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Service bulletins for the 2018 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.

240 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
5NP-X4D6V-012018-01-16. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Hyundai Motor America is conducting a Service Campaign to update the ECM and TCM on certain 2018 Year Sonata 2.0L turbo vehicles. Service Campaign T2Q provides a service procedure to update the ECM and TCM.
5NP-R6Y5M-012018-01-16. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This bulletin provides information related to the Engine Control Module (ECM) and Transmission Control Module (TCM) software updates for certain 2018MY SONATA, equipped with 2.0L turbo engine and 8 speed automatic transmission. These vehicles may experience Malfunction Indication Light illumination with any of the following DTC(s) below: ? P219C: Cylinder #1 Imbalance Error ? P219D: Cylinder #2 Imbalance Error ? P219E: Cylinder #3 Imbalance Error ? P219F: Cylinder #4 Imbalance Error ? P0731: Gear 1 Incorrect Ratio
5NP-Z6F3A-112017-11-14. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. Before installing an automatic transmission, check the depth of the torque converter in the case to confirm the torque converter is fully installed in the transmission. If this is not done, the oil pump may be damaged.
5NP-B9K3N-102017-10-12. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. Some Sonata Hybrid (LF HEV) vehicles may experience a small oil leak from the electric oil pump (EOP) seals. If so, follow the Service Procedure in this bulletin to inspect and repair the oil seals between the transmission and EOP. No drivability issues are associated with this condition.
5NP-B6Z4E-102017-10-12. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. The 2018 Sonata (LFA) 2.0T is equipped with an 8-speed transmission. Do not replace the transmission for any of the solenoid DTC listed below. Instead, follow the Service Procedure on Page 2 and replace the related part.

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