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Service bulletins for the 2021 Hyundai Sonata

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.

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

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Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
22-AT-002H2022-04-08. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT. Certain vehicles equipped with 8-speed automatic transmission may experience an automatic transmission fluid (ATF) leak at the rear cover. This type of leak is caused by a porous casting on the rear cover of the transmission.
22-AT-001H2022-02-08. Service bulletin. POWER TRAIN. This TSB provides a procedure to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms or DTC listed below, follow the Service Procedure, Page 2.
21-AT-017H2021-11-06. Service bulletin. POWER TRAIN. : Certain vehicles equipped with 8-speed automatic transmission may experience an automatic transmission fluid (ATF) leak at the rear cover. This type of leak is caused by a porous casting on the rear cover of the transmission.
21-AT-009H2021-08-07. Service bulletin. POWER TRAIN. This TSB provides a procedure to diagnose the push button shifter operation.
21-AT-007H2021-07-09. Service bulletin. POWER TRAIN. 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. • 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 won’t shift into D or R • Intermittently won’t shift out of Park • Intermittent ly no engine cr ank/no start in “P” or “N” with or without MIL or DTC.
21-01-040H2021-06-10. Service bulletin. POWER TRAIN. This bulletin describes the procedure to update the Shift Control Unit (SCU) for Shift-by-Wire vehicles (SBW). The update improves the display in the cluster.
20-AT-005H-12020-11-06. Service bulletin. POWER TRAIN. 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.
20-AT-020H2020-10-08. Service bulletin. POWER TRAIN. 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.

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