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Service bulletin 20-01-027H

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 id10177133
Published by NHTSA2020-07-08
Manufacturer's number20-01-027H
Manufacturer's date2020-06-22
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT; ENGINE AND ENGINE COOLING

NHTSA's summary

This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak.

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

Electrical system, Engine, Equipment and accessories, Software

Trouble codes named

P0456

Vehicles listed
HYUNDAI SONATA2020

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

Recalls for the same vehicles and component
20V2130002020-04-09. ELECTRICAL SYSTEM:SOFTWARE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
21-01-009H2021-03-05. Service bulletin. This bulletin provides information related to an Electronic Control Module (ECM) software update which revises detection logic for DTC P2422: EVAP System Restricted Vent Valve logic.
20-01-031H-12020-08-07. Service bulletin. This bulletin describes the procedure to program the NFC Card only when no other NFC card has been paired to the vehicle previously.
Campaign T5A Dea2020-07-08. Service bulletin. This service campaign information is related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak. This Service Campaign T5A will replace Service Campaign T4N.