The recalls bring the newly merged company's total for the year to 6.4 million vehicles worldwide and 5.1 million in US as it continues to struggle with reliability problems.
The total is short of Chrysler's annual record for recalls of 7.7 million set in 2000.
On Tuesday, its longtime quality chief abruptly left after Fiat Chrysler performed poorly in Consumer Reports magazine's annual reliability rankings.
The largest of two recalls announced yesterday covers almost 382,000 Ram 2500 and 3500 pickups and Ram 4500 and 5500 chassis cabs from 2010 through 2014.
In trucks with 6.7-liter Cummins diesel engines, corrosion on a fuel heater terminal could cause overheating, fuel leaks and fires. Chrysler is not aware of any fires or injuries.
Owners could be warned by an odor of diesel fuel. Customers will be notified by letters starting in December. Dealers will install upgraded terminals and fuel heater housings could be replaced.
The second recall covers more than 184,000 Jeep Grand Cherokee and Dodge Durango SUVs from 2014. A debris cover over a circuit board in the steering column control module can disrupt communications and disable the stability control.
The problem was discovered when dealers started gettingreports from customers that electronic stability control warning lights were coming on.
Fiat Chrysler says it knows of no crashes or injuries caused by the problem. Technicians will upgrade software to fix the SUVs, and customers will be notified in December.
Fiat Chrysler has issued 33 global recalls and 27 in US so far this year.
Doug Betts, its longtime quality chief, left the company to pursue other options after Consumer Reports' survey-based rankings this year showed four Fiat Chrysler brands at the bottom of its list.
Dodge, Ram, Jeep and Fiat performed worst of 28 brands ranked by the magazine.
Company spokesman Eric Mayne said Fiat Chrysler's recalls average fewer than 200,000 vehicles each, below the industry average of 301,000.
That means the company is responding quickly to problems, he said, adding that eight of its 27 US recalls were announced before the company received any consumer complaints.