Kia K4 Service Bulletins
21 manufacturer communications on file.
- July 22, 2026•Document ID: 11035251Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE414_R1
- Date Added:
- July 28, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: BODY DOMAIN CONTROLLER (BDC) REPLACEMENT (CA2515 Revision 1) - 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 regarding the Body Domain Control unit ‘BDC’ on certain 2025MY and 2026MY K4 (CL4) vehicles manufactured from May 1, 2025, through February 9, 2026. Due to a communication issue between the key fob and the BDC, the affected vehicles may exhibit a NO START condition when the ignition 'START' button is pressed; however, all other key fob functions such as the Lock/Unlock, Trunk Release, Alarm, and Remote Start continue to operate normally.
Associated Products (2)Associated Documents - May 28, 2026•Document ID: 11033217Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE422
- Date Added:
- June 3, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: INFOTAINMENT SYSTEM SOFTWARE UPDATE USING UPDATE.KIA.COM - This bulletin provides information and service procedures for updating the infotainment systems on applicable Kia vehicles using the Kia Navigation Updater available at update.kia.com. The software update may improve system performance, enhance existing features, and apply the latest operating software for supported vehicles (2021-2026MY All Models).
Associated Products (70)Associated Documents - April 28, 2026•Document ID: 11031905Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE414
- Date Added:
- May 1, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: BODY DOMAIN CONTROLLER (BDC) REPLACEMENT (CA2515) - This bulletin provides information regarding the Body Domain Control unit (“BDC”) on certain 2025MY and 2026MY K4 (CL4) vehicles manufactured from May 1, 2025, through Feb 9, 2026. Due to a communication issue between the key fob and the BDC, the affected vehicles may exhibit a NO START condition when the ignition 'START' button is pressed; however, all other key fob functions such as the Lock/Unlock, Trunk Release, Alarm, and Remote Start continue to operate normally.
Associated Products (2)Associated Documents - April 14, 2026•Document ID: 11031906Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE417
- Date Added:
- May 1, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: INFOTAINMENT SOFTWARE UPDATE PROCEDURE - This bulletin provides information on the process for downloading infotainment software updates and preparing USB for installation on applicable Kia vehicles. The software downloads and USB preparation process is similar across all supported platforms; however, in‑vehicle installation procedures vary by head unit type.
Associated Products (45)Associated Documents - March 20, 2026•Document ID: 11030344Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE413
- Date Added:
- March 31, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: DCU COMMUNICATION LOGIC IMPROVEMENT - This bulletin provides the procedure to upgrade the Data Connectivity Unit (DCU) system software on some 2025–2026MY vehicles listed in the table below. Kia has identified that Connected Car Services (CCS) functionality may intermittently fail due to temporary DCU communication issues. This condition can impact convenience and connectivity features by causing the Remote Start and Remote Climate functions to become inoperative, prevent vehicle status updates in the Kia Access app, and interrupt connected navigation routing services.
Associated Products (10)Associated Documents - February 10, 2026•Document ID: 11028738Service CampaignENGINE
- Mfr Comm. #:
- TSB_ENG261_R1
- Date Added:
- February 11, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC26) - 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 related to extracting “in use monitoring performance tracking” emissions data from the Engine Control Unit (ECU) of certain vehicles sold in California. The California Air Resources Board (CARB) requires the emissions data from vehicles with a minimum of 3,000 accumulated miles without reprogramming or resetting.
Associated Products (6)Associated Documents - January 28, 2026•Document ID: 11027858Service Bulletin/Repair InstructionsENGINE
- Mfr Comm. #:
- TSB_ENG261
- Date Added:
- January 28, 2026
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC26) - This bulletin provides information related to extracting “in use monitoring performance tracking” emissions data from the Engine Control Unit (ECU) of certain vehicles sold in California. The California Air Resources Board (CARB) requires the emissions data from vehicles with a minimum of 3,000 accumulated miles without reprogramming or resetting.
