DETROIT (AP) — General Motors has suspended two engineers in the first disciplinary action stemming from its mishandled recall of more than 2 million small cars for a deadly ignition switch problem. But the company also said a second ignition part in the cars must be fixed, boosting first-quarter recall costs above $1 billion.

The suspensions, with pay, come from GM’s own investigation into the recall. CEO Mary Barra promised Congress last week that she’d take action when appropriate, as lawmakers alleged that at least one company engineer tried to cover up the switch problem.