The Milan-listed shares in the Italian car maker erased more than one tenth of their value in just 20 minutes of trading after the news broke. The stock was automatically suspended several times because of the heavy losses and was last down 13 percent.

The EPA will announce the findings at an 11 a.m. conference call, Reuters said in the source-based.

Fiat Chrysler declined to comment.

(Reporting by Agnieszka Flak; editing by Danilo Masoni)