2020 Hyundai Sonata Technical Service Bulletins

103 technical service bulletins (TSBs) are on record for the 2020 Hyundai Sonata. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10200075Jul 13, 2021Transmission and drivetrain. This TSB provides a procedure to diagnose the push button shifter operation.
• 10199099Jun 22, 2021Engine cooling. This bulletin provides information related to an Electronic Control Module (ECM) software update which revises the OBD Air Fuel Ratio Imbalance (AFRI) monitor function frequency and cylinder imbalance diagnosis logic.
• 10199101Jun 14, 2021Transmission and drivetrain. If you are servicing an 8-speed front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition.
• 10190044Mar 30, 2021Equipment, Engine cooling. This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps.
• 10190038Mar 23, 2021Brakes, Equipment. This bulletin provides best practice recommendations when performing brake service procedures.
• 10189991Mar 16, 2021Equipment, Electrical system. When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message “Phone Not Responding. Please reconnect it and try again” will appear on the radio screen.
• 10189989Mar 10, 2021Equipment, Engine cooling. This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.
• 10188246Feb 11, 2021Engine cooling, Electrical system. This bulletin provides information related to an Electronic Control Module (ECM) software update which revises detection logic for DTC P2422: EVAP System Restricted Vent Valve logic.
• 10186825Jan 28, 2021Steering. The rack-mounted dual pinion Motor Driven Power Steering (MDPS) system components can be replaced separately from the complete assembly. This bulletin provides information on the separate components and the replacement procedure of these components.
• 10185443Dec 21, 2020Electrical system. When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message “Phone Not Responding. Please reconnect it and try again” will appear on the radio screen.
• 10185437Dec 18, 2020Equipment, Body and structure, Visibility (wipers, defrost, mirrors). This bulletin describes the procedure to replace the front door module assembly if the front door window cannot close or the door regulator cables are separated from the regulator track.
• 10183963Nov 30, 2020Brakes. This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
• 10183962Nov 20, 2020Visibility (wipers, defrost, mirrors). This bulletin describes the procedure to diagnose and repair a window exhibiting noise while lowering and raising.
• 10183960Nov 19, 2020Tires, Wheels. This bulletin provides tire vibration service procedures, including how to optimize vehicle vibration performance. 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.
• 10182325Oct 23, 2020Visibility (wipers, defrost, mirrors). Certain 2020MY Sonata vehicles (DN8A) may experience an inoperative air conditioning system with cold air not blowing from the vents. This condition may be caused by an electrical terminal connection in the engine room junction box. Follow the procedure in this bulletin to inspect and if necessary, repair the terminal in the engine room junction box.
• 10182314Oct 13, 2020Transmission and drivetrain. If you are servicing an applicable vehicle with a “Check Engine” light on and one or more of the DTC listed below, follow the repair procedure and replace the related solenoid and valve body harness.
• 10182304Oct 9, 2020Equipment, Electrical system. This bulletin provides information and procedures for collecting OBD “In Use Monitor Performance Ratio” (IUMPR) data on certain 2019-2021MY vehicles at California dealers. This reporting is mandated by CARB (California Air Resources Board).
• 10180985Sep 9, 2020Equipment, Steering. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft assembly.
• 10180981Sep 9, 2020Equipment, Steering. This bulletin provides information regarding replacement of the column-mounted Motor Driven Power Steering (MDPS) system as separate components.
• 10180977Sep 2, 2020Transmission and drivetrain. This bulletin provides a procedure to transfer pressure data to the TCU using GDS Mobile. This procedure is necessary to reduce the transmission learning time and improve the shift quality.
• 10179246Aug 10, 2020Electrical system, Steering. Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft assembly.
• 10179244Aug 10, 2020Steering, Electrical system. This bulletin provides information regarding replacement of the column-mounted Motor Driven Power Steering (MDPS) system as separate components.
• 10178175Jul 14, 2020Exterior lighting, Equipment. This bulletin provides information regarding condensation related to moisture accumulation in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. The 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…
• 10177134Jun 22, 2020Electrical system, Engine cooling. This service campaign information is related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak. This Service Campaign T5A will replace Service Campaign T4N.
• 10177133Jun 22, 2020Electrical system, Equipment, Engine cooling. This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P030X: Cylinder “X” Misfire Detected and P0456: EVAP System Leakage Detected – Very Small Leak.
• 10176198May 29, 2020Engine cooling, Transmission and drivetrain, Brakes. This bulletin describes the Idle Stop and Go (ISG) system operation, diagnostic and battery sensor recalibration procedure. Refer to applicable Shop Manual and Owner’s Manual for additional information.
• 10176196May 21, 2020Transmission and drivetrain. If you are servicing any of the vehicles listed below with a harsh and/or delayed shift, use the GDS as shown in the Service Procedure to measure shift engagement time.
