Service bulletins for the 2021 Hyundai Ioniq
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.
33 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Transmission and driveline are shown. Show all
| 23-01-072H | 2023-10-02. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides the procedure to update the Hybrid Control Unit (HCU) / Low DC/DC Converter (LDC) software logic to eliminate internal P-DTCs (that are not viewable) in certain 2019-2021MY IONIQ Hybrid (AE HEV) and 2021MY IONIQ Plug-in Hybrid (AE PHEV) vehicles. |
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| 23-01-049H | 2023-06-30. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. This bulletin provides instructions to correct a condition with BSC-1 blue coolant flow restriction by debris causing abnormal high EWP (electric water pump) speed in certain 2020-21MY Ioniq Electric (AE EV) and 2019-22 Kona Electric (OS EV) models. Vehicle symptoms may include "Coolant supplement” or “Refill Inverter Coolant" warning light On. No related DTC are found stored. Normal inverter coolant reservoir tank level is confirmed. Special tools are required for this campaign to flush and clean debris from different cooling system circuits. The coolant will be replaced by updated BSC-2 low conductivity blue coolant. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.