Hyundai and Kia share many engines across their vehicle lineups. The two automakers have a close relationship, with Hyundai owning a majority stake in Kia since 1997, after Kia declared bankruptcy in 1997, leading Hyundai to acquire a 51% stake in its South Korean rival. Founded in 1944, Kia predates Hyundai, which was established in 1967, but their partnership has since grown into a deep technological and architectural cooperation.
One example of a shared engine is the 2.2-liter CRDi turbodiesel inline-4, found in models like the Hyundai Santa Fe, Kia Sorento, Hyundai Palisade, Hyundai Sonata, and Kia Carnival since 2009. This engine, built in South Korea, is generally reliable but has had issues with piezo-electronic injectors and high oil consumption, sometimes using up to 0.5 liters per 600 miles.
Shared Engines and Manufacturing
Another shared engine is the Smartstream turbocharged 2.0-liter inline-4, used in the Santa Fe, Sonata, and K5, primarily in Asian markets. A related 2.5-liter version powers the Hyundai Sonata N Line, Kia Sorento, and several Genesis models. Reports suggest this engine may also feature in next-generation Hyundai N cars. Many of these engines, including the Smartstream G2.5GDi, T-GDi, G1.6 T-GDi, and G2.0 Atkinson, are manufactured in the United States, benefiting from localized production.
Hyundai and Kia also share a 3.5-liter V6 engine, with Hyundai producing a twin-turbo variant for Genesis. This engine sharing allows both brands to split development and manufacturing costs, streamlining their supply chains.
Reliability and Warranty
While most engines are reliable, some have had issues. The 1.8-liter and 2.0-liter Nu engines, along with the 1.8-liter, 2.0-liter, and 2.4-liter Theta II engines, have been subject to recalls and a class-action lawsuit due to stalling, seizing, and fire risks. These issues affected models like the 2011-2015 Hyundai Sonata Hybrid, 2014-2021 Hyundai Tucson, 2011-2016 Kia Optima Hybrid, and 2011-2013 Kia Sportage.
In 2024, Hyundai and Kia settled the lawsuit, offering cash rebates and extending engine warranties to 15 years or 150,000 miles. American buyers can expect a 10-year/100,000-mile warranty on most models, with Hyundai further extending coverage for impacted models to 15 years/180,000 miles.
Electric Vehicles and Future Prospects
The two brands also share components in their electric vehicles, such as the 800-volt E-GMP platform used in the Kia EV6, Hyundai Ioniq 5, and Genesis GV60. The Hyundai Ioniq 3 and Kia EV4 use a 400-volt version of this architecture. However, these vehicles have experienced issues with the Integrated Charging Control Unit (ICCU), leading to recalls and extended warranties.
Design Differences
For instance, if the Hyundai Santa Fe’s design isn’t appealing, the Kia Sorento might be a better option. Similarly, those who prefer a retro feel might choose the Hyundai Ioniq 5 over the Kia EV6.
