 2022
ComponentSERVICE BRAKES, AIR
Vehicles Affected21 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

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

Affected Vehicles

MakeModelYearComponent
VOLVO VAH 2020 040000 SERVICE BRAKES, AIR
VOLVO VHD 2020 040000 SERVICE BRAKES, AIR
VOLVO VN 2020 040000 SERVICE BRAKES, AIR
VOLVO VNL 2020 040000 SERVICE BRAKES, AIR
VOLVO VNM 2020 040000 SERVICE BRAKES, AIR
VOLVO VNR 2020 040000 SERVICE BRAKES, AIR
VOLVO VNX 2020 040000 SERVICE BRAKES, AIR
VOLVO VAH 2019 040000 SERVICE BRAKES, AIR
VOLVO VHD 2019 040000 SERVICE BRAKES, AIR
VOLVO VN 2019 040000 SERVICE BRAKES, AIR
VOLVO VNL 2019 040000 SERVICE BRAKES, AIR
VOLVO VNM 2019 040000 SERVICE BRAKES, AIR
VOLVO VNR 2019 040000 SERVICE BRAKES, AIR
VOLVO VNX 2019 040000 SERVICE BRAKES, AIR
VOLVO VAH 2018 040000 SERVICE BRAKES, AIR
VOLVO VHD 2018 040000 SERVICE BRAKES, AIR
VOLVO VN 2018 040000 SERVICE BRAKES, AIR
VOLVO VNL 2018 040000 SERVICE BRAKES, AIR
VOLVO VNM 2018 040000 SERVICE BRAKES, AIR
VOLVO VNR 2018 040000 SERVICE BRAKES, AIR
VOLVO VNX 2018 040000 SERVICE BRAKES, AIR

Related VOLVO Recalls

CampaignModelYearComponentSummary
VNL (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Volvo Trucks North America (Volvo Trucks) is recalling certain 2026-2027 VNR ...
VNL (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Volvo Trucks North America (Volvo Trucks) is recalling certain 2026-2027 VNR ...
VNR (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Volvo Trucks North America (Volvo Trucks) is recalling certain 2026-2027 VNR ...
VNL (4) 2025 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Volvo Trucks North America (Volvo Trucks) is recalling certain 2026-2027 VNR ...
VNR (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Volvo Trucks North America (Volvo Trucks) is recalling certain 2026-2027 VNR ...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized VOLVO dealer. Bring this bulletin ID (KC-379) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.