Hyundai Sonata Hybrid
Problems & Worst Years

Two widely separated model years make up the Sonata Hybrid's complaint file, and each has its own distinct flavor of trouble. The 2016 model draws the larger total at 126 complaints across 12 distinct problems, none rated safety-critical, led by check engine lights paired with hybrid system errors (20 reports) and engine stalling during operation (18 reports) — both suggesting the hybrid powertrain's transition between gas and electric power doesn't always go smoothly. Unpredictable acceleration issues, also cited 18 times, compound that concern, while engine knocking tied to internal combustion failure (15 reports) and a more general hybrid system failure causing loss of power (10 reports) fill out the rest. A recall, 20V746, applies to this model year.

The 2021 model year is a much smaller file — just 73 complaints spread across only 3 distinct problems, and none of them rated safety-critical. Random 12-volt battery failure leads at 34 reports, a notably electrical rather than powertrain-driven concern, followed by automatic emergency braking system malfunctions (20 reports) and engine overheating (19 reports). No recall campaigns are attached to this year in the data.

The gap between these two years — both in total complaint volume and in which systems dominate — makes it hard to draw a single throughline for the Sonata Hybrid as a nameplate; the 2016 car's problems center on the hybrid drivetrain's stalling and acceleration behavior, while the 2021 car's much shorter list points instead at a battery and driver-assist system concern. With so few years represented, and the newer one naturally having had less time on the road to generate reports, it's worth being cautious about reading too much into either single year. As always, these counts reflect what owners chose to report to NHTSA rather than a controlled measurement of defects, and a pre-purchase inspection along with the car's service history will tell a buyer more than the raw numbers.