The missed deadlines could bring a fine from the U.S. National Highway Traffic Safety Administration. The agency plans to hold a public hearing July 2 on the company's performance in 20 different recalls.
The missed deadlines were revealed in Fiat Chrysler's response to questions from the agency before the hearing. The response was released on Thursday.
Automakers must notify customers within 60 days after telling the government about a recall. Four of the five misses were four days or less, but one was 12 days late.
Company spokesman Eric Mayne said owners in that case had already been notified. The missed deadlines happened when the company decided to change the recall repair.