• 10176182May 6, 2020Tires, Wheels. This bulletin provides information on tire maintenance best practices and procedures for dealers and customers to maximize tire life and performance.
• 10176178May 1, 2020Equipment. This bulletin describes the general guidelines to help disinfect and protect vehicle exterior/interior surfaces using recommended safe chemical products.
• 10174808Apr 23, 2020Electrical system, Equipment. This bulletin provides information on identifying dealer stock vehicles with either: • A Battery SOC alert - low Battery State of Charge (SOC) at or below 50%. • A 30 Day alert - vehicle has not started and reported an SOC in 30 days.
• 10174807Apr 17, 2020Equipment, Transmission and drivetrain. The automatic transmission warranty repair policy authorizes in-dealership repairs of the following components for both OEM (new) and remanufactured automatic transmissions:
• 10174805Apr 13, 2020Visibility (wipers, defrost, mirrors). This bulletin describes the procedure to diagnose and repair a window exhibiting noise while lowering and raising.
• 10174802Apr 9, 2020Equipment, Transmission and drivetrain. Certain 2020MY Sonata (DN8) vehicles may exhibit a grease leak coming from the right side, inner CV axle boot area. This bulletin describes the procedure to replace the right side CV axle boot on the differential side (inner) on certain 2020MY Sonata (DN8) vehicles.
• 10173553Mar 31, 2020Electrical system. Hyundai vehicles are equipped with Dark Current Control logic to help reduce amperage draw amount and conserve Battery State of Charge (SOC%). A selected Dark Current Control Mode will function when the vehicle is in the key off state, and will not affect vehicle functionality or performance.
• 10173546Mar 23, 2020Equipment. This bulletin describes the general guidelines to disinfect and protect vehicle interior surfaces using certain safe chemical products.
• 10173545Mar 18, 2020Electrical system. This bulletin describes the mandatory procedure to submit battery test data electronically for battery warranty claims by running the GDS Battery Claim App. The App must be run right after an incident battery is removed from the vehicle or after a battery charge is completed which qualifies for a warranty. It must be run at any time between RO open and close dates.
• 10173544Mar 17, 2020Latches, locks and linkages. This bulletin describes the procedure to repair an inside door handle exhibiting noise when opening the door.
• 10172211Feb 12, 2020Transmission and drivetrain, Engine. If you are servicing an 8-speed front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition.
• 10172146Feb 11, 2020Electrical system, Engine cooling. This service campaign provides information related to an ECM software update to revise the logic for DTC P0456: EVAP System Leakage Detected Very Small Leak.
• 10172145Feb 11, 2020Electrical system, Engine cooling. This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the logic for DTC P0456: EVAP System Leakage Detected Very Small Leak.
• 10172142Feb 5, 2020Suspension. This bulletin describes the requirements for all wheel alignment and/or vehicle tracking claims and best practices when diagnosing and conducting alignment-related repairs for all models and model years.
• 10170889Jan 27, 2020Engine cooling. If you are servicing an applicable vehicle with a Check Engine light on and one or more of the DTC listed below, follow the repair procedure and replace the related input/output speed sensor and oil pressure harness.
• 10170887Jan 27, 2020Engine cooling. If you are servicing an applicable vehicle with a Check Engine light on and one or more of the DTC listed below, follow the repair procedure and replace the related oil pressure harness with integrated oil temperature sensor.
• 10170886Jan 27, 2020Engine cooling. If you are servicing an applicable vehicle with a Check Engine light on and one or more of the DTC listed below, follow the repair procedure and replace the related solenoid and oil pressure harness.
• 10170883Jan 16, 2020Electrical system. This bulletin provides guidelines to inspect the USB, head unit, and multi-box for common connection conditions. 2. This bulletin presents guidelines to inspect for common Android Auto and Apple CarPlay connection conditions. 3. This bulletin provides physical differences between the USB 2.0 port and USB 3.0 port.
• 10170896Jan 3, 2020Steering. This bulletin provides information regarding replacement of the column-mounted Motor Driven Power Steering (MDPS) system as separate components.
• 10170900Jan 2, 2020Equipment. This bulletin describes the procedure to identify and retrieve the Unique Identification Numbers (UID) from the 20MY Sonata's Identity Authentication Unit (IAU) to enable Hyundai Digital Key.
• 10170899Jan 2, 2020Transmission and drivetrain. This TSB provides a procedure to diagnose and repair a transaxle for the following Incorrect Ratio DTC (transaxle clutch slipping more than 200 rpm in gear).
• 10170897Jan 2, 2020Electrical system. On certain Sonata (DN8) vehicles equipped with smart user features, the registered Hyundai app and the digital key card may not open the doors or start the vehicle when using these features.
• 10170514Dec 20, 2019Brakes. Hyundai is conducting a Service Campaign to inspect, and if necessary, re-route the main harness adjacent to the brake booster of certain 2020MY Sonata (DN8) vehicles.

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