Fiat said its net earnings came in at €435 million - 82 percent more than in the same quarter last year.
This was more than had been expected by analysts polled by Dow Jones Newswires who had forecast a result of €305 million.
Without counting the Chrysler accounts, however, Fiat clocked a net loss of €247 million - about the same as in the second quarter of 2012.
Fiat also said its turnover had grown by 4 percent to €22.3 billion over the 12-month period, while debt had gone down to €6.7 billion.
The group confirmed its targets for 2013.
It forecast a net profit this year of between €1.2 billion and 1.5 billion and a turnover of between €88 billion and €92 billion.
On the Milan stock exchange, trading in Fiat shares was suspended after they plunged 4.76 percent, while the benchmark index was up 0.55 percent.