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Service bulletin Campaign T4C 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 id10167270
Published by NHTSA2019-11-06
Manufacturer's numberCampaign T4C Dea
Manufacturer's date2019-10-28
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Hyundai is conducting a Service Campaign to install a new Air Filter Kit with an updated filter to help prevent DTC P0456 on certain 2017-2019 Ioniq (AE) HEV 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

Engine

Trouble codes named

P0456

Vehicles listed
HYUNDAI IONIQ HYBRID2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)

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
26-EM-016H TSB2026-10-14. Service bulletin. Some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin outlines the combustion chamber cleaning procedure for vehicles diagnosed with this condition. All internal combustion engines consume some engine oil during normal operation, depending on driving conditions and mileage, and this procedure should only be performed when deemed necessary based on inspection and diagnosis of the vehicle as outlined in TSB 26-EM-015H, Engine Oil Consumption – Inspection & Repair Guidelines, or the latest revision.
26-EM-015H TSB2026-10-13. Service bulletin. Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides the inspection and repair procedures for vehicles exhibiting this condition. All internal combustion engines consume engine oil as part of normal engine operation. Oil consumption rates may vary based on mileage, operating conditions, driving habits, and maintenance history. Hyundai recommends following the prescribed maintenance schedule and periodically checking the engine oil level using the dipstick to maintain proper engine oil level.
23-EM-005H2023-12-15. Service bulletin. This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
22-EM-010H2022-08-05. Service bulletin. Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly replacement.
22-HC-001H2022-06-10. Service bulletin. If you are servicing an applicable model with Hybrid Drive Motor (Traction Motor) improper operation or any DTC listed in the related shop manual, Motor Control System, refer to the shop manual for diagnosis. If the diagnosis indicates a faulty hybrid drive motor, refer to the Service Procedure and replace the hybrid drive motor.
21-EM-004H2021-04-07. Service bulletin. This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps.
21-EM-003H2021-04-06. Service bulletin. This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.
20-FL-012H2021-01-09. Service bulletin. This bulletin provides information related to the Engine Control Module (ECM) software logic update for DTC P0128 “Coolant thermostat - Coolant temp Below thermostat regulating Temperature”. There is no drivability issue with this DTC.
20-01-049H2021-01-09. Service bulletin. This bulletin provides information related to the Engine Control Module (ECM) software update for OBD communication test logic, and for DTC P0128 “Coolant thermostat - Coolant temp Below thermostat regulating Temperature”. There are no drivability related conditions.
20-EE-001H-12020-09-03. Service bulletin. The following summarizes the procedure for EV battery replacement: