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Service bulletins for the 2015 Kia Optima

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.

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

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Bulletins, newest first
TSB_CHA091_R22020-05-05. Service bulletin. STEERING. TECHNICAL SERVICE BULLETIN: STEERING GEAR YOKE PLUG AND ASSEMBLY REPLACEMENT - This bulletin has been revised to include additional information. This bulletin provides the procedure to replace the steering gear box yoke plug and assembly on some models listed below, which may exhibit a ticking noise while turning the steering wheel with the vehicle stopped. This condition is caused by a worn lining on the steering gear box yoke assembly.
TSB_TRA046_R12020-05-05. Service bulletin. POWER TRAIN. TECHNICAL SERVICE BULLETIN: - TRANSMISSION FLUID APPLICATION GUIDE - This bulletin has been revised to include additional information. 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 on page 2. Refer to the shop manual on KGIS for the specific Kia model for the correct transmission fluid check/fill procedures.
TSB_ENG205_C2020-05-05. Service bulletin. ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: WIRING SIGNAL INTERFERENCE CHECK & ENGINE NOISE INSPECTION (SA379) - CLOSED - SUPERSEDED BY PI1802YZ/1803YZ.
PI1802YZ_TSB_R12020-05-05. Service bulletin. ENGINE AND ENGINE COOLING. PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional information. This bulletin provides information related to the Technical Service Bulletin previously published in July 2018 (PI1802 Rev 10, 03/16/2020) titled "Knock Sensor Detection System - ECU Logic Improvement". Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below return to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).
PI1802WX_TSB_R7C2020-05-05. Service bulletin. ENGINE AND ENGINE COOLING. PRODUCT IMPROVEMENT CAMPAIGN: TSB_R7 - ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802W/X) - CLOSED - SUPERSEDED BY PI1802Y/Z.
PI1802YZ_TSB2020-04-07. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: TSB - ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional information. This bulletin provides information related to the Technical Service Bulletin previously published in July 2018 (PI1802 Rev 10, 03/16/2020) titled Knock Sensor Detection System - ECU Logic Improvement. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below return to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).
PI1802_TSB_R102020-04-07. Service bulletin. ENGINE AND ENGINE COOLING. PRODUCT IMPROVEMENT CAMPAIGN: TSB - REV 10 - KNOCK SENSOR DETECTION SYSTEM - ECU LOGIC IMPROVEMENT (PI1802) - This bulletin has been revised to include additional information. This bulletin provides information related to a software update to the Engine Control Unit (ECU) to install the Knock Sensor Detection System (KSDS) in order to protect the engine from excessive connecting rod bearing damage.
TSB_CHA098_R22020-04-07. Service bulletin. SERVICE BRAKES, HYDRAULIC. TECHNICAL SERVICE BULLETIN: 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.
PI1802_TSB_R92020-03-05. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TSB - PRODUCT IMPROVEMENT CAMPAIGN - KNOCK SENSOR DETECTION SYSTEM - ECU LOGIC IMPROVEMENT (PI1802) Rev.9 - This bulletin provides information related to a software update to the Engine Control Unit (ECU) to install the Knock Sensor Detection System (KSDS) in order to protect the engine from excessive connecting rod bearing damage.
TSB_ELE1482020-02-04. Service bulletin. EXTERIOR LIGHTING. TECHNICAL SERVICE BULLETIN: HALOGEN HEAD LAMP LOW BEAM BULB CONNECTOR REPLACEMENT - This bulletin provides information regarding the procedure to repair the bulb connector on some 2010MY~ vehicles listed on the table below, which may exhibit a bulb connector concern. To correct this concern, replace the connector with a new and improved part.
TSB_CHA091_R12020-02-04. Service bulletin. STEERING. TECHNICAL SERVICE BULLETIN: STEERING GEAR YOKE PLUG AND ASSEMBLY REPLACEMENT - This bulletin has been revised to include additional information. This bulletin provides the procedure to replace the steering gear box yoke plug and assembly on some models listed below, which may exhibit a ticking noise while turning the steering wheel with the vehicle stopped. This condition is caused by a worn lining on the steering gear box yoke assembly. Follow the procedure outlined in this bulletin to replace the steering gear box yoke plug and assembly with updated parts.
