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Service bulletins for the 2021 Hyundai Elantra

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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
22-EM-010H2022-08-05. Service bulletin. ENGINE AND ENGINE COOLING. Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly replacement.
218/231 amend2022-07-09. Service bulletin. 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 bearing.
22-HC-001H2022-06-10. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. If you are servicing an applicable model with Hybrid Drive Motor (Traction Motor) improper operation or any DTC listed in the related shop manual, Motor Control System, refer to the shop manual for diagnosis. If the diagnosis indicates a faulty hybrid drive motor, refer to the Service Procedure and replace the hybrid drive motor.
22-01-032H2022-04-08. Service bulletin. ENGINE AND ENGINE COOLING. On certain 2021 Elantra and 2022 Kona vehicles equipped with 2.0L engine, a coolant leak at the Water Temperature Sensor (WTS) may be observed due to machining burrs at the mounting port of the cylinder head, resulting in improper coolant sealing.
22-BD-001H2022-02-08. Service bulletin. STRUCTURE; EQUIPMENT. Certain 2021MY Elantra vehicles may exhibit paint delamination on the left, right and lower moldings of the front bumper. Follow the procedure outlined in this bulletin to remove and replace the dark chrome front bumper moldings.
22-01-007H2022-02-08. Service bulletin. POWER TRAIN; EQUIPMENT. Certain vehicles equipped with 7-speed Double Clutch Transmissions (DCT) may exhibit abnormal shifting caused by an out of specification input shaft snap ring. This bulletin outlines the procedures for inspecting for 1-2 or 2-1 shift shock and replacing the input shaft snap ring.
21-01-056H2021-08-07. Service bulletin. ELECTRICAL SYSTEM. Some 2021 Elantra (CN7) vehicles may exhibit a condition with multiple warning lights displayed on the instrument cluster and various symptoms; multiple DTCs (Diagnostic Trouble Code), reduction in power steering assist, and not able to shift out of Park. Possible DTCs set are: • C181287 – CAN Time-out Gateway • C181208 – CAN Time-out Gateway • C180581 – LKAS CAN Signal Error • C181887 – CAN Time-out BCA • B109052 – TCU Missing Error
21-01-048H2021-07-09. Service bulletin. ENGINE AND ENGINE COOLING. On certain 2021-2022 Elantra vehicles, a coolant leak at the Water Temperature Sensor (WTS) may be observed due to machining burrs at the mounting port of the cylinder head, resulting in improper coolant sealing.
21-GI-005H2021-06-10. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information regarding the use of window mounted lockboxes without RFID shielding, which may cause battery drain on dealer stock vehicles. The lockbox is still within the range of the receiver when it is mounted to the rear window. This will cause the key fob to continuously transmit a RF (radio frequency) to the receiver. It is recommended to use a lockbox with RFID shielding to block the RF signal and prevent battery drain.
21-01-043H2021-06-10. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information related to the Engine Control Module (ECM) software update for 2021MY Elantra (CN7/CN7A) vehicles equipped with the 2.0L engine to update the ECM logic for the following conditions and DTCs: • Incorrect learning of the fuel adaptive values can occur if the engine is started at 14⁰F (-10⁰C) or colder ambient temperatures. If incorrect values are learned, the engine may stall when coming to a stop or at idle. DTC P016C: Closed Loop Air/Fuel Ratio Control at Limit-System Too Lean may be detected. The ECM software revises the logic for fuel adaptation learning and improves engine performance at idle. • The ECM software also revises the blower motor control duty cycle logic for DTC P1CD0: Air Blower Motor Inverter Performance.
21-BE-007H2021-05-05. Service bulletin. EXTERIOR LIGHTING. Some 2021 Elantra (CN7a) rear combination lamp turn signal light bulbs may prematurely become inoperative. This bulletin describes the procedure to replace the rear combination lamp turn signal light bulbs for both the right and left side.
21-EM-004H2021-04-07. Service bulletin. EQUIPMENT; ENGINE AND 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.
21-BR-002H2021-04-07. Service bulletin. SERVICE BRAKES; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin provides best practice recommendations when performing brake service procedures.
21-EM-003H2021-04-06. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.
21-01-017H2021-04-06. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This bulletin provides the service procedure to update the Transmission Control Unit (TCU) software for certain Elantra (CN7/CN7a) vehicles equipped with the 2.0L MPI and Intelligent Variable Transmission (IVT). This update to the damper clutch logic is to address a potential engine stall condition immediately following Forward Collision Avoidance (FCA) activation under specific operating conditions at low engine RPM and low vehicle speeds. In the event a low-speed stall does occur, the engine can immediately be restarted.
21-BE-002H2021-03-05. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM. This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.
21-01-007H2021-02-06. Service bulletin. 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. This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.
20-BE-014H2021-01-09. Service bulletin. 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.
20-GI-006H2021-01-09. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin provides information on the Launch Quality Monitoring Process (LQMP) for the 2021MY Hyundai Elantra. After a new vehicle launch, Hyundai uses the LQMP to monitor all customer and dealer activities at a minimum of 100 days. The Elantra LQMP helps improve model vehicle quality, and allows Hyundai to proactively respond to the Voice of the Customer (VOC).
20-BR-002H2020-12-08. Service bulletin. SERVICE BRAKES. This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
20-SS-004H2020-12-08. Service bulletin. WHEELS; TIRES. 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.

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