Service campaign 25-01-042H TSB

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)
Type	Service campaign
NHTSA id	11020692
Published by NHTSA	2025-07-15
Manufacturer's number	25-01-042H TSB
Manufacturer's date	2025-07-08
Campaign id or software version	TDR
NHTSA component	POWER TRAIN

NHTSA's summary

Certain 2024MY Kona Electric (SX2 EV) and 2023-2024MY IONIQ 5 (NE EV) vehicles are equipped with a Motor and Reduction Gear System, also known as Motor-Gear Driven Unit (MGDU), that may have received an incorrect amount of oil/fluid during manufacturing. In some cases, the motor and/or reduction gear can produce a grinding/whining noise during operation. Follow the procedures in this bulletin to drain the existing oil and replace it with new oil to resolve this condition.

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

Transmission and driveline

Vehicles listed
HYUNDAI IONIQ 5	2023, 2024
HYUNDAI KONA ELECTRIC	2024 (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.

Recalls for the same vehicles and component
2024062	2024-02-01. Powertrain
24V065000	2024-02-01. POWER TRAIN:DRIVELINE:DRIVESHAFT

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
24-AT-002H	2024-04-16. Service bulletin. This TSB provides a procedure to diagnose and replace, if necessary, an automatic transmission with Incorrect Ratio DTC (transmission clutch slip in gear above limit) listed on Page 2.
24-EV-003H	2024-04-02. Service bulletin. Certain 2022-2024 MY IONIQ 5 (NE1) and 2023MY IONIQ 6 (CE1) may have a condition of the power down warning light (turtle symbol) with "Power is limited" displayed in the cluster, and possible DTC P0A2F. If you are servicing a vehicle with either of these conditions, follow this bulletin to inspect the EOP.
23-01-067H-1	2023-11-07. Service bulletin. Updated Vehicle Control Unit (VCU) software relating to the brake light logic for regenerative braking on certain IONIQ 5 Electric (NE1) & IONIQ 6 (CE1) vehicles is now available to improve the vehicle’s system logic and performance. An “Owner’s Manual Supplement” leaflet is also to be provided to 2022MY IONIQ 5 vehicle customers to explain the change & application of the Electronic Parking Brake (EPB) system of their vehicle.
23-01-067H-1	2023-11-07. Service bulletin. This updated Vehicle Control Unit (VCU) software package includes the following: • Brake light logic update for regenerative braking. • i-Pedal mode operation logic update. • 12V battery saver logic update allows charging from EV Battery as low as 10% SOC when parked. The Ioniq 5 update includes these earlier items that Ioniq 6 had included from start of production: • EPB (Electronic Parking Brake) auto engagement when shift into Park/auto disengagement shift out of Park when shifting to D or R while brake pedal is engaged. • DTE (Distance to Empty) strategy. • Snow road surface performance. • Air conditioning performance during AC slow charging. • Enhance charging sequence.
23-EV-006H	2023-09-06. Service bulletin. This bulletin provides service information on how to inspect the charging port and if needed, replace any missing/damaged insulation cap(s) at the charging port on certain 2022-2023MY Ioniq 5 (NE1) and 2023MY (CE1) . The charging insulation caps are important to ensure proper charger connector orientation and fit to the vehicle charge port.
23-HA-002H	2023-09-05. Service bulletin. Certain IONIQ 5 (NE1) vehicles may experience an inoperative heater or air conditioning with one or more HVAC system related DTCs B169588, B160C88, and/or B183088. To correct this condition, follow the inspection diagnostics and repair procedure outlined in this bulletin.
23-01-060H	2023-08-02. Service bulletin. Certain 2022-2023MY IONIQ 5 (NE1) and 2023MY IONIQ 6 (CE1) vehicles may exhibit a condition where low 12V auxiliary battery charging occurs due to an ICCU (Intelligent Charging Control Unit) fault which may set the following DTC P1A9096 – “DC/DC Converter Input Voltage Sensor Fault”. When a fault occurs, the vehicle may enter a reduced power mode while various warning lights, an audible chime will sound, and large messaging in the vehicle’s instrument cluster will appear, instructing the driver to stop the vehicle. The vehicle will be inspected for a DTC P1A9096 and may require either an ICCU software update or ICCU replacement and potential fuse replacement (if fuse is blown when inspected).
23-01-060H	2023-08-02. Service bulletin. Certain 22-23MY Ioniq 5 (NE1) & 23MY Ioniq 6 (CE1) vehicles may have a condition where low 12V auxiliary battery charging occurs due to an ICCU (Intelligent Charging Control Unit) fault and may set the following DTC P1A9096 – “DC/DC Converter Input Voltage Sensor Fault”. When a fault occurs, the vehicle may enter a reduced power mode while various warning lights, an audible chime will sound, and large messaging in the vehicle’s instrument cluster will appear and instruct the driver to stop the vehicle. The Service Procedure flow to be followed is outlined by the flowchart on Page-3. The ICCU system is to be checked by GDS for DTC P1A9096 and depending on the result, will involve either an ICCU software update, or ICCU and potential fuse replacement. Only replace the fuse after it is inspected to confirm to be blown/open.
23-01-039H	2023-07-01. Service bulletin. This bulletin applies the following continuous improvements from a Vehicle Control Unit (VCU) Software Update. An “Owner’s Manual Supplement” leaflet is to be provided to 2022MY vehicle customers to explain the change it makes to the Electronic Parking Brake (EPB) system. (NOTE: 2023MY vehicle Owner’s Manual already contains the EPB supplement content). • Enhance i-Pedal mode operation. • EPB (Electronic Parking Brake) auto engagement when shift into Park/auto disengagement shift out of Park when shifting to D or R while brake pedal is engaged. • DTE (Distance to Empty) strategy. • Snow road surface performance. • Air conditioning performance during AC slow charging. • Enhance charging sequence.
23-EV-003H	2023-04-04. Service bulletin. If you are servicing a vehicle with either of the following conditions perform the procedure in this Bulletin to update VCMS software. • Intermittently stops charging before charging completes. • EV Light On with DTC P1BAD “Charger Coupler Temperature Too High”.