TL;DR: Nissan Motor and Honda Motor signed a joint development agreement on Aug. 31, 2026, to standardize core electronic control units and vehicle software for next-generation software-defined vehicles planned from fiscal year 2029 onward.
TOKYO — Japanese automakers Nissan Motor Co., Ltd. and Honda Motor Co., Ltd. said Monday that they have entered a joint development agreement covering the electronic and software core of future cars, with application planned from fiscal year 2029 onward, according to the Associated Press.
The announcement describes a completed agreement between the two companies, not a future negotiating target. The underlying vehicle application is future: the electrical/electronic architecture using the jointly developed parts and programs is planned for use in both brands' next-generation software-defined vehicles, or SDVs, from fiscal 2029 onward, according to the Honda Global Corporate Website.
The deal centers on standardization. Nissan, based in the port city of Yokohama, and Tokyo-based Honda will establish common specifications for multiple core control units and related software, then use that shared foundation in their respective future SDVs, according to the Associated Press.
What the companies signed on Aug. 31
Nissan and Honda said they concluded a joint development agreement to standardize multiple electronic control units that form the core of next-generation SDVs, along with the in-vehicle operating system and key parts of the middleware and vehicle control software that operate on those units, according to Honda Global Corporate Website.
The same statement was issued through Nissan channels, with Nissan Motor Co., Ltd. and Honda Motor Co., Ltd. listed as the parties to the agreement dated Aug. 31, 2026.
The Wall Street Journal reported that the automakers signed the joint development agreement on Monday and aim to adopt the architecture incorporating the jointly developed systems and software in vehicles from the fiscal year starting in April 2029, according to The Wall Street Journal.
The Journal also placed the signing after a planned merger fell through last year, describing the software pact as cooperation following that collapsed combination effort.
What technology is covered
The technical scope includes multiple core units within the E/E architecture of next-generation SDVs, plus the in-vehicle operating system and key parts of the middleware and vehicle control software, according to Honda Global Corporate Website.
The companies define the covered hardware as high-performance main ECUs, described as High Performance Computers that use SoCs, and zone ECUs that oversee each area of the vehicle, according to Honda Global Corporate Website.
Under the agreement, the companies will work together to establish common specifications for those core ECUs, the operating system and selected middleware elements, and vehicle control software, according to Honda Global Corporate Website.
Monday's agreement did not specifically mention electric vehicles or any model names, and was focused on so-called software-defined vehicles, which could include EVs, according to the Associated Press.
Those SDVs were described as vehicles that have functions and features that can be updated and controlled by software, rather than the mechanics of hardware, according to the Associated Press.
Why Nissan and Honda say software is central
Nissan and Honda said the software domain centered on SDVs is key to vehicle intelligence and electrification, and identified it as an important area of collaboration, according to Honda Global Corporate Website.
They pointed to the rapid pace of technological innovation and the need to strengthen competitiveness through improved research-and-development speed and investment efficiency, according to Honda Global Corporate Website.
The companies said they had conducted extensive studies on potential collaboration in the software domain before reaching the decision to jointly develop and standardize the core ECUs and software that underpin next-generation SDVs, according to Honda Global Corporate Website.
“Recognizing the need to strengthen competitiveness through faster development cycles and more efficient investment, the two companies have conducted extensive studies on potential collaboration in the software domain,” the companies said in a joint statement.
By standardizing these foundational technologies, Nissan and Honda aim to leverage their combined engineering expertise and development resources to improve efficiency, accelerate innovation, and enhance competitiveness through reduced development costs and greater economies of scale, according to Honda Global Corporate Website.
Sharing components and collaborating on research will help cut costs and speed up development, as well as add efficiency in economy of scale once the vehicles go into production, according to the Associated Press.
Talks that began in 2024
Nissan and Honda started talks in 2024 to work together in developing electric vehicles and auto intelligence technology, according to the Associated Press.
As part of their strategic partnership, Nissan and Honda continue to explore opportunities for collaboration across a range of areas to accelerate progress toward carbon neutrality and help realize a future with zero traffic fatalities involving their vehicles, according to Honda Global Corporate Website.
As part of that partnership, the companies will continue to explore other opportunities for collaboration across a range of areas, including zero-emissions and decreasing traffic fatalities, according to the Associated Press.
Both sides stressed that the use of intelligence and electrification technology is an important focus for working together, according to the Associated Press.
Going forward, Nissan and Honda said they will continue to build on their respective strengths, explore opportunities to create new value, and deepen collaboration to bring tangible benefits to customers and society, according to Honda Global Corporate Website.
Product context: Leaf, Accord, Civic and Odyssey
The agreement itself did not name future models, but the current lineups illustrate the two companies' U.S. consumer footprint.
Nissan makes Leaf electric cars and Infiniti luxury models, while Honda makes the Accord sedan, Civic compact and Odyssey minivan, according to the Associated Press.
Monday's agreement did not attach the shared software work to any of those nameplates, and did not specifically mention EVs, according to the Associated Press.
The distinction matters for shoppers: the covered work concerns the computing and software foundation for next-generation SDVs from fiscal 2029 onward, rather than a named 2026 or 2027 vehicle refresh, according to Honda Global Corporate Website.
For consumers, the practical implication described in the reporting is that future functions could arrive or change through software control rather than requiring different mechanical hardware, because SDVs have features that can be updated and controlled by software, according to the Associated Press.
Competitive backdrop: Toyota and European groups
The global competition in the auto industry is increasingly intensifying as it moves into various technologies, such as automated driving and zero emissions, according to the Associated Press.
Each vehicle is starting to be more like a computer packed with electronic parts and software rather than the old image of the gas-guzzling engines, according to the Associated Press.
Both Nissan and Honda are overshadowed by Toyota Motor Corp., the top Japanese automaker, and working together could be a plus in competing against Toyota, according to the Associated Press.
However, Toyota has been mentioned in the past as engaging in the software talks with Nissan and Honda, although it was not part of Monday's announcement, according to the Associated Press.
Toyota is working on software with other companies like Subaru, which is part of the Toyota group, and U.S. autonomous driving technology company Waymo, according to the Associated Press.
European makers Volkswagen, BMW, Mercedes-Benz and Stellantis are working together in software development so they can share the same operating system, according to the Associated Press.
That European effort provides context for the Nissan-Honda approach: separate regional groups are pursuing shared operating-system and development strategies to manage software complexity and cost.
What happens next
The next milestone identified by the companies is application, not additional negotiation. The E/E architecture incorporating the jointly developed ECUs and software is planned for application in both companies' next-generation SDVs from fiscal year 2029 onward, according to Honda Global Corporate Website.
The Wall Street Journal specified that target as the fiscal year starting in April 2029.
The companies did not announce prices, named models, production volumes, or sales territories for vehicles using the architecture in the Aug. 31 materials.
They said they will continue to explore collaboration opportunities while building on respective strengths, with stated goals that include progress toward carbon neutrality and a future with zero traffic fatalities involving their vehicles, according to Honda Global Corporate Website.