The 2020 Hyundai Sonata faced reports from some owners regarding issues with its dual-clutch transmission (DCT), notably jerky or delayed shifts during low-speed driving. This was particularly noticeable in stop-and-go traffic, often linked to transmission software calibration or the clutch pack's overheating protection mechanism. Hyundai has addressed these concerns through Technical Service Bulletins (TSBs), offering software updates to refine shift logic.
While DCTs deliver better fuel efficiency and quicker shifts than traditional automatics, their design inherently trades off some low-speed smoothness. Staying on top of maintenance—like checking transmission fluid condition and updating ECU software—can mitigate most quirks. If you encounter unusual noises or warning lights, visit a dealership immediately for diagnostics; early action prevents costlier repairs down the road.
For used-car shoppers: Always review the transmission service history and confirm all manufacturer-recommended updates have been applied.
