Jennings was arrested at 12:44 p.m. ET Wednesday and released at 3:41.
Jennings denied the DUI allegation Wednesday night via Twitter.
I do apologize for speeding, but DUI?? That's not me!! Sorry for speeding guys!
— Tim Jennings (@HennOrJenn26) January 8, 2015
"We are aware of the reports regarding Tim Jennings' arrest," the Bears said in a statement. "We are currently gathering information to learn more about the circumstances surrounding the situation."
According to the Gwinnett County Sheriff's Department, Jennings, 31, was held on charges with bonds totaling $2,711.
Jennings is coming off a subpar 2014 campaign in which he contributed 50 tackles in 16 starts with seven pass breakups and one forced fumble. The team signed Jennings to a four-year, $22.4 million extension last January, when former general manager Phil Emery said the deal was "rewarding excellence" for a veteran who took on the responsibilities in 2013 as a No. 1 cornerback after Charles Tillman suffered a season-ending injury.
Jennings' deal was worth $11.8 million guaranteed and included a $3 million signing bonus.
Jennings earned a trip to the Pro Bowl in 2012, and between that year and '13, the veteran picked off 13 passes, which at the time ranked No. 2 in the NFL behind Seattle's Richard Sherman.
At the end of this past season, Jennings placed the blame on the players and not the coaches for the Bears' 5-11 record, and said he hoped the next head coach would help the defense to regain its identity.
Marc Trestman was fired as head coach along with Emery late last month.