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Service bulletin TSBCHA098_R1

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 id10164294
Published by NHTSA2019-09-06
Manufacturer's numberTSBCHA098_R1
Manufacturer's date2019-08-28
NHTSA componentSERVICE BRAKES, HYDRAULIC

NHTSA's summary

TSBCHA098_R1: IBAU SYSTEM REPAIR FOR NOISE AND AIR BLEEDING - This bulletin has been revised to include additional information. This bulletin provides the repair procedure for the Integrated Brake Actuation Unit (iBAU) system on some 2014-2019MY EV/Hybrid/Plug-In Hybrid vehicles listed (see table), which may exhibit a "Honking" (Hissing) noise due to air remaining in the brake fluid system.

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

Brakes

Vehicles listed
KIA NIRO2017, 2018, 2019
KIA NIRO PHEV2018 (the catalog's model; the bulletin names a series or trim of it)
KIA NIRO PLUG-IN HYBRID2019 (the catalog's model; the bulletin names a series or trim of it)
KIA OPTIMA HYBRID2014, 2015, 2016, 2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
KIA OPTIMA PHEV2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
KIA SOUL EV2015, 2016, 2017, 2018, 2019 (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
20250032025-01-07. Brakes
20247602024-12-13. Brakes
20235292023-09-26. Brakes
23V6520002023-09-25. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
21V3310002021-05-10. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20205952020-12-03. Brakes
20V5190002020-08-27. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20193672019-07-25. Brakes

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
SC334_OWNR_2012026-08-21. Service campaign. VOLUNTARY SERVICE CAMPAIGN: OWNER RENOTIFICATION (SC334 Flight 201) - This document is the owner renotification advising that Kia is conducting a Voluntary Service Campaign to inspect and, if necessary, replace the brake line(s) in certain 2014-2019 MY Soul vehicles that were originally sold in or are currently registered in states where heavy amounts of road salt are used. In addition, an anti-corrosion material will be applied to the underbody components for added protection.
TSB_SC334_R12025-09-02. Service bulletin. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN UNDERBODY INSPECTION & ANTI-CORROSION MATERIAL APPLICATION (SC334) - 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 to apply additional anti-corrosion material to underbody components, including inspection/replacement of the brake line(s), on certain 2014-2019MY Soul (PS) vehicles produced from July 21, 2013 through December 24, 2018, and were originally sold or are currently registered in one of the 28 states where heavy amounts of road salt are used. The 28 states where heavy amounts of road salt are used are: AK, CT, DC, DE, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, ND, NE, NH, NJ, NY, OH, PA, RI, SD, UT, VT, WI and WV.
SC321_OWNR_2012025-09-02. Service campaign. VOLUNTARY SERVICE CAMPAIGN: OWNER RENOTIFICATION (SC321) - This document is the owner renotification advising that Kia is conducting a Voluntary Service Campaign to address a potential corrosion concern with the Integrated Electronic Brake (IEB) in certain 2019-2022 MY Niro EV vehicles that were originally sold in or are currently registered in one of the 28 states with high road salt usage.
SC334_TSB2025-06-27. Service campaign. VOLUNTARY SERVICE CAMPAIGN: UNDERBODY INSPECTION & ANTI-CORROSION MATERIAL APPLICATION (SC334) - This bulletin provides information to apply additional anti-corrosion material to underbody components, including inspection/replacement of the brake line(s), on certain 2014-2019MY Soul (PS) vehicles produced from July 21, 2013 through December 24, 2018, and were originally sold or are currently registered in one of the 28 states where heavy amounts of road salt are used: AK, CT, DC, DE, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, ND, NE, NH, NJ, NY, OH, PA, RI, SD, UT, VT, WI and WV.
SC334_QA2025-06-25. Service campaign. VOLUNTARY SERVICE CAMPAIGN: QUESTION AND ANSWER (SC334) - This document is the Question and Answer Guide containing the most frequently asked questions regarding the Voluntary Service Campaign SC334.
SC334_OWNR2025-06-25. Service campaign. VOLUNTARY SERVICE CAMPAIGN: OWNER NOTIFICATION (SC334) - This document is the owner notification advising that Kia is conducting a Voluntary Service Campaign to inspect and, if necessary, replace the brake line(s) in certain 2014-2019 MY Soul vehicles that were originally sold in or are currently registered in states where heavy amounts of road salt are used. In addition, an anti-corrosion material will be applied to the underbody components for added protection.
SC334_DPSM2025-06-25. Service campaign. VOLUNTARY SERVICE CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO (SC334) - This document is the announcement to the dealer Parts and Service managers advising that Kia is conducting a Voluntary Service Campaign to inspect and, if necessary, replace the brake line(s) in certain 2014-2019 MY Soul vehicles, manufactured from July 21, 2013 through December 24, 2018, that were originally sold in or are currently registered in states where heavy amounts of road salt are used. In addition, an anti-corrosion material will be applied to the underbody components for added protection.
SC334_DP2025-06-19. Service campaign. VOLUNTARY SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO (SC334) - This document is the announcement to the dealer principals advising that Kia is conducting a Voluntary Service Campaign to inspect and, if necessary, replace the brake line(s) in certain 2014-2019 MY Soul vehicles, manufactured from July 21, 2013 through December 24, 2018, that were originally sold in or are currently registered in states where heavy amounts of road salt are used. In addition, an anti-corrosion material will be applied to the underbody components for added protection.
SC321_TSB_R12024-09-30. Service campaign. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: IEB INSPECTION AND WATER PROOFING OR IEB REPLACEMENT (SC321) - 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 the procedure to inspect the Integrated Electronic Booster (IEB) on certain 2019-2022MY Niro EV (DE EV) vehicles produced from December 5, 2018 through April 12, 2022, that were originally sold or are currently registered in one of the 28 states where heavy amounts of road salt are used. Over time, saltwater inflow into the Integrated IEB at the IEB fastening bolt hole may cause corrosion and lead to an inoperable IEB motor. Should this occur, the vehicle may experience illumination of the Anti-lock Brake System (ABS), Forward Collision-Avoidance Assist (FCA) warning lights, and/or a firmer brake pedal feel. The brakes remain operational. Kia is conducting this service campaign to improve corrosion resistance of the IEB assembly.
SC321_TSB2024-09-25. Service bulletin. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: IEB INSPECTION AND WATER PROOFING OR IEB REPLACEMENT (SC321) - This bulletin provides the procedure to inspect the Integrated Electronic Booster (IEB) on certain 2019-2022MY Niro EV (DE EV) vehicles produced from December 5, 2018 through April 12, 2022, that were originally sold orare currently registered in one of the 28 states where heavy amounts of road salt are used. Over time, saltwater inflow into the Integrated IEB at the IEB fastening bolt hole may cause corrosion and lead to an inoperable IEB motor. Should this occur, the vehicle may experience illumination of the Anti-lock Brake System (ABS), Forward Collision-Avoidance Assist (FCA) warning lights, and/or a firmer brake pedal feel. The brakes remain operational. Kia is conducting this service campaign to improve corrosion resistance of the IEB assembly.