Tata Motors Passenger Vehicles (TMPV) and Stellantis have signed a formal agreement to expand their partnership into product technology, platforms and vehicle architecture, formalising plans for a new Jeep SUV based on the Tata Sierra’s ARGOS platform, according to people in the know. Internally codenamed J1J, the Jeep SUV will get both internal combustion engine and electric versions and it is likely to use the same powertrains as the Sierra, say people in the know.
Sierra-based Jeep SUV: platform and production plans
ARGOS stands for All-Terrain Ready, Omni-Energy and Geometry Scalable. It is TMPV’s modular, multi-energy vehicle architecture, designed to accommodate different vehicle dimensions and powertrain applications, which can open up more opportunities for Stellantis in the future.
While Tata Motors is producing the Sierra at its Sanand factory in Gujarat, production of the Jeep model is likely to take place at the Fiat India Automobiles Ltd (FIAL) joint venture facility in Ranjangaon, Maharashtra. The manufacturing operations are expected to be adapted for the programme over the next 18 months, added a person in the know.
The programme forms part of Stellantis’ wider ambition to sell 100,000 locally produced vehicles globally in 2028 across its Tata and Dongfeng partnership programmes combined, as outlined at its May 2026 Investor Day. The target covers several products. The company is likely to launch the first vehicle in the first half of 2028, say sources.
A dedicated team for the project is currently based out of Pune and will look at adapting the vehicle architecture, including a left-hand-drive version for overseas markets. A range-extender electric vehicle application is also being explored on the platform, although no production decision for the REEV has been finalised, according to people familiar with the engineering work.
An email sent to Tata Motors and Stellantis seeking comment remained unanswered at the time of publication.
The formal agreement builds on a relationship spanning more than two decades. Having collaborated on manufacturing, powertrains and the supply chain, the partners are now extending their cooperation into vehicle development.
Sierra-based Jeep SUV: Different body and cabin
Stellantis is benchmarking its own Jeep Renegade and Compass products for the J1J model development, according to company sources. Its eventual name and final production design are being firmed up.
This clearly indicates that the Jeep will have a different upper body, or top hat, exterior styling and cabin. Changes will extend to the seating package, interior features and equipment. These will distinguish it from the Sierra, while allowing the companies to share the underlying architecture and components.
Much of the platform is expected to be retained, with structural modifications and reinforcements, where required, to accommodate the Jeep body and meet crash and overseas regulatory requirements. Details of Jeep-specific suspension tuning and off-road hardware could not immediately be established. A 4×4 variant is also likely as Jeep’s brand guidelines insist on giving its customers a 4×4 option for all its models. Whilst the electric version of the Sierra already comes with 4×4, the ARGOS platform has been packaged and developed to accommodate a 4×4 ICE drive train as well. In fact, the Jeep partnership could accelerate the launch of a Sierra 4×4 to coincide with launch of the next-gen Jeep SUV.
Tata Motors sister company Tata Technologies is understood to be involved in engineering execution at Stellantis. The work includes the Jeep-specific body and interior package, left-hand-drive adaptation and changes needed to meet overseas regulations.
According to people familiar with the programme, TMPV will retain ownership of the architecture and license it to Stellantis. Existing Sierra suppliers are expected to support Jeep where components can be shared, with separate sourcing and tooling for model-specific parts.
India development, global markets
Stellantis had disclosed its intention to develop a Tata-based Jeep at its May 21, 2026 Investor Day. Grégoire Olivier, its Asia Pacific chief operating officer, said Tata Motors would provide a competitive platform for a new Jeep vehicle to be developed and assembled in India through the existing joint venture for global markets.
Olivier had also outlined exports to more than 50 countries across the wider portfolio, including the Dongfeng programmes, the Tata-based Jeep and the existing Citroën Smart Car programme in India. The markets allocated specifically to J1J have not been established.
For Stellantis, Tata’s architecture and supplier base offer a way to reduce development expenditure while adding a new Jeep product. For TMPV, the arrangement could generate licensing revenue and spread platform costs across additional vehicles. Common components could also bring suppliers higher volumes.
The alliance is a much-needed segue for the Jeep brand which has been in India for close to a decade but has been relegated to the fringes of the Indian market with a lack of product action. A licensed modular architecture with the potential for multiple powertrains, 4×4 capability and different wheelbases will open opportunities for more products in a quicker time interval.
The programme would extend the Ranjangaon venture from manufacturing cooperation to producing a Jeep on Tata’s vehicle architecture. The left-hand-drive version would widen its overseas reach, giving the plant access to demand beyond India and other right-hand-drive markets.
With inputs from Ketan Thakkar