Yes, the diploma offered by a Polytechnic in Automobile Engineering College in India is recognised across the country. Most polytechnic colleges are approved by bodies like AICTE and are affiliated with state technical education boards. This makes the diploma valid for higher studies and for jobs in both the private and government sectors.
Because it is a nationally recognised qualification, you can apply for roles in automobile companies, service centres, manufacturing units, spare-parts industries, quality control departments, transport organisations, and many other fields. The recognition also allows you to continue your education by joining B.Tech Automobile Engineering or related engineering degrees through lateral entry.