Guardiola was sent off at half-time in the quarter-final second leg at Etihad Stadium on 10 April for complaining about a decision.
He will one match next season, with a second game deferred for a year.
Liverpool were fined 30,000 euros (£25,450) over crowd incidents during the quarter-finals and semi-finals.
Former Barcelona boss Guardiola said he “did not insult” referee Mateu Lahoz when protesting that a disallowed goal shortly before half-time should have stood.
City were leading 1-0 – but trailing 3-1 on aggregate – when Leroy Sane was adjudged offside despite firing in after the ball deflected into his path off Liverpool midfielder James Milner’s knee.
Liverpool won the match 2-1 to seal a 5-1 aggregate victory. They lost the final 3-1 to Real Madrid.
Guardiola will miss City’s first game of the Champions League next season, although a second match will only be added if he receives disciplinary action for a further offence next season.
European football’s governing body fined Liverpool 20,000 euros (£17,500) for crowd disturbances, acts of damage, the throwing of objects and setting off of fireworks during the first leg against City at Anfield on 4 April.
Reds supporters attacked City’s team bus on its way to the stadium, prompting a police investigation.
They were also fined 6,000 euros (£5,200) for fans setting off fireworks and throwing objects during the second leg and a further 3,000 euros (£2,600) for use of fireworks during the semi-final second leg at Roma.