Guardiola was dismissed from the touchline after remonstrating with official Antonio Mateu Lahoz over Leroy Sane's disallowed goal in the first half of the Etihad Stadium encounter.
His suspension includes a second match which has been deferred during a season-long probationary period.
Liverpool, meanwhile, have been fined a combined €29,000 for supporter indiscretions in the quarter-finals and semi-finals, including "acts of damage" and setting off fireworks.
That damage includes that on the Manchester City bus, which needed to be replaced after it was hit with a series of missiles as it arrived at Anfield for the first leg of the Champions League quarter-final.
Russian club Zenit will pay a €50,000 fine and be forced to play its next UEFA home match behind closed doors for the "racist behaviour" of fans in the Europa League last-16 clash with RB Leipzig, on top of a separate €20,000 fine.