The "Heroes" actor entered the plea through his attorney and did not attend a court hearing on Wednesday. His case is scheduled for a pretrial hearing on March 15.
Pasdar was arrested Jan. 27 after authorities say they spotted the 44-year-old swerving and speeding on a Los Angeles freeway.
Pasdar plays Nathan Petrelli on the NBC show "Heroes." He is married to Dixie Chicks singer Natalie Maines.
A phone message left for Pasdar's attorney, Michael Nasatir, was not immediately returned Wednesday.
