Mary Barra, new CEO of US carmaker General Motors GM arrives for a news conference at the headquarters of the company's German subsidiary Opel in Ruesselsheim, on January 27, 2014.  - 

General Motors CEO Mary Barra has been getting a lot of heat from Congress for the troubles at GM. In a blog post yesterday, Barra promised "accountability" from senior leadership when it comes to dealing with future safety problems at the company.

We ask: just who is accountable? Marketplace regular Alan Sloan, senior editor-at-large at Fortune magazine has been watching Barra, who's only been in the job since January 15th,  try to weather the storm which originated years ago. Sloan says Congress is villanizing the wrong person.

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Follow David Brancaccio at @DavidBrancaccio