PI1802WX_TSB_R72020-02-03. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:WIRING. PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802W/X) - This bulletin has been revised to include additional information.This bulletin provides information related to the Technical Service Bulletin previously published in July 2018 (PI1802, Rev 6, 01/31/2019) titled "Knock Sensor Detection System - ECU Logic Improvement". Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below returns to the dealer with Diagnostic Trouble Code (DTC), P1326.
PI1802_OWN#3_OPT2020-01-04. Service bulletin. ENGINE AND ENGINE COOLING. Owner Letter - PRODUCT IMPROVEMENT CAMPAIGN (PI1802) **THIRD NOTICE** - Dear Kia Optima Owner: Kia Motors America, Inc. is conducting an important Product Improvement Campaign to perform a software update on some 2014 MY Optima vehicles equipped with 2.4L Gasoline Direct Injection ("GDI") engines, and all 2015-2018 MY Optima vehicles equipped with 2.4L GDI and 2.0L Turbocharged GDI ("T-GDI") engines to protect the engine from excessive connecting rod bearing damage. The update will be done free of charge and will only involve the addition of newly developed computer software for the Engine Control Unit ("ECU").
PI1802WX_TSB_R62019-12-09. Service bulletin. ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN PI1802W/X (Rev 6) - PRODUCT IMPROVEMENT CAMPAIGN - ENGINE REPLACEMENT INSTRUCTIONS - This bulletin has been revised to include additional information. This bulletin provides information related to the Technical Service Bulletin previously published in July 2018 (PI1802, Rev 6, 01/31/2019) titled '"Knock Sensor Detection System - ECU Logic Improvement". Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below returns to the dealer with Diagnostic Trouble Code ("DTC"), P1326.
TSBCHA084_R42019-12-09. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING; STEERING. TECHNICAL SERVICE BULLETIN: PARTIAL REPAIR OF C-MDPS MOTOR, ECU AND/OR STEERING COLUMN HOUSING - This bulletin has been revised to include additional information.This bulletin provides information regarding the partial repair of the Motor Driven Power Steering (MDPS) Motor, Electronic Control Unit (ECU) or Steering Column Housing on some 2010MY~ Kia models listed on page 5 equipped with a Column Motor Driven Power Steering (C-MDPS) unit. Follow the MDPS Flowchart (page 2) along with the MDPS DTC Table (page 3) procedure outlined in this bulletin before replacing the C-MDPS Motor, ECU or Steering Column Housing.
PI1802_TSB_R82019-12-09. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING. TSB - Product Improvement Campaign: KNOCK SENSOR DETECTION SYSTEM - ECU LOGIC IMPROVEMENT (PI1802) - This bulletin has been revised to include additional information. This bulletin provides information related to a software update to the Engine Control Unit (ECU) to install the Knock Sensor Detection System (KSDS) in order to protect the engine from excessive connecting rod bearing damage.
TSBCHA084_R32019-11-07. Service bulletin. STEERING. TECHNICAL SERVICE BULLETIN TSB084_R3: PARTIAL REPAIR OF C-MDPS MOTOR, ECU AND/OR STEERING COLUMN HOUSING - This bulletin has been revised to include additional information.This bulletin provides information regarding the partial repair of the Motor Driven Power Steering (MDPS) Motor, Electronic Control Unit (ECU) or Steering Column Housing on some 2010MY~ Kia models listed on page 5 equipped with a Column Motor Driven Power Steering (C-MDPS) unit.