Associated Products (7)Associated Documents - December 9, 2025•Document ID: 11026698OtherBACK OVER PREVENTION: WARNINGS
- Mfr Comm. #:
- PS797
- Date Added:
- December 18, 2025
- Manufacturer:
- KIA
SummaryPITSTOP: TECHNICAL OPERATIONS: EXTERNAL DAMAGE TO ULTRASONIC SENSOR: This Pitstop provides information related to Parking Distance Warning (PDW) alerts and repairs involving ultrasonic sensors. The PDW system alerts the driver while parking, by calculating distance based on the difference in signal transmission and reception times between the vehicle (ultrasonic sensor) and an object. The membrane film of the ultrasonic sensor is used for object detention and can be damaged by stone chips or foreign substances while driving. Damage to the cover of the ultrasonic sensor can also lead to damage to the internal circuit. As a result of this external damage, the PDW system may not receive the proper signal from the ultrasonic sensor. In some cases, the system may cause a false alarm, no alert, or phantom warnings by a “Warning Lamp’ to be displayed on the cluster. The ultrasonic sensor membrane film should be always inspected for external damage and if any part replacement should be treated as a general repair, not as a warranty claim repair for this concern. (Please note that this Pitstop only applies to models/trims that are equipped with the ultrasonic sensors.)
Associated Products (157)Associated Documents - December 2, 2025•Document ID: 11026532Over The AirENGINE; ELECTRICAL SYSTEM
- Mfr Comm. #:
- OTA_SA621
- Date Added:
- December 10, 2025
- Manufacturer:
- KIA
SummaryRELEASE NOTES: OVER-THE-AIR: SERVICE ACTION SOFTWARE UPDATE FOR WARNING LIGHTS (SA621) - This Over-the-Air (OTA) software update is designed to update the Engine Control Unit (ECU) logic of certain 2025 K4 vehicles. This update improves the processing logic of the Engine Control Unit (ECU) to reduce the unintended display of warning lights.
Associated Products (1)Associated Documents - September 13, 2025•Document ID: 11023283Service Bulletin/Repair InstructionsENGINE
- Mfr Comm. #:
- TSB_ENG258
- Date Added:
- September 23, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: SERVICE ACTION: ECM JUDGEMENT LOGIC IMPROVEMENT FOR DTC P218100 (SA621) - This bulletin provides information to upgrade the Engine Control Module (ECM) system software on certain 2025MY K4 (CL4m) vehicles produced from July 03, 2024 through April 28, 2025 equipped with an Nu 2.0L MPI engine. The vehicles affected may exhibit a MIL ‘ON’ with DTC P218100 stored under certain driving conditions such as high-load, high-speed driving in low temperature environments. There are no drivability or other symptoms associated with this condition. High-load control logic helps to lower the coolant temperature by allowing the valve of the Integrated Thermal Module (ITM) to fully open the radiator port during rapid acceleration.
Associated Products (1)Associated Documents - September 12, 2025•Document ID: 11023288OtherELECTRICAL SYSTEM
- Mfr Comm. #:
- OTA_SA620
- Date Added:
- September 23, 2025
- Manufacturer:
- KIA
SummaryRELEASE NOTES: OVER-THE-AIR: SERVICE ACTION: SOFTWARE UPDATE FOR RCM (SA620) - This Over-the-Air (OTA) software update is designed to update the Roof Control Module (RCM) of certain 2025 K4 vehicles. This update is designed to improve software logic for a smoother sunroof response during one-touch actuation.
Associated Products (1)Associated Documents - August 22, 2025•Document ID: 11022347OtherELECTRICAL SYSTEM
- Mfr Comm. #:
- PS791
- Date Added:
- September 2, 2025
- Manufacturer:
- KIA
SummaryPITSTOP: TECHNICAL OPERATIONS: DCU IDENTIFICATION AND DAIGNOSTIC AID - This Pitstop provides information on identifying the Data Connectivity Unit (DCU) in Kia vehicles equipped with Connected Car Navigation Cockpit (ccNC) and ccNC Lite head units, as well as a diagnostic aid when diagnosing Kia Connect concerns. When diagnosing non-operational Kia Connect concerns, under no circumstance should the DCU be swapped with a known good DCU from another vehicle. Doing so may result in inoperative Kia Connect services on either vehicle and may require the replacement of the known good DCU. If a DCU needs to be replaced, the recommendation is to always order a replacement unit (with the correct P/N) to ensure proper Kia Connect services operations using the newly installed/replaced DCU.
Associated Products (7)Associated Documents - August 7, 2025•Document ID: 11021859Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE385
- Date Added:
- August 13, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: BODY DOMAIN CONTROLLER (BDC) REPLACEMENT (CA2507) - This bulletin provides information regarding the Body Domain Control unit (BDC) on certain 2025MY K4 (CL4) vehicles manufactured from June 1, 2024 through May 1, 2025. Due to a communication issue between the key fob and the BDC, the affected vehicles may exhibit a NO START condition when the ignition 'START' button is pressed accompanied by the inability to move the shifter out of the Park (P) position; however, all other Key Fob functions such as the Lock/Unlock, Trunk Release, Alarm and Remote Start continue to operate normally.
