Grieving families: Why did it take GM so long to recall cars?

(CNN) – GM issued yet another recall Monday; 1.3 million vehicles are being recalled to fix a potential problem with power steering.

It comes just one day before top executives from GM – including new CEO Mary Barra – will appear before Congress to try and explain how and why the company failed to fix a safety defect that killed 13 people, and a congressional grilling is only the beginning for GM.

The company is facing a federal criminal investigation concerning the handling of a faulty ignition switch that would suddenly turn the car's power off, cutting off airbags, power steering and power brakes, sources tell CNN Money.

More than 2 million GM cars with the problem have now been recalled, but as CNN's Drew Griffin reports, GM won't tell anyone which deadly crashes involved the defect, not even the families of the victims.