The Return of an Icon — Designed to Evolve

The rebirth of the Tata Sierra is more than the revival of a celebrated nameplate. It marks a structural shift in how vehicles are designed, deployed, and evolve over time.

The new Sierra becomes the first internal combustion engine (ICE) car from an Indian automaker to be engineered from inception as a true Software-Defined Vehicle (SDV)—with full-vehicle, standards-based Over-the-Air (OTA) updating and service-oriented remote diagnostics embedded into its architecture.

Rather than treating connectivity as an add-on, Tata Motors integrated software lifecycle management as a core engineering principle. The vehicle platform is architected so it can be continuously improved, managed, and maintained across its operational life — not just at launch.

A Bit of History

When Tata Motors first introduced the Tata Sierra in the early 1990s, it stood out as a bold and unconventional SUV — recognizable by its distinctive wraparound rear glass and upright, confident stance. It became an icon not merely for its design, but for what it represented: aspiration, capability, and a distinctly Indian interpretation of modern mobility.

Reviving the Sierra signals more than nostalgia. It reflects Tata Motors’ intent to reconnect with a powerful brand legacy while redefining it for a new generation — blending heritage with contemporary technology, digital architecture, and software-defined capability. The new Sierra carries forward the emotional equity of the original, while positioning the nameplate as a platform for the future of connected, continuously evolving vehicles.

Distributed SDV Enablement for an IC Engine car (today’s Architecture)

While High Performance Compute (HPC) architectures represent an exciting evolution in the SDV journey, today's IC Engine vehicles — built on proven, distributed ECU architectures — are already fully capable of embracing the SDV philosophy. These platforms demonstrate that SDV enablement is less about hardware topology and more about intelligence, connectivity, and adaptability. Through intelligent orchestration of distributed ECUs, underpinned by a standardized, secure, and scalable OTA backbone, today's IC Engine vehicles can deliver the hallmark SDV promise — continuous improvement, remote configurability, and over-the-air evolution — right now, on the road today.

At the center of the Sierra’s SDV architecture is the eSync™ OTA platform from Excelfore, deployed in the cloud on Amazon Web Services IoT Core, enabling full lifecycle software management across legacy and domain-based E/E architectures via the vehicle gateway or TCU.

This implementation enables:

• Secure end-to-end ECU firmware and software updates
• Differential and delta-based update delivery
• Rollback and recovery mechanisms
• Multi-domain and multi-ECU campaign orchestration
• Bi-directional data flows between cloud and vehicle

Updates are executed through the gateway ECU using UDS/DoIP over CAN or Ethernet, with sequencing strategies to manage power, safety and network constraints. Such architecture transforms traditional IC Engine vehicles into manageable software platforms – enabling post production feature enhancements, calibration updates, and remote diagnostics. This paves way for future migration toward centralized SDV architectures.

Centralized/HPC SDV Orchestration (future-ready architecture)

While distributed OTA enables incremental transformation toward Software-Defined Vehicles (SDVs), The next-generation architecture extends these capabilities into centralized High-Performance Computing (HPC) domains—bringing compute and vehicle control into a unified framework.

Together, both platforms integrate seamlessly, enabling TMPV to adopt a unified platform approach across both cloud and edge environments, while supporting rapid deployment and scalable vehicle software management.

Integrating CI/CD pipelines with the eSync OTA platform enables continuous software delivery for the Tata Sierra’s Software-Defined Vehicle (SDV) architecture. Once software passes automated build, testing, and validation stages in the pipeline, it is packaged and securely deployed over-the-air to the vehicles, enabling faster innovation, rapid feature enhancements, and efficient lifecycle management of vehicle software.

The OTA capability spans the complete electrical/electronic (E/E) architecture — from high-performance compute platforms down to distributed ECUs and smart controllers. This is not merely an update mechanism. It is the operational backbone that allows Tata Motors and its supplier ecosystem to manage software complexity systematically over time.

Open, Standards-Based Development: An Ecosystem Approach

The Sierra’s software-defined architecture reflects a deeper philosophy: long-term vehicle development must be collaborative and standards-driven.

By adopting open industry standards, Tata Motors Passenger Vehicles enables Tier-1 suppliers and internal engineering teams to manage, extend, and maintain the vehicle platform over its lifecycle without being constrained by proprietary silos. The approach supports interoperability, reduces integration friction, and future-proofs the architecture against supplier churn or technology shifts.

Innovation at SDV scale is costly and complex, often requiring collaboration across companies and industries. Standards organizations can play an important role in enabling this collaboration and supporting continuous improvement across the ecosystem.

The eSync Alliance, working in collaboration with other standards bodies such as ASAM, is driving precisely this kind of shared innovation model. Through coordinated development and multi-company participation, the ecosystem advances faster and more cost- effectively than isolated proprietary efforts.

