Honda and Nissan Agree to Joint Software Development

Honda Motor Co. Ltd. and Nissan Motor Co. entered into a joint development agreement on Monday to standardize core hardware and software for software-defined vehicles. The partnership focuses on creating common electronic control units, including high-performance main computers and zonal ECUs, alongside shared vehicle operating systems, middleware, and control software. The automakers intend to deploy this technology starting in the fiscal year beginning April 2029.

This collaboration follows a failed 2025 merger attempt that collapsed over disputes regarding Nissan's ownership structure. The move serves as a strategic response to weak sales in the United States and China, as well as increasing competition from Silicon Valley technology firms and Chinese manufacturers like BYD Co. and Xiaomi Corp. Honda has specifically faced a 50% year-over-year drop in retail units in China and projected EV-related losses of JPY520 billion for the full year.

By pooling resources, the companies aim to reduce the high costs of software development and accelerate innovation cycles. Honda is also exploring separate cooperation with Mitsubishi Motors under an existing strategic partnership to further pool volume for batteries and shared platforms.