2021 Hyundai Sonata TSBs

Engine Control Module, resulting in an illuminated Check Engine warning lamp. Follow the procedure in this TSB to replace the Integrated Thermal Management (ITM) module and update both the Engine Control Module (ECM) and Transmission Control Module (TCM) if applicable. Follow the flowchart in this TSB to update the appropriate modules.

fuel injectors leaking internally. This may be caused by internal filter breakage in the injector. Follow the procedure in this TSB to replace all 4 injectors on affected vehicles, using the kit in the Parts Information section.

combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes or during normal driving operation.

This bulletin provides instructions to replace the multi-fuse, reroute the damaged wiring using the blower wiring kit, and replace the fuse label.

This bulletin provides instructions to replace the multi-fuse, reroute the damaged wiring using the blower wiring kit, and replace the fuse label.

This may be caused by internal filter breakage in the injector. Follow the procedure in this TSB to replace all 4 injectors on affected vehicles, using the kit in the Parts Information section.

Follow this bulletin to inspect the check valve, fuel pump cover and fuel tank, and update the ECU. If necessary, replace the check valve and/or fuel tank based on inspection results. The ECU Upgrade contains a revised DTC P14EE00 which supersedes P0451.

Lamp to come on.

Follow this bulletin to inspect the check valve, fuel pump cover and fuel tank, and update the ECU. If necessary, replace the check valve and/or fuel tank based on inspection results.

(TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.

or symptoms listed below, refer to the Service Procedure to diagnose the condition. DIAGNOSTIC TROUBLE CODES: P070500 - Transmission range sensor circuit malfunction P070512 - Transmission range sensor circuit malfunction P070514 - Transmission range sensor circuit malfunction P07051C - Transmission range sensor circuit malfunction P070600 - Transmission range sensor circuit range/performance P070661 - Transmission range sensor circuit range/performance P070696 - Transmission range sensor circuit range/performance SYMPTOMS: Malfunction Indicator Light (MIL) illuminated 5th gear fail-safe Intermittently wont shift into D or R Intermittently wont shift out of Park Intermittent ly no engine cr ank/n o start in P or N with or without MIL or DTC.

transmissions (8WDCT) and associated transmission control unit (TCU). These changes only apply to vehicles equipped with Theta 2.5T engines. Certain transmissions (indicated by a new part number) have received an improved clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise drivability concerns may occur.

service procedure and replace the related solenoid and harness.

and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles.

Service Procedure to diagnose the condition. DIAGNOSTIC TROUBLE CODES: P070500 - Transmission range sensor circuit malfunction P070512 - Transmission range sensor circuit malfunction P070514 - Transmission range sensor circuit malfunction P07051C - Transmission range sensor circuit malfunction P070600 - Transmission range sensor circuit range/performance P070661 - Transmission range sensor circuit range/performance P070696 - Transmission range sensor circuit range/performance SYMPTOMS: Malfunction Indicator Light (MIL) illuminated 5th gear fail-safe Intermittently wont shift into D or R Intermittently wont shift out of P Intermittent ly no engine crank in P or

certain 22MY Santa Cruz, and certain 21-23MY Tucson equipped with 2.5L GDI engines with one or more misfire DTC(s) due to internally leaking GDI injector(s)

transmission (8WDCT) replacement is necessary related due to high pressure electric oil pump (HP EOP) DTCs P1C2D03 (HP EOP Motor Position Sensor), P193B79 - HP EOP Performance, P0868 - Transmission Fluid Pressure (TFP) Sensor Low. Replace the 8WDCT under this bulletin.

engine) with one or more DTC.

engine) with one or more DTC.

service procedure and replace the related solenoid and harness.

certain 22MY Santa Cruz, and certain MY21-23 Tucson equipped with 2.5L GDI engines with one or more misfire DTC(s) due to internally leaking GDI injector(s).

combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes or during normal driving operation.

22MY Santa Cruz, and Tucson equipped with 2.5L GDI engines with one or more misfire DTC(s) due to internally leaking GDI injector(s).

load carrying capacity information indicated on tire placards when vehicle weight has been increased before retail sale. This limit is the lesser of 1.5% of GVWR or 100 pounds. If the total added weight exceeds the lesser of the limit, a label must be added to the driver-side B-pillar within 25mm (1 inch) of the original tire placard.

system accordingly during engine short block or sub-assembly replacement.

follow the repair procedure and perform the diagnosis. If necessary, replace the High Flow electric oil pump (HF EOP) for HF EOP issues or the Dual Clutch Transmission for High Pressure electric oil pump (HP EOP) issues.