For Tata Motors Passenger Vehicles (TMPV), this ecosystem-driven approach ensures that the software-defined architecture remains adaptable, interoperable, and economically sustainable across its lifecycle.

Standardization as a Strategic Infrastructure

eSync based OTA

The eSync Alliance specification provides a multi-company framework for secure, bi- directional data exchange between cloud infrastructure and in-vehicle devices. This eliminates proprietary lock-in and enables:

• Supplier interoperability
• Scalable multi-platform integration
• Long-term maintainability
• Ecosystem-driven innovation
  

SOVD (Service-Oriented Vehicle Diagnostics)

SOVD, defined by ASAM, abstracts diagnostics from transport-level constraints and legacy protocol dependencies. The Sierra platform therefore supports:

• Remote fault triage
• Secure cloud-initiated diagnostic sessions
• Backend and service tool integration
• Clean separation between diagnostics logic and communication stacks

Together, eSync and SOVD provide a standards-based operating model for vehicle software lifecycle management.

A Holistic Organizational Shift at Tata Motors

From Tata Motors’ perspective, the adoption of eSync was not a tactical integration decision — it was a holistic organizational learning process.

Engineering, connected car teams, supplier management, cybersecurity, backend infrastructure, and program leadership collectively evaluated long-term lifecycle requirements. Through this cross-functional journey, the organization concluded that standards-based infrastructure would best support Tata’s next-generation vehicle management strategy.

“Our adoption of eSync was not simply a technology choice; it was an enterprise- level decision. Through the integration process, our teams gained a deeper understanding of how standards-driven OTA and diagnostics create transparency, interoperability, and long-term sustainability. We are building vehicles that are meant to evolve, and standards provide the foundation for that evolution.”

— Vaisakh Venugopal, Tata Motors

This was not just the deployment of a stack. It was the institutionalization of a software lifecycle mindset across the company.

The Ecosystem Perspective

For Excelfore, this deployment reinforces a broader industry reality: no single OEM or supplier can independently fund and sustain long-term SDV innovation at scale.

“Innovation in Software-Defined Vehicles is capital-intensive and continuous. That is precisely why standards bodies and ecosystems exist — to distribute innovation cost, accelerate maturity, and ensure interoperability. The collaboration between

Tata Motors, AWS, and the eSync Alliance demonstrates how ecosystem-driven innovation enables production-grade SDV platforms. It truly takes a village.”

— Shrikant Acharya, CTO, Excelfore

Through collaboration between the eSync Alliance and standards organizations such as ASAM, continuous improvement becomes structurally embedded into the vehicle software lifecycle. Only standards organizations can evolve through structured collaboration across OEMs, Tier-1s, tool vendors, and cloud providers. That collective evolution ensures that platforms remain current, secure, and interoperable over decades.

Why This Matters to Indian OEMs

The Sierra establishes several important precedents for the Indian automotive ecosystem:

1. First mainstream IC Engine SDV in India with full-vehicle, standards-based OTA.
2. Cloud-connected diagnostics using ASAM SOVD, not proprietary diagnostic silos.
3. Holistic enterprise adoption of standards, not isolated feature integration.
4. Ecosystem-aligned supplier model, reducing long-term integration friction.
5. Lifecycle value creation, enabling vehicles to continuously improve post-sale.

For Indian OEMs competing globally, SDV capability must extend beyond infotainment updates or telematics features. It requires structured lifecycle management of software across the entire E/E architecture.

The Sierra demonstrates that this transformation is not theoretical — it is operational, scalable, and production-proven.

Continuous Innovation as a Core Capability

By combining, eSync OTA, ASAM SOVD and AWS IoT Core, Tata Motors and Excelfore have established the Sierra as a continuously improving vehicle platform — where innovation is delivered dynamically over time. The return of the Sierra is therefore not merely nostalgic. It signals a shift in the Indian automotive industry:

Software is no longer a feature layer. It is the operational backbone that enables vehicles to evolve.

Note: All mentions of “Tata Motors” refer to the “Tata Motors Passenger Vehicles Ltd” organization.

About the Authors:-

Vaisakh Venugopal is General Manager for the Connected Car Digital Platform at Tata Motors Passenger Vehicles Ltd., where he leads the development of next-generation Software Defined Vehicle ecosystems spanning silicon to cloud. With experience across connected vehicles, AI, cybersecurity, and data science, he drives innovation in OTA updates, digital twins, 5G connectivity, and automotive cybersecurity. A published researcher and patent holder, Vaisakh is passionate about building scalable products and teams that shape the future of mobility.

Shrikant Acharya is CTO and co-founder of Excelfore, where he drives the company’s technology roadmap & partnerships. He is a serial entrepreneur, and also serves on the board the eSync Alliance. In addition to his work in cloud-to-device communications he has been an early advocate for Ethernet AVB/TSN, achieving the first AVnu-certified AVB talker & listener stacks in 2017. He is a frequent speaker at industry technical conferences and forums. He holds over a dozen patents.