Owners have been told not to use the function until they get software upgrades.
It spans the 2014 to 2019 model years, and includes popular models like the Ram 1500 pickup truck, Chrysler Pacifica minivan, and Jeep Wrangler SUV.
Though there are no known incidents or injuries so far, the company took the pre-emptive step amid concerns that vehicles are not slowing automatically when in cruise control mode.
That will cancel cruise control. In an "an unlikely sequence of events", automatic acceleration could occur simultaneously with an electrical network short-circuit and could prevent a driver from being able to cancel cruise control, according to the company.
The company is warning owners not to use cruise control until the cars, SUVs and trucks can be fixed with a software update. Fiat Chrysler said it'll start alerting customers as soon as next week and that it's unaware of any injuries or accidents related to the flaw.
"I was able to overpower the engine with the brakes and get the vehicle to the side of the road", the driver wrote.More news: Iran Demands Oil, Bank Guarantees From The EU By End-May
The National Highway Traffic Safety Administration (NHTSA) has weighed in too, adding its own recommendation that it "strongly encourages vehicle owners to follow" FCA's warning.
"We have a remedy and a widespread network of engaged dealers who are preparing to deliver service". Recall repairs are expected to be free, with customers getting alerts potentially by next week.
A auto company is recalling almost 5 million vehicles because of a safety issue.
It was separately fined $70 million by USA regulators in 2015 for failing to report vehicle crash deaths and injuries since 2003.
Fiat Chrysler recall: Are you at risk?
In 2015, Fiat Chrysler booked a 602 million-euro ($705 million) after-tax charge, mainly for estimated future recall costs.