The crash happened at about 4:38 a.m. on the eastbound lanes of I-290 at Morgan Street near the Little Italy neighborhood, Illinois State Police said.
A Chicago fire engine was blocking lanes of traffic to block a previous crash when the driver of a black 2018 Nissan crashed into it.
A firefighter in the engine was taken to an area hospital with non-life-threatening injuries, ISP said.
The driver of the Nissan arrested for driving under the influence of alcohol and was issued a citation for violating Move Over Law, also known as Scott's Law.
The expresswas was closed but all lanes reopened by 6:55 a.m.
No other information was available.