PS6162019-11-07. Service bulletin. ENGINE AND ENGINE COOLING. PITSTOP: LOWER ENGINE SERVICE COVER BOLT LOCATIONS - This Pitstop provides information on the correct bolt location of the lower engine service cover on 2016-2020MY Optima 2.4L and 2.0L equipped vehicles. The lower engine service cover is secured by seven (7) retaining bolts. Installation of the two (2) long bolts in the incorrect location may cause puncture or damage to the oil pan in the event that the vehicle is bottomed out while driving. If the oil pan is damaged or punctured, the engine oil may leak, possibly causing engine damage. This
PI1802_TSB_R72019-10-03. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN - KNOCK SENSOR DETECTION SYSTEM - ECU LOGIC IMPROVEMENT (PI1802) - This bulletin provides information related to a software update to the Engine Control Unit (ECU) to install the Knock Sensor Detection System (KSDS) in order to protect the engine from excessive connecting rod bearing damage. The KSDS detects vibrations indicating the onset of excessive connecting rod bearing wear. It is designed to alert the driver at an early stage of bearing wear before the occurrence of severe engine damage, including engine failure. If vibrations caused by bearing wear start to occur, the Malfunction Indicator Lamp (MIL) will blink continuously, and the vehicle will be placed in Limp Home Mode. This will reduce further damage to the engine and ensure that the vehicle occupants are not exposed to the risk of a more severe engine failure. At that time, Diagnostic Trouble Code (“DTC”) P1326, specific to the KSDS, will be recorded in the ECU. The vehicle can continue to be operated for a limited time in Limp Home Mode, but it will accelerate slowly and have a reduced maximum speed. Also, engine RPMs will be limited to approximately 1800-2000 RPM.
TSBCHA0982019-09-06. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL. TSBCHA098: IBAU SYSTEM REPAIR GUIDE FOR NOISE AND AIR BLEEDING - This bulletin provides the repair guide for the Integrated Brake Actuation Unit (iBAU) system on some 2014-2019MY Kia 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.
TSBCHA098_R12019-09-06. Service bulletin. SERVICE BRAKES, HYDRAULIC. 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.
PI1802_OWNR2_OPT2019-07-04. Service bulletin. ENGINE AND ENGINE COOLING. PI1802_OWNR2_OPT: Kia Motors America, Inc. is conducting an important Product Improvement Campaign to perform a software update on some 2014 MY Optima vehicles equipped with 2.4L Gasoline Direct Injection ("GDI") engines, and all 2015-2018 MY Optima vehicles equipped with 2.4L GDI and 2.0L Turbocharged GDI ("T-GDI") engines to protect the engine from excessive connecting rod bearing damage. The update will be done free of charge and will only involve the addition of newly developed computer software for the Engine Control Unit ("ECU").
TSBCHA084_R22019-07-04. Service bulletin. STEERING; STEERING:COLUMN. TSB: REPLACEMENT OF C-MDPS MOTOR, ECU AND/OR STEERING COLUMN HOUSING - This bulletin has been revised to include additional information. This bulletin provides information regarding the partial repair of the Motor Driven Power Steering (MDPS) Motor, Electronic Control Unit (ECU) or Steering Column Housing on the Kia models listed on the chart below with a column mounted C-MDPS unit.
TSBENG205_R12019-04-30. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TSB: SERVICE ACTION: WIRING SIGNAL INTERFERENCE CHECK & ENGINE NOISE INSPECTION (SA379) - This bulletin provides information related to an expanded diagnostic test that is now required on a number of vehicles previously diagnosed with Diagnostic Trouble Code ("DTC") P1326. Using the procedures published in TSB PI1802W/X and PI1803W/X, the subject vehicles were diagnosed and determined to require an engine replacement and are currently being held at dealers pending repair. As a result of additional field data collection and analysis, the initial diagnosis method has been updated to improve test result accuracy. Prior to performing an engine replacement on any of the VINs affected by this Service Action, the engine condition needs to be re-assessed utilizing an updated/expanded diagnostic process.
TSBENG2052019-04-30. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TSB: SERVICE ACTION: WIRING SIGNAL INTERFERENCE CHECK & ENGINE NOISE INSPECTION (SA379) - This bulletin provides information related to an expanded diagnostic test that is now required on a number of vehicles previously diagnosed with Diagnostic Trouble Code ("DTC") P1326. Using the procedures published in TSB PI1802W/X and PI1803W/X, the subject vehicles were diagnosed and determined to require an engine replacement and are currently being held at dealers pending repair. As a result of additional field data collection and analysis, the initial diagnosis method has been updated to improve test result accuracy. Prior to performing an engine replacement on any of the VINs affected by this Service Action, the engine condition needs to be re-assessed utilizing an updated/expanded diagnostic process.

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