Thursday’s start of the school year was another troubled one for an autistic Brooklyn girl, who last year missed the first full week of classes when the Department of Education failed to provide her with transportation.

Once again, no bus arrived to pick up Michaela Galicia, 9, of Flatbush.

And after hours of fruitless attempts to contact the DOE, her mom Claudia was forced to pay for a $40 Uber to get her to her special school in Harlem.

“It’s unbelievable,” Claudia Galicia told The Post. “After what we went through last year, this is just unacceptable. It’s hard enough with a child with special needs. We don’t need this.”

The exasperated mother said her daughter attends the special education school in distant Harlem because the DOE couldn’t provide a closer alternative to her liking.

But despite the long distance to class, Michaela was eager to resume school and reunite with friends, her mom said.

In preparation for the new year, the DOE’s Office of Pupil Transportation had sent Galicia a letter with a number for the bus company assigned to her daughter’s route.

But the note didn’t offer a specific pickup time, so Galicia and her daughter went outside to wait in front of their apartment building at 6:30 a.m.

With no sign of the bus at 7 a.m., Galicia had unnerving flashbacks to last year, when the DOE couldn’t get Michaela to school for the entire first week of class.

She first called OPT, but the line was busy. She then dialed the number OPT provided for the bus company. But a dispatcher told her she had called the wrong branch and gave her yet another number to call.

Galicia called that line — but was met with endless ringing.

A final call to the Bronx line concluded with a supervisor hanging up on her, Galicia said.

“It was very frustrating,” she fumed. “There is just no one taking responsibility.”

With no more numbers to call and Michaela’s spirits dimming, the fed-up mother took to Twitter to voice her anger.

She tagged Schools Chancellor Richard Carranza and other official school accounts.

“We can’t have a good day if OPT did not send the bus for children with disabilities!” she wrote.

A DOE official responded to Galicia, and she relayed her phone number in a private message.

“They called back and said they would help,” she said.

Four hours later, there was still no bus and no return call.

Hoping to salvage some portion of the school day for her downcast daughter, Galicia took a dollar van to downtown Brooklyn before ordering a $40 Uber ride to Harlem.

“I didn’t want to let her down,” Galicia said. “So we did what we had to do.”

A handful of other parents also took to Twitter Thursday and complained about absentee or late buses.

The DOE was deluged with complaints at the beginning of last year school year, ratcheting up pressure for improved service Thursday.

Despite Galicia’s dismal morning, the DOE said service was vastly improved Thursday.

“93% of routes arrived on time this morning and by 2 p.m. today we received 6,790 calls as compared to over 27,000 on the first day last year,” said DOE spokeswoman Miranda Barbot. “We’re making progress, but there is room to improve, and we’ll continue to make improvements, closely monitor service and immediately address any issues.”

Last year’s debacle cost former DOE transportation chief Eric Goldstein his job.

Mayor Bill de Blasio said bus operations were proceeding smoothly overall at a Thursday press conference.

“I’ve heard that by and large it’s going well,” he said. “But there are still some problems. I don’t like that. As a parent I don’t like that. As a mayor I don’t like that … I would say overwhelmingly the routes are working from what I’m hearing.”