Karl - I hope you read this.
TML needs strong customer advocates who can help your team build better products. I would suggest that you create Regional User Groups per product (Indica/Vista, Manza, Safari/Storme, Nano, Sumo) or per city. Assign a TATA Motors leader (GM, DGM, VP) as chief sponsor for each regional user group per city. The leader MUST lead/attend every quarterly user group meeting. As the user group matures, the users can lead the meetings by themselves and TML can take a back seat.
The idea is to run quarterly user group meetings, incent user involvement (for example) include free inspection camps (led by dealers/partners). Get feedback from the user group meetings; have Tata engineers & quality champions meet customers first hand and hear the voice of customers. Get the market feedback to the designers directly. Make your key leaders as brand advocates and empower them. Create strong customer advocates in each region and involve them for product design, test drives, etc.
Over the next 3 months, start with 6 user groups (Mumbai, Pune, Delhi, Bangalore, Kolkatta, Chennai). Then expand this to 12-18 cities in India. Run an annual user conference, invite RUG members for meaningful dialogue & discussions.
In the end, you need to find a good way to expose your engineers & leaders directly to the pain and thrill that your customers experience. That's the best way to fix TML's quality issues and market perception.