It said the global chip crisis drove down vehicle shipments.
Hyundai, together with affiliate Kia, is among the world's top 10 automakers by sales.
It reported a net profit of $1.10 billion for the quarter.
But the automaker warned the global chip shortage would last until at least the end of this year.
And says it expects it will take a long time to get back to normal.
The global chip crisis, triggered partly by surging demand for laptops and consumer electronics, has shuttered auto production lines globally.
And forced automakers to slash shipment forecasts.
Hyundai had turned in its best quarterly profit in about six years in the April-June quarter thanks to its conservative supply chain management.
That helped it to navigate the chip shortage better than others.
But the prolonged crisis forced Hyundai to suspend production in the third quarter.
It now plans to develop its own chips to reduce reliance on others.
