(Bloomberg) -- Volkswagen AG waited two months after acknowledging a software abnormality in its cars to tell regulators the algorithm was designed to cheat emissions tests, according to a staff memo prepared for lawmakers investigating the automaker.

The Energy and Commerce Committee, which will hold a hearing on Thursday in Washington, also wants further details on how and why the German-based automaker cheated on U.S. and California emissions tests, according to the memo. Committee staff met Monday with representatives of VW and regulators in preparation for the hearing.

The House hearing will add to the emerging record on what went on behind the scenes at VW. By the time the panel convenes, VW will have informed European regulators about steps it intends to take to fix nearly 11 million vehicles.

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