If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.

If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.

the repair procedure and replace the related solenoid and valve body harness.

DTC(s): P2074: Mass Airflow Sensor Plausibility P2074F0: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Lower Load P2074F1: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Medium or High Load Secondary DTC(s) below may also be stored: C136081: ESP Irreversible Error C161308: CAN Signal Error EMS C161386: CAN Signal Error EMS C169381: Blind-Spot Collision Warning CAN signal failure - ESC C174181: ESC Not Available VSM (Check ESC) C183586: CAN Message Failure ESC/IEB Vehicles diagnosed with DTC(s) may also experience reduced engine performance and limited power reduction mode. The ECM software revises the logic to accurately detect the amount of air the engine is receiving.

Crankcase Ventilation) system, resulting in engine oil entering the intake and contaminating the air cleaner. This bulletin describes the procedure to clean the air intake system and replace the PCV check valve and air cleaner.

engine may exhibit a MIL with DTC(s): P2074: Mass Airflow Sensor Plausibility P2074F0: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Lower Load P2074F1: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Medium or High Load Secondary DTC(s) below may also be stored: C136081: ESP Irreversible Error C161308: CAN Signal Error EMS C161386: CAN Signal Error EMS C169381: Blind-Spot Collision Warning CAN signal failure - ESC C174181: ESC Not Available VSM (Check ESC) C183586: CAN Message Failure ESC/IEB Vehicles diagnosed with DTC(s) may also experience reduced engine performance and limited power reduction mode. The ECM software revises the logic to accurately detect the amount of air the engine is receiving.

popping noise, abnormal smell from the engine compartment, rough running, or reduced power due to a misfire.

If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing

popping noise, abnormal smell from the engine compartment, rough running, or reduced power due to a misfire.

Procedure to diagnose the condition. DIAGNOSTIC TROUBLE CODES: P070500 - Transmission range sensor circuit malfunction P070512 - Transmission range sensor circuit malfunction P070514 - Transmission range sensor circuit malfunction P07051C - Transmission range sensor circuit malfunction P070600 - Transmission range sensor circuit range/performance P070661 - Transmission range sensor circuit range/performance P070696 - Transmission range sensor circuit range/performance SYMPTOMS: Malfunction Indicator Light (MIL) illuminated 5th gear fail-safe No gear indication in cluster Intermittently wont shift into D or R Intermittently wont shift out of Park Intermittent ly no engine cr ank/no start in P or N with or without MIL or DTC.

Air Fuel Ratio Imbalance (AFRI) monitor function frequency and cylinder imbalance diagnosis logic.

Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps.

This bulletin provides information on the separate components and the replacement procedure of these components.

the repair procedure and replace the related solenoid and valve body harness.

clutch transmission (8WDCT) when the vehicle sets one of the high pressure electric oil pump (HP EOP) DTCs listed below. This bulletin provides instructions to replace the 8WDCT.

one of the DTCs listed below, related to the high pressure electric oil pump (HP EOP). Follow the procedures in this TSB to update the Transmission Control Unit (TCU) to the latest sensorless logic on affected vehicles, and then perform air bleeding and transmission learning.

(transmission clutch slip in gear above limit) listed on Page 2.

improve shift quality, judder with ISG enabled and hesitation when accelerating.

equipped with an 8-speed wet dual clutch transmissions (8WDCT) that improves the touch point learning variation. Certain 8WDCTs (indicated by a new part number) received an improved clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise drivability concerns may occur.

If you are servicing a vehicle with any symptoms listed below or DTCs (listed on Page 2) , follow the Service Procedure on Page 3. SYMPTOMS: Shifter System Malfunction displayed in the cluster Wont shift into or out of gear or wont shift out of Park Incorrect gear display in cluster and/or wont start

The current version of Google Maps has 10 times the data transmission compared to the previous version. As a countermeasure, an update with a frame skip logic has been added to resolve the data congestion with Google Maps.

or symptoms listed below, refer to the Service Procedure to diagnose the condition.

Pump) connector when servicing the 8-speed wet dual clutch transmission (8WDCT). If moisture enters the HF EOP connector, this can result in corrosion and insufficient connection of the terminals.

