More than 50 people have reported to the National Highway Traffic Safety Administration that their Pacificas suddenly lost power

A U.S. safety advocacy group is demanding the recall of Windsor-made 2017 Chrysler Pacificas after reports of some vehicles stalling without warning.

The Center for Auto Safety said more than 50 people have reported to the National Highway Traffic Safety Administration that their Pacificas suddenly lost power. Fiat Chrysler Automobiles said Monday it is not aware of any accidents or injuries associated with the complaints.

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The safety group and a Pacifica owner from Virginia have filed a petition with the NHTSA to investigate potential problems with the vehicle.

Reports to the NHTSA, a U.S. government agency which does not verify the online complaints it receives, have included drivers being unable to accelerate, decelerate or use power steering.

“Stalling is a dangerous defect, and has repeatedly led to tragedy,” Jason Levine, executive director of the Center for Auto Safety, wrote in a statement on the group’s website. “The danger goes beyond what happens to families in the stalled minivan during the loss of power, as drivers of disabled vehicles are often hit and killed by other cars after they have pulled over to the side of the road. Chrysler needs to recall these vehicles, provide alternatives for owners in the meantime, and figure out how to fix the problem.”

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FCA has sold more than 150,000 Pacificas in the U.S. and 7,100 in Canada.

The Center for Auto Safety said that according to consumer complaints to NHTSA, the vehicles have lost power at various speeds and while idling. The reports state that some vehicles were new when they lost power, others had thousands of miles on them. A spokeswoman for NHTSA did not respond Monday to a request for comment.

Fiat Chrysler Automobiles U.S. said in a statement Monday that the company takes “seriously all concerns raised by its customers.”

The company said it routinely monitors vehicle performance using information from multiple data streams, and is in constant communication with NHTSA.

“Further, in most of the complaints of which we are aware, customers were able to restart their vehicles immediately thereafter, and the condition did not reoccur,” the company said.

The company in June voluntarily recalled nearly 1,700 Pacifica hybrids it had sold in Canada and the United States and halted production of that vehicle at the Windsor assembly plant for a short period of time. At that time, customers reported the vehicles would unexpectedly lose power and stop dead in their tracks. The company said it had pinpointed a problem with “certain diodes” that could “cause propulsion loss.”