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Service bulletin 21-ST-001H

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 id10186825
Published by NHTSA2021-02-06
Manufacturer's number21-ST-001H
Manufacturer's date2021-01-28
NHTSA componentSTEERING

NHTSA's summary

The rack-mounted dual pinion Motor Driven Power Steering (MDPS) system components can be replaced separately from the complete assembly. This bulletin provides information on the separate components and the replacement procedure of these components.

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

Steering

Vehicles listed
HYUNDAI SONATA2015, 2016, 2017, 2018, 2019, 2020, 2021
HYUNDAI VELOSTER2019, 2020, 2021

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

Recalls for the same vehicles and component
14V3250002014-06-12. ELECTRICAL SYSTEM:WIRING; STEERING

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
23-ST-003H2023-05-03. Service bulletin. The warranty coverage for certain 2015-2017MY Sonata (LFa) and Sonata Hybrid/Plug-in (LF HEV/PHEV) vehicles exhibiting reduced power steering assist and/or motor driven power steering (MDPS) warning lamp has been extended to 15 years or 150,000 miles from the date of original retail delivery or date of first use, whichever occurs first. Refer to the TSB 23-ST-003H (or latest version) for warranty, service parts information, and diagnostic information outlined in the bulletin.
23-ST-003H2023-05-02. Service bulletin. The warranty coverage for certain 2015-2017MY Sonata (LFa) and Sonata HEV/PHEV (LF HEV/PHEV) vehicles exhibiting reduced power steering assist and/or motor driven power steering (MDPS) warning lamp has been extended to 15 years or 150,000 miles from the date of original retail delivery or date of first use, whichever occurs first. Refer to the warranty, service parts information, and diagnostic information outlined in this bulletin.
218/231 amend2022-07-09. Service bulletin. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.
22-ST-007H2022-06-10. Service bulletin. N Vehicles are designed to maximize dynamic steering performance. In normal Ackerman steering geometry, the inner front tire turns more than the outer tire to help cornering in low-speed situations, i.e., parking lot maneuvering or sharp U-turns. N vehicles have a steering geometry optimized for performance driving. The N vehicle’s steering angle difference between the front wheels is reduced to enhance cornering performance. While this helps in high performance driving conditions, it can cause a higher level of tire side scrub that may create a slow shudder or vibration while turning at full steering lock. The feel is similar to turning a 4WD vehicle on dry asphalt when locked in 4WD. This shudder or vibration at parking lot speeds is normal, and no repairs should be performed.
22-ST-005H2022-05-10. Service bulletin. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.
22-ST-005H2022-05-10. Service bulletin. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.
22-ST-003H2022-05-10. Service bulletin. Certain 2020-2022MY Sonata (DN8A) vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.
22-ST-001H2022-02-08. Service bulletin. The warranty coverage for certain 2015-2017MY Sonata (LFa) and Sonata HEV/PHEV (LF HEV/PHEV) vehicles exhibiting reduced power steering assist and/or motor driven power steering (MDPS) warning lamp has been extended to 15 years or 150,000 miles from the date of original retail delivery or date of first use, whichever occurs first. Refer to the warranty, service parts information, and diagnostic information outlined in this bulletin.
TXXO DBP2022-02-08. Service bulletin. The warranty coverage for certain 2015-2017MY Sonata (LFa) and Sonata Hybrid/Plug-in (LF HEV/PHEV) vehicles exhibiting reduced power steering assist and/or motor driven power steering (MDPS) warning lamp has been extended to 15 years or 150,000 miles from the date of original retail delivery or date of first use, whichever occurs first.
21-ST-003H2021-11-06. Service bulletin. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing