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Service bulletins for the 2021 Kia Sorento

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.

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

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
TSB_ENG2572025-12-10. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: ITM REPLACEMENT AND ECM & TCM LOGIC IMPROVEMENT (CA2508) - This bulletin provides information to replace the Integrated Thermal Management Module (ITM) and then upgrade the Engine Control Module ‘ECM’ and (if applicable) the Transmission Control Module ‘TCM’ system software on certain 2021-2023MY Sorento (MQ4a) vehicles produced from September 09, 2020 through December 19, 2023. The affected vehicles may experience an illuminated Multifunction Indicator Lamp (MIL) ‘ON’ with DTC(s) P218100, P2181F0, and/or P2181F1 stored. This condition may occur due to degradation of the diaphragm inside the ITM. There are no drivability or other symptoms associated with this condition.
TSB_ELE271_R32025-07-23. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INVERTER COOLANT/DEBRIS FLUSHING /REPLACEMENT FOR CLUSTER MESSAGE “REFILL INVERTER COOLANT” (SA515) - 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 flush out the inverter low-conductivity coolant (BSC-1) on certain 2021-2022MY Sorento HEV (MQ4 HEV) vehicles produced from September 2, 2020 through September 29, 2021 and Sorento PHEV (MQ4 PHEV) vehicles produced from June 29, 2021 through October 1, 2021, which may exhibit a “Refill inverter coolant” message displayed on the instrument cluster due to poor flow of coolant/antifreeze inside the low-conductivity coolant pipe. In most cases, the inverter reservoir tank coolant may be filled to normal level and no diagnostic trouble codes (DTC)s are stored due to an increase operation of the electric water pump (EWP) that is 2,800 RPMs or more when checked.
TSB_ ENG2562025-07-09. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: CONTINUOUS VARIABLE VALVE DURATION (CVVD) ACTUATOR OIL SEAL REPLACEMENT - This bulletin provides information to replace the Continuous Variable Valve Duration (CVVD) Actuator seal on some 2021-2022MY Sorento P/HEV (MQ4 P/HEV) vehicles produced from September 02, 2020, through February 24, 2022. The affected vehicles may experience a slow oil leak coming from the CVVD actuator oil seal and potentially associated oil smell due to the oil seal material degrading over time.
TSB_ENG222_R82025-04-18. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the table on pages 9 and 10 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
TSB_ENG222_R72025-03-04. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2024MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
TSB_ELE271_R22023-11-03. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR CLUSTER MESSAGE "REFILL INVERTER COOLANT" (SA515) - 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 flush out the inverter low-conductivity coolant (BSC-1) on certain 2021-2022MY Sorento HEV (MQ4 HEV) vehicles produced from September 2, 2020 through September 29, 2021 and Sorento PHEV (MQ4 PHEV) vehicles produced from June 29, 2021 through October 1, 2021, which may exhibit a "Refill inverter coolant" message displayed on the instrument cluster due to poor flow of coolant/antifreeze inside the low-conductivity coolant pipe. In most cases, the inverter reservoir tank coolant may be filled to normal level and no diagnostic trouble codes (DTC)s are stored due to an increase operation of the electric water pump (EWP) that is 2,800 RPMs or more when checked.
TSB_ELE271_R12023-05-04. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR CLUSTER MESSAGE "REFILL INVERTER COOLANT" (SA515): 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 flush out the inverter low-conductivity coolant (BSC-1) on certain 2021-2022MY Sorento HEV (MQ4 HEV) vehicles produced from September 2, 2020 through September 29, 2021 and Sorento PHEV (MQ4 PHEV) vehicles produced from June 29, 2021 through October 1, 2021, which may exhibit a "Refill inverter coolant" message displayed on the instrument cluster due to poor flow of coolant/antifreeze inside the low-conductivity coolant pipe. In most cases, the inverter reservoir tank coolant may be filled to normal level and no diagnostic trouble codes (DTC)s are stored due to an increase operation of the electric water pump (EWP) that is 2,800 RPMs or more when checked.
TSB_ELE2822023-04-22. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: MQ4 HEV LEAFLET AND RESERVOIR CAP LABEL REPLACEMENT(SA524) - This bulletin provides information to replace the hybrid motor coolant reservoir cap label and provide a leaflet on some 2021-2022MY Sorento HEV (MQ4 HEV) vehicles produced from September 17, 2021 through January 10, 2022. Follow the procedure outlined in this publication to provide a leaflet in the glovebox and replace the hybrid motor coolant reservoir cap label.
TSB_ELE2812023-04-22. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: MQ4 HEV RESERVOIR CAP LABEL REPLACEMENT (SA523) - This bulletin provides information to replace the hybrid motor coolant reservoir cap label on some 2021MY - 2022MY Sorento (MQ4 HEV) vehicles produced from January 11, 2022 through May 19, 2022.
TSB_ELE2712023-04-22. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: INVERTER COOLANT/DEBRIS FLUSHING/REPLACEMENT FOR CLUSTER MESSAGE "REFILL INVERTER COOLANT" (SA515) - This bulletin provides information to flush out the inverter low-conductivity coolant on certain 2021-2022MY Sorento HEV (MQ4 HEV) vehicles produced from September 2, 2020 through September 29, 2021 and Sorento PHEV (MQ4a PHEV) vehicles produced from June 29, 2021 through October 1, 2021, which may exhibit a "Refill inverter coolant" message displayed on the instrument cluster due to poor flow of coolant/antifreeze inside the low-conductivity coolant pipe. In most cases, the inverter reservoir tank coolant may be filled to normal level and no diagnostic trouble codes (DTC)s are stored due to an increase operation of the electric water pump (EWP) that is 2,800 RPMs or more when checked.
TSB_ELE2852023-04-06. Service bulletin. ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: MQ4 P/HEV GAMMA 1.6L T-GDI ECM & HCULDC LOGIC IMPROVEMENT FOR OIL DILUTION: This bulletin provides the procedure to update the software logic of the 'Engine' and Hybrid Control Unit Low DC-DC Converter 'HCULDC' systems on certain 2021-2023MY Sorento HEV, PHEV (MQ4 P/HEV) w/ Gamma 1.6L T-GDI vehicles produced from July 1, 2021 through November 3, 2022. The affected vehicles may exhibit a MIL 'ON' with DTCs stored (P144100, P1A7795, P00B700, P211800, P040100, P023600, P029900, P2B6000) due to the engine oil becoming diluted with fuel and/or moisture caused by repeated short drive trips, in low outdoor temperature (32 degree F-) environments.
PS719_R12022-09-30. Service bulletin. ENGINE AND ENGINE COOLING. PITSTOP: POTENTIAL LOW OIL PRESSURE DUE TO FILTER DRAIN PLUG THAT WAS LEFT IN FILTER - 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. Attention Dealership Service Managers, Service and Lube Techs, pay particular attention to this information. This Pitstop provides information regarding potential engine damage if the proper procedures are not followed during an oil change on the vehicles listed above equipped with 2.5L/2.5L-T GDI Theta III engines. Prior to installing: The oil filter service kit should be inspected for missing parts, if any of the parts are missing from the oil filter kit, inspect the oil filter carefully as parts can be dislodged during shipping.
TSB_ENG219_R12022-09-30. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: MAINTENANCE REMINDER FEATURE - 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 on setting the "Service Interval Reminder" feature available on most 2014-2023MY Kia vehicles (refer to model list on page 2). If the service interval reminder is set, the customer will be informed to have the next maintenance service performed, which can positively affect vehicle longevity and performance. Refer to TSB ENG241 for 2023MY~ vehicles equipped with the Oil Life Management System (OLMS) feature not included in table on page 2.
TSB_ENG222_R62022-03-31. Service bulletin. ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2021MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
TSB_ENG2352022-02-04. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV). TECHNICAL SERVICE BULLETIN: AIR INTAKE SYSTEM CLEANING, PCV VALVE & AIR FILTER REPLACEMENT DUE TO OIL CONTAMINATION - This bulletin provides information regarding the air intake system which may become contaminated with oil due to a faulty Positive Crankcase Ventilation (PCV) check valve on some 2021-2022MY Sorento (MQ4a) vehicles equipped with Theta III 2.5L T-GDI engine, produced from September 10, 2020 through October 2, 2021, which may allow engine oil to enter the air intake system and contaminate the engine air filter with oil.
TSB_ENG222_R52022-01-20. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2021MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
PS7192022-01-04. Service bulletin. ENGINE AND ENGINE COOLING. PITSTOP: POTENTIAL LOW OIL PRESSURE DUE TO FILTER DRAIN PLUG THAT WAS LEFT IN FILTER - Attention Dealership Service Managers, Service and Lube Techs, pay particular attention to this information. This Pitstop provides information regarding potential engine damage if the proper procedures are not followed during an oil change on some 2021 and later K5 (DL3a) and Sorento (MQ4a) vehicles equipped with 2.5L/2.5L-T GDI Theta III engines.
TSB_FUE054_CLSD2021-12-23. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. TSB_FUE054_CLOSED: TECHNICAL SERVICE BULLETIN CLOSED
TSB_FUE0542021-12-23. Service bulletin. FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: 2.5L GDI WITH MIL ON DTC P2074XX ECM LOGIC IMPROVEMENT (SA489) - This bulletin provides the procedure to update the software logic of the Engine Control Module (ECM) system on some 2021-2022MY Sorento (MQ4a) vehicles with Theta 2.5L GDI engines, produced from September 30, 2020 through October 25, 2021, which may exhibit an MIL ON with DTC P2074XX due to throttle position to Mass Air Flow Sensor (MAF) correlation value reading error under high load.
TSB_ENG222_R42021-12-23. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2021MY vehicles (refer to the tables on pages 8-9 for applicable models and engine), which may exhibit a symptom of excessive oil consumption.
TSB_FUE0552021-12-23. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: 2.5L GDI WITH MIL ON DTC P2074XX ECM LOGIC IMPROVEMENT (SA489A) - This bulletin provides the procedure to update the software logic of the Engine Control Module (ECM) system on some 2021-2022MY Sorento (MQ4a) vehicles with Theta 2.5L GDI engines, produced from September 30, 2020 through October 25, 2021, which may exhibit an MIL 'ON' with DTC P2074XX due to throttle position to Mass Air Flow Sensor (MAF) correlation value reading error under high load.
TSB_ENG222_R32021-09-10. Service bulletin. ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: EXCESSIVE OIL CONSUMPTION NU/GAMMA/THETA/KAPPA ENGINES - 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 on diagnosing and/or repairing some 2011-2019MY vehicles (refer to table below for applicable model and engine), which may exhibit a symptom of excessive oil consumption.
PS6862021-03-04. Service bulletin. ENGINE AND ENGINE COOLING. PITSTOP/TECHNICAL OPERATIONS - SMOKE MACHINE NOT TO BE USED FOR EMISSIONS TESTING WITH HEV/PHEV MODELS - This Pitstop provides information to properly test the evaporative emissions system in all Kia 2011MY~ Hybrid (HEV) and Plug-In Hybrid (PHEV) model vehicles. A smoke machine should NEVER be used when testing the evaporative system in a HEV/PHEV model vehicle.
TSB_ENG216_R22021-03-04. Service bulletin. ENGINE AND ENGINE COOLING. TECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC21) - 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 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.
TSB_ENG2252021-02-02. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. TECHNICAL SERVICE BULLETIN: SERVICE ACTION: CENTER AND REAR MUFFLER INSPECTION AND REPAIR (SA461) - This bulletin provides the procedure to inspect the center muffler on some 2021MY Sorento (MQ4a HEV) vehicles equipped with 1.6L T-GDI engine, produced from September 02, 2020 through December 30, 2020, which may exhibit a poor engine start up due to freezing of condensation in the muffler(s) after parking the vehicle for an extended period of time in cold/freezing temperature. The issue does not affect drivability once the vehicle is started.

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