Feierabend was a back seat passenger along with two other young people, who were also killed in the accident that involved just one car, said local police. The vehicle left the road and crashed into a tree.
The tragedy left everyone at the club in deep shock, a statement on Hanover's website said. "We will never forget you, Niklas," it added.
The youngster had trained with the recently relegated Hanover's first team over the winter and had been on the bench for two Bundesliga matches, although he had yet to make his debut.
"Our deepest sympathies in these difficult hours go primarily to his family and friends," said the Hanover statement.
"Rest in peace, Niky," wrote Hanover defender Alexander Milosevic on his official Twitter account. "Never alone."
Out of respect for Feierabend's family, Sunday's under-23 fixture between Hanover and VfV Hildesheim was cancelled.
(Writing by Ed Dove, editing by Ian Chadband)
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