2021-2022 Hyundai MDPS Worm Shaft Bearing Noise TSB

Owners of certain 2017-2022 Hyundai vehicles, including the 2021-2022 Hyundai Ioniq 5, Kona, and Palisade, may notice a bearing noise emanating from the Motor Driven Power Steering (MDPS) column worm shaft assembly. Hyundai has issued Technical Service Bulletin (TSB) 22-ST-005H to address this specific concern, providing a detailed procedure for diagnosing and repairing the "C-MDPS WORM SHAFT BEARING NOISE" by replacing the worm shaft bearing.

This TSB, identified as 22-ST-005H, supersedes an earlier bulletin, 21-ST-003H, specifically to remove Sonata (DN8A) vehicles from its scope, as a separate TSB has been issued for those models. If you experience a bearing noise, this bulletin guides technicians through the necessary steps to resolve the issue.

Symptoms

The primary symptom of this issue is a distinct bearing noise originating from the MDPS column and housing. This noise is typically heard near the C-MDPS motor on the steering column. To confirm the noise, a technician will start the engine and turn the steering wheel left and right, listening for the specific sound from the worm shaft housing. Hyundai provides a YouTube link (https://youtu.be/22PI3hAEfnk) for technicians to hear an example of the bearing noise.

Diagnosis / Trigger Conditions

Diagnosis involves actively listening for the bearing noise while operating the steering wheel. If the noise is present, the repair procedure outlined in TSB 22-ST-005H should be followed. If no noise is detected in this specific location, technicians are instructed to refer to the shop manual for general diagnostic procedures or consult TSB 20-ST-001H-2, which provides information on Column-Mounted MDPS Repair.

Important Warnings

Several critical safety warnings are highlighted in TSB 22-ST-005H for technicians performing this repair:

• Battery Disconnection: The negative (-) battery terminal must be disconnected before starting work. Technicians are instructed to wait at least 3 minutes after disconnection to ensure voltage is bled off. Failure to remove the negative terminal can result in accidental airbag deployment and potential physical injury.
• Airbag Handling: If the vehicle is equipped with a driver's knee airbag, it must be carefully removed according to the shop manual. After removal, the knee airbag module must be positioned with the cover facing upward to prevent accidental deployment and possible physical injury.
• Bearing Reinstallation: If the new bearing is removed at any point during the installation procedure, it must not be reinstalled. A new bearing must be used instead, as the removed bearing might be damaged and could cause a noise.
• Tool Usage: Only hand tools should be used when seating the bearing. Electric tools may damage the bearing during assembly.

Repair Procedure Summary

The repair process involves replacing the small bearing within the MDPS column worm shaft assembly. Here's a summary of the key steps:

1. Preparation: Record the customer's radio preset stations. Disconnect the negative battery terminal and wait for three minutes.
2. Access: Remove any necessary parts, including the driver's knee airbag if equipped, to gain access to the small bearing. The MDPS assembly itself does not need to be removed.
3. Disassembly: Remove the plug (or plastic cover for Sonata Hybrid DN8 HEV models), anti-rattle plug, anti-rattle spring, and slide pin. The sliding damper is removed and discarded.
4. Bearing Removal: Use the specialized MDPS Small Bearing Removal Tool (part number 0K563-L2100FFF) to extract and discard the old bearing.
5. Grease Removal: Use the supplied paper stick to remove any excess grease.
6. Bearing Installation: Insert the new small bearing from the SMALL BEARING KIT (part number 56359-L1AAAFFF) into the bearing holder. Use the MDPS Small Bearing Mounting Tool (part number 0K563-L2200FFF) to slowly seat the bearing into position on the worm shaft using a torque wrench. Specific torque values are provided, with an increased torque if the bearing does not seat properly initially.
7. Reassembly: Install the new sliding damper, ensuring correct alignment. Reinstall all previously removed parts in reverse order.
8. Final Steps: Reconnect the negative battery cable and reprogram the customer's radio presets if necessary.

Required Tools or Parts

To perform this repair, specific parts and special service tools (SSTs) are required:

• Small Bearing Kit: Part Number 56359-L1AAAFFF. This kit includes the end cover assembly, sliding damper, bearing, and a paper stick. Note that for Sonata Hybrid (DN8 HEV) models, the end cover is specifically required.
• MDPS Small Bearing Removal Tool: Part Number 0K563-L2100FFF.
• MDPS Small Bearing Mounting Tool: Part Number 0K563-L2200FFF.

Hyundai notes that dealers were provided with one of each special tool at the launch of the original TSB in October 2021.

Warranty Information

For warranty claims related to this repair, dealers should use the following codes:

• Operation Code: 56352F00
• Operation Time: 0.6 M/H (Man-Hours)
• Causal Part: 56359-L1AAAFFF
• Nature Code: Q57
• Cause Code: ZZ6

Owner Action

If you notice a bearing noise coming from your steering column, particularly when turning the steering wheel, it is recommended to contact your authorized Hyundai dealership. Inform them of the symptoms and mention TSB 22-ST-005H. The dealership will be able to diagnose the issue and perform the necessary repair, which involves replacing the MDPS column worm shaft bearing.

NHTSA ID: 10211678