(DCT) and associated transmission control module (TCM). Additional steps, not in the service manual, are required within GDS prior to replacing the DCT/TCM, otherwise drivability concerns and/or DTCs may occur.

This type of leak is caused by a porous casting on the rear cover of the transmission.

If you are servicing a vehicle with any symptoms or DTC listed below, follow the Service Procedure, Page 2.

This type of leak is caused by a porous casting on the rear cover of the transmission.

This procedure is necessary to reduce the transmission learning time and improve the shift quality.

The changes may vary depending on vehicle type, model, and navigation system as described in this TSB.

The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2024 2nd Navigation Map and Software Update Improvements section in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater (NAU) and updated by USB. The NAU website is https://update.hyundai.com/US/EN/navigationUpdate. For certain models equipped with a relevant Bluelink package, the software may be downloaded and applied via OTA update.

when entering radio mode and/or displays a message that reads Uneven Road Ahead, Drive carefully on the cluster along with a warning sound. Follow the procedure outlined in this bulletin to update the AVN software to resolve this condition.

when entering radio mode and/or displays a message that reads Uneven Road Ahead, Drive carefully on the cluster along with a warning sound. Follow the procedure outlined in this bulletin to update the AVN software to resolve this condition.

When Wireless CarPlay is disconnected, a pop up message Phone Not Responding. Please reconnect it and try again will appear on the radio screen. This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.

When Wireless CarPlay is disconnected, a pop up message Phone Not Responding. Please reconnect it and try again will appear on the radio screen.

(also known as DTC P14EE00) stored in the Electronic Control Unit (ECU). The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.

stored in the Electronic Control Unit (ECU). The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.

illumination for a diagnostic trouble code P2181 that is related to the Integrated Thermal Management Module (ITM). Follow the service procedure outlined in this bulletin to replace the ITM.

This battery diagnosis function displays the various battery-related faults such as: Internal short circuit Battery deterioration Malfunction of electronic parts Insufficient battery charge Normal battery Charging defect Battery diagnosis uses the battery sensor history saved for the last 30 days and ICU diagnostic communication to track battery state of charge (SOC) and current parasitic draw history.

the door regulator cables are separated from the regulator track.

Advanced Driver Assistance Systems (ADAS) modules to enable the Safe Exit Assist (SEA) warning feature.

This may be due to an irregular disconnection on Verizons communication network. Follow the procedure in this TSB to reestablish the connection via the AVN pinhole reset method.

This may be due to an irregular disconnection on Verizon's communication network. If you are experiencing issues with remote commands, or other Bluelink services, please see the instructions below to reestablish the connection via the AVN pinhole reset method.

This may be due to an irregular disconnection on Verizons communication network. Follow the procedure in this TSB to reestablish the connection via the AVN pinhole reset method.

It provides a barrier between the paint and contaminants, such as rail dust, acid rain, and industrial fallout. In rare cases, the paint can become clouded under the PPF. These spots are the result of moisture trapped between the PPF and the paint.

Junction Turning (FCA-JT) due to omitted logic.

C272246 fault code for the front camera. In the following cases, the front camera auto-calibration range may be exceeded while driving: If the front camera is not properly installed and is completely or partially detached. In case of excessive changes affecting the vehicle's balance (e.g., loading excessively heavy cargo in a specific location of the vehicle, or significant under-inflation of the tires). Specific road conditions affecting the vehicle's balance (e.g., excessive road crown) This TSB provides instructions on how to service the vehicle when the front camera related warning light(s) are triggered due to system out of calibration (DTC_C272246).

If the protective cover is not removed correctly, there is a possibility of the rubber insert and rail spring becoming partially separated on the inner side of the wiper blade, which could lead to poor wiping performance and/or possible scratching of the windshield glass. Follow the procedure in this bulletin to properly remove the windshield wiper blade protective cover on all new wiper blades.

This bulletin describes the procedure to adjust and realign the rear mufflers to correct the appearance.

After a new vehicle launch, Hyundai uses the LQMP to monitor all customer and dealer activities at a minimum of 100 days. The Sonata N Line LQMP helps improve model vehicle quality, and allows Hyundai to proactively respond to the Voice of the Customer (VOC).

For all wheel/tire balance claims, the Tire Balance Data Sheet must be fully completed including imbalance and Road Force Variation (RFV) data. The Data Sheet can be found at the end of this bulletin.