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Service bulletins for the 2021 Kia Niro

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.

75 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
TSB_TRA046_R52025-04-23. Service bulletin. POWER TRAIN. TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, and the transmission oil cooler is transferred to the new transmission.
TSB_TRA046_R42024-06-04. Service bulletin. POWER TRAIN. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced.
TSB_TRA046_R32022-12-06. Service bulletin. POWER TRAIN. TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, refer to applicable vehicles in the chart starting on page 2.
TSB_ELE2472021-10-02. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: HCU/LDC LOGIC IMPROVEMENT FOR P-DTC (SA484) - This bulletin provides the procedure to update the software logic of the Hybrid Control Unit/Low Voltage DC/DC Converter (HCU/LDC) system on some 2020-2021MY Niro HEV (DE HEV) and Niro PHEV (DE PHEV) vehicles produced in the date ranges shown below, which may incorrectly set a Power Train Diagnostic Trouble Code (P-DTC).
TSB_TRA0932021-03-04. Service bulletin. POWER TRAIN. TECHNICAL SERVICE BULLETIN: 6-SPEED DCT SHIFT IMPACT/NOISE INSPECTION AND OIL REPLACEMENT - This bulletin provides the inspection method and procedure on some 2019-2020MY Niro (DE HEV/PHEV) vehicles equipped with 6-speed Dual Clutch Transmission (DCT), produced after January 11, 2019, which may exhibit an intermittent noise and/or shift impact. The shift impact may be a noticeable “shift shock”, “clunk”, or other abnormal symptom felt when the vehicle starts after a complete stop.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.