Associated Products (1)Associated Documents - June 27, 2025•Document ID: 11019907Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE390
- Date Added:
- July 1, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: SERVICE ACTION: SUNROOF OPERATION LOGIC IMPROVEMENT (SA620) - This bulletin supersedes TSB SA595 (December 2024) and outlines the procedure to update the Roof Control Module (RCM) software on certain 2025MY K4 (CL4) vehicles produced between September 19, 2024, through May 28, 2025, which may experience inoperative sunroof operation (open/close) due to a software logic error. The updated software includes improved logic to address this issue.
Associated Products (1)Associated Documents - June 26, 2025•Document ID: 11020011Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE363_CLSD
- Date Added:
- July 1, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: SERVICE ACTION: SUNROOF OPERATION SOFTWARE LOGIC IMPROVEMENT (SA595) - CLOSED AND SUPERSEDED BY ELE390/SA620 - This bulletin provided the procedure to update the Roof Control Module (RCM) software on certain 2025MY K4 (CL4) vehicles produced from September 17, 2024 to November 01, 2024 which may exhibit an inoperable (open/close) sunroof operation due to a software logic error. This logic improvement includes a factory mode activation/deactivation to reset the RCM module for sunroof initialization.
Associated Products (1)Associated Documents - June 5, 2025•Document ID: 11019480Service Bulletin/Repair InstructionsEXTERIOR LIGHTING
- Mfr Comm. #:
- TSB_ELE384
- Date Added:
- June 11, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: REAR COMBINATION LAMP BULB REPLACEMENT (CA2506) - This bulletin provides information regarding the replacement of the rear turn signal bulbs and stop lamp bulbs in the rear combination lamps on certain 2025MY K4 (CL4m) vehicles produced from July 5, 2024, to February 15, 2025, and equipped with incandescent bulbs. The bulbs might prematurely become inoperative.
Associated Products (1)Associated Documents - April 17, 2025•Document ID: 11017172Service Bulletin/Repair InstructionsPOWER TRAIN
- Mfr Comm. #:
- TSB_TRA046_R5
- Date Added:
- April 23, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL 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.
Associated Products (165)Associated Documents - March 6, 2025•Document ID: 11015426Service Bulletin/Repair InstructionsELECTRICAL SYSTEM
- Mfr Comm. #:
- TSB_ELE341_R4
- Date Added:
- March 8, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: COMBINATION TSB/SERVICE ACTION: CCNC – DEALER MODE, FACTORY & NETWORK RESET (SA613) - This bulletin has been revised as a Combination TSB/SA and includes additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to access the ‘Dealer Mode’ function on 2024MY~ models listed on page 5 equipped with a Connected Car Navigation Cockpit (ccNC) head unit, and to perform a ‘Reset Network’ and/or ‘Factory Reset’ to address customer concerns related to activation of Kia Connect or Kia Connect features that may have stopped working.
Associated Products (6)Associated Documents - February 26, 2025•Document ID: 11014570Service Bulletin/Repair InstructionsVISIBILITY/WIPER
- Mfr Comm. #:
- TSB_BOD338_R1
- Date Added:
- February 27, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: SERVICE ACTION: WINDSHIELD WASHER FLUID REPLACEMENT (SA606) - 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 replace the windshield wiper fluid on certain 2025MY K4 (CL4) vehicles produced from January 20, 2025 to January 21, 2025, which may have been contaminated/mixed with engine coolant fluid during assembly. The coolant fluid may form an ‘oily/sticky’ mixture preventing proper cleaning of the vehicle’s windshield when the windshield wiper is activated.
Associated Products (1)Associated Documents - February 20, 2025•Document ID: 11014374Service Bulletin/Repair InstructionsVISIBILITY/WIPER
- Mfr Comm. #:
- TSB_BOD338
- Date Added:
- February 20, 2025
- Manufacturer:
- KIA
SummaryTECHNICAL SERVICE BULLETIN: SERVICE ACTION: WINDSHIELD WASHER FLUID REPLACEMENT (SA606) - This bulletin provides the procedure to replace the windshield wiper fluid on certain 2025MY K4 (CL4) vehicles produced from January 20, 2025 to January 21, 2025, which may have been contaminated/mixed with engine coolant fluid during assembly. The coolant fluid may form an ‘oily/sticky’ mixture preventing proper cleaning of the vehicle’s windshield when the windshield wiper is activated.
Associated Products (1)Associated Documents