GM doesn't have to. Obambi already guaranteed that the government (taxpayers) will cover the warranties!
Obama Offers Incentives to Stimulate Auto Sales
U.S. will guarantee GM, Chrysler warranties, Obama says
Obama also said the government will guarantee warranties on any GM or Chrysler vehicles. 3-30-2009
A MAN IS ONLY AS GOOD AS HIS WORD.
“Let me say this as plainly as I can. If you buy a car from Chrysler or General Motors, you will be able to get your car serviced and repaired just like always,” Obama said in a speech. “Your warranty will be safe. In fact, it will be safer than it has ever been. Because starting today, the United States will stand behind your warranty.”
President Barack Obama