The charge relates to an incident in March 2003 when Mr Huhne’s car was allegedly caught by a speed camera on the motorway between Stansted Airport in Essex and London.
It is alleged that between 12 March and 21 May 2003, Ms Pryce, 60, from Clapham in south London, falsely informed police that she was the driver of the car so Mr Huhne could avoid prosecution.
His change of plea came as his trial was due to begin at Southwark Crown Court.
BBC chief political correspondent Norman Smith said: “We can safely say that his political career is over.”
Guilty. Told you he was a lying scumbag.
Judge “He should be under no illusions about the prospect of his sentence”.