But that aid has only gone so far, leaving suppliers, particularly Tier 2 and Tier 3 companies that generally don't have the same level of profit margins or customer diversity as larger Tier 1 companies, in a fragile financial position.
"The cherry on top of the cake for suppliers has been inflation and not getting pricing from their customers to stay whole from a profitability perspective," said Michael Robinet, executive director of Automotive Advisory Services at S&P Global Mobility. "Suppliers have not been able to stretch their legs and make money to make up for all of their issues over the last four years."
Larger Tier 1 suppliers are closely monitoring the health of their subsuppliers as the UAW strike progresses, and particularly if the union expands the strike beyond the initial three plants it has targeted. Mahle CEO Arnd Franz told Automotive News at the Detroit auto show last week that the German parts supplier has been forced to do "a lot of firefighting" to help keep its Tier 2 suppliers afloat in recent months by assisting them when production disruptions occur or tools break.
"We're performing to protect our customers and their production," he said. "This is a big part of the cost increases that we have incurred, and in many cases were deteriorating our margins."
The financial wherewithal of the supply chain could be most tested after the strike ends and automakers look for production to come back online quickly. That's especially true if the strike persists for weeks or if it expands to include a large portion of any of the Detroit automakers' U.S. plants.
"The biggest concern I've universally heard from my supplier clients is the ability to come back online on short notice," Rustmann said. "It's going to be very difficult, especially the longer it goes on, and everyone is worried OEM customers are going to demand an overnight return to full production. It's not realistic."
Suppliers are likely to quickly burn through what little inventory they do have and, if they are forced to lay off or furlough workers during the strike, might find they don't have enough workers ready to come back at a moment's notice — or that their Tier 2 suppliers could be having the same issue.
"This is not a type of industry where you can go from zero to 100 overnight," said Laura You, a member of Michigan law firm Warner Norcross + Judd's automotive and supply chain industry groups. "If your customer orders have been stopped altogether for a period of several weeks, it will take time to ramp back up."
You and Rustmann have said suppliers should work with automakers to make it clear that they will need time to ramp up. Doing so is important, Rustmann said, because contracts between suppliers and their customers would typically allow automakers to levy financial penalties on suppliers if production doesn't accelerate at the speed they expect.
He added: "I counseled my clients on all types of ways to try to improve their contracts, but the reality is they're having great difficulty in obtaining any kind of concessions from their customers."