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Honda and Nissan’s 2029 Software Deal: Shared ECUs, Operating System and Vehicle Controls
Honda and Nissan will jointly develop and standardize core ECUs, the in vehicle operating system, key middleware and vehicle control software for next generation software defined vehicles from fiscal 2029 onward. The deal follows cooperation talks that began in 2024 and comes after their proposed corporate combinati...
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Key takeaways
- Honda and Nissan will jointly develop and standardize core ECUs, the in vehicle operating system, key middleware and vehicle control software for next generation software defined vehicles from fiscal 2029 onward.
- The deal follows cooperation talks that began in 2024 and comes after their proposed corporate combination collapsed in February 2025; Mitsubishi Motors may participate in related work, but the announced ECU and softw...
- Separately, Honda is prioritizing a three year automotive reset centered on hybrids, with a target of more than ¥1.4 trillion in consolidated operating profit by March 2029 and 15 next generation hybrid models by Marc...
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openai.comCreate a landscape editorial hero image for this Studio Global article: What does Honda and Nissan’s new joint development agreement entail—including their plan to standardize core electronic control units, the i. Article summary: Honda and Nissan have chosen a technology-sharing alliance rather than a corporate combination: they will jointly develop standardized “digital backbone” components for future software-defined vehicles, with deployment p. Topic tags: general, general web, user generated, government, news. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermar
Honda and Nissan have signed a narrower technology partnership after their broader merger talks failed: they will jointly develop the computing and software foundation for next-generation software-defined vehicles (SDVs). The companies plan to use an electrical/electronic architecture incorporating those shared elements in new vehicles from fiscal 2029 onward. 17
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What Honda and Nissan will develop together
The agreement covers several layers of an SDV’s core architecture:
- Core electronic control units (ECUs): the computers that manage vehicle functions. The companies plan to establish common specifications for multiple core ECUs, including high-performance main computers and zone ECUs.
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- In-vehicle operating system: the basic software layer that supports applications and vehicle functions.
- Middleware: key software components that connect the operating system, vehicle computers and higher-level functions.
- Vehicle-control software: software that runs on the jointly developed ECUs and controls vehicle systems.
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The practical objective is to share development of the underlying “digital backbone” while leaving room for Honda and Nissan to build distinct vehicles and customer experiences on top of it. The agreement therefore represents engineering and technology integration, not the creation of a single automaker.
Why standardized ECUs and software matter
Software-defined vehicles depend on increasingly centralized computing, software platforms and networked electronic systems. Developing those foundations independently is expensive and can require each automaker to solve many of the same hardware, software and integration problems.
Honda and Nissan’s stated approach is to establish common specifications and jointly develop the components. That can reduce duplicated engineering work, create economies of scale and help the companies spread the cost of developing more advanced vehicle technology. 20
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The planned 2029 rollout is also significant because the shared architecture is intended to span both companies’ next-generation SDVs rather than a single model or one-off project. Vehicles using the jointly developed ECUs and software are planned from fiscal 2029 onward; in this context, fiscal 2029 runs from April 1, 2029, to March 31, 2030. 20
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How the agreement fits their recent history
Honda and Nissan began exploring cooperation in 2024, including work related to electrification and software. 22 They later pursued a much broader corporate combination, but those merger discussions ended in February 2025.
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The new agreement is a different form of cooperation: the companies can share selected technology development without combining their corporate ownership or operations. That narrower structure lets them target some of the automotive industry’s most expensive technology work while keeping the two brands and companies separate.
What about Mitsubishi Motors?
Mitsubishi Motors has been involved in wider strategic-collaboration discussions connected to Nissan and Honda. However, the announced joint development agreement for standardized ECUs and software is identified as a Honda–Nissan agreement. Mitsubishi’s participation in related SDV work has been described as possible or expected, rather than as part of the signed agreement itself. 17
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Honda’s separate three-year automotive reset
The software partnership should not be confused with Honda’s separate business strategy announced in 2026. Honda is rebuilding its automobile operation over the three fiscal years through March 2029 and is targeting consolidated operating profit of more than ¥1.4 trillion—including its motorcycle and financial-services businesses—for the fiscal year ending March 31, 2029. Honda describes that as an all-time-high target. 10
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A major push into next-generation hybrids
Honda plans to begin launching next-generation hybrids in 2027 and introduce 15 such models globally by the end of the fiscal year ending March 31, 2030, with North America as the main initial focus. It also plans larger D-segment-and-above hybrids in North America in 2029. 2
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The company’s technical targets include reducing the cost of its next-generation hybrid system by more than 30% compared with its 2023 system and improving fuel economy by more than 10% when the system is combined with a new platform and electric all-wheel-drive unit. 2
Production and investment are shifting toward hybrids
Honda plans to use excess capacity at its Ohio automobile plants for gasoline and hybrid production and make all of its North American automobile plants capable of producing hybrids. It also plans to convert part of the EV-battery production lines at its L-H Battery Company joint venture with LG Energy Solution to hybrid-battery production. 2
Across gasoline and hybrid vehicles, software and EVs, Honda has outlined ¥6.2 trillion in investment through fiscal 2029. At the same time, it has suspended its planned Canadian EV value-chain project indefinitely while reassessing its EV strategy and reallocating resources toward hybrids. 4
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The “Triple Half” development target
Honda also wants digital engineering environments, AI and changes to product planning and development management to cut development cost, lead time and workload by 50% compared with 2025 levels. The company says minor model-change development time will be halved immediately, while the same target will apply to full model changes whose development begins in 2028. 14
North America, Japan and India are priority markets
Honda has identified North America, Japan and India as priority regions for the reset. In India, it plans to introduce market-specific vehicles from 2028 in the sub-four-meter and midsize segments. The strategy also connects Honda’s large Indian motorcycle business with its effort to attract customers moving from two-wheelers into cars. 1
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The bigger picture
Taken together, the announcements show two parallel priorities. Honda is using hybrids and manufacturing flexibility to improve near-term automobile economics, while Honda and Nissan are sharing the software and computing infrastructure they expect to need for the longer-term shift toward SDVs.
The 2029 agreement does not promise identical Honda and Nissan vehicles. Its central commitment is to standardize selected underlying ECUs and software so both companies can share development effort and scale while continuing to compete through their own products, brands and market strategies.
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Honda and Nissan will jointly develop and standardize core ECUs, the in vehicle operating system, key middleware and vehicle control software for next generation software defined vehicles from fiscal 2029 onward.
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Honda and Nissan will jointly develop and standardize core ECUs, the in vehicle operating system, key middleware and vehicle control software for next generation software defined vehicles from fiscal 2029 onward. The deal follows cooperation talks that began in 2024 and comes after their proposed corporate combination collapsed in February 2025; Mitsubishi Motors may participate in related work, but the announced ECU and softw...
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Separately, Honda is prioritizing a three year automotive reset centered on hybrids, with a target of more than ¥1.4 trillion in consolidated operating profit by March 2029 and 15 next generation hybrid models by Marc...