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Service bulletin Campaign T4J Dea

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 id10170514
Published by NHTSA2020-01-21
Manufacturer's numberCampaign T4J Dea
Manufacturer's date2019-12-20
NHTSA componentSERVICE BRAKES

NHTSA's summary

Hyundai is conducting a Service Campaign to inspect, and if necessary, re-route the main harness adjacent to the brake booster of certain 2020MY Sonata (DN8) vehicles.

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

Vehicles listed
HYUNDAI SONATA2020

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

Other bulletins for the same vehicles and component
21-BR-002H2021-04-07. Service bulletin. This bulletin provides best practice recommendations when performing brake service procedures.
20-BR-002H2020-12-08. Service bulletin. This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
20-FL-004H2020-06-06. Service bulletin. This bulletin describes the Idle Stop and Go (ISG) system operation, diagnostic and battery sensor recalibration procedure. Refer to applicable Shop Manual and Owner’s Manual for additional information.
19-01-043H2020-01-21. Service bulletin. This bulletin describes the procedure to inspect, and if necessary re-route the main harness adjacent to the brake booster of certain 2020MY Sonata (DN8) vehicles.