UAW President Gary Jones (left) and FCA North America Chief Operating Officer Mark Stewart opened 2019 contract talks with a ceremonial hand shake during an event on July 16, 2019 at the company's North American headquarters in Auburn Hills, Mich.

DETROIT – Fiat Chrysler and the United Auto Workers union have reached a tentative deal on a new labor contract amid tumultuous times for both sides.

The UAW Bargaining Committee agreed to a deal with Fiat Chrysler to add $4.5 billion in investments, translating to 7,900 jobs over the course of a four-year deal, according to a UAW statement. The $4.5 billion comes on top of an earlier pledge of $4.5 billion for a total of $9 billion marked for new investment, UAW Vice President Cindy Estrada said in the statement.



Fiat Chrysler confirmed in a statement that it had reached a tentative deal with UAW.

Last week the UAW turned its attention to Fiat Chrysler – the last of the Detroit automakers it needs to seal a new contract with in 2019.

The agreement comes days after the resignations of two high-ranking union officials, including UAW President Gary Jones, who were connected to an ongoing federal corruption probe of the union. Jones, whose Michigan home was raided by federal agents in August, has not been charged by federal prosecutors.

It also comes nearly a month after Fiat Chrysler announced plans to merge with French automaker PSA Group.

A final agreement is likely at least a week or two away from being approved or rejected by rank-and-file union members. The UAW-Fiat Chrysler National Council will meet on Dec. 4 to go over details of the proposed deal. If adopted, the tentative agreement will go to all Fiat Chrysler hourly and salary workers for a ratification vote that will begin on Dec. 6, according to the statement.

The pact is expected to share many of the same terms as the union's recent contracts with Ford Motor and General Motors. Those deals included 3% raises or 4% lump-sum bonuses each year of the contract, retention of roughly 3% out-of-pocket health-care costs and a path for temporary workers to become full-time employees.

"Out of respect for our members, we will refrain from commenting any further or releasing full details of the agreement until the UAW-FCA Council leaders meet and review the details," said Estrada in the statement.

GM also agreed to $11,000 ratification bonuses for most of its full-time employees. Ford agreed to $9,000 ratification bonuses, however previous contracts have included lower amounts for Fiat Chrysler workers.

The federal probe into corruption of the UAW, which started with Fiat Chrysler, has led to charges against 13 people, including seven convictions of people affiliated with the union and three Fiat Chrysler executives.



-- CNBC's Alex Sherman contributed to this report