The child's body had burn marks on the neck, face and head, according to the police.
Karan Pandey had left his home in the afternoon to play in the neighborhood with a couple of friends. Apparently, he got into the abandoned car parked in an open area to escape the heat. Police believe the five-year-old accidentally got trapped in it.
His family and the police searched for hours before they found Karan limp inside the hot car. His skin was burnt from the metal parts.
"The car accidentally got locked and the boy could not get out. He remained trapped inside for nearly six hours before his body was found," police officer Pratima Navale told news agency IANS.
It is not known who owns the car or left it parked there for weeks.
The police have filed a case of accidental death and are investigating.
(With inputs from agencies)