The Blues (1-2) threw away a 43-point lead in their last-start loss to Melbourne and have not won a quarter after halftime in any of their three outings this season.
The horror form has brought more heat on fifth-year coach Voss after he was backed by the club last August to at least see out the final season of his contract in 2026.
Former Carlton great Brendan Fevola this week suggested Voss should quit his post if his team loses to North Melbourne in their marquee clash on Good Friday.
But Walsh insists the Blues' playing group is taking ownership of their performances and threw his support behind Voss.
"We're all right in behind Vossy. The biggest thing with our whole mindset this year is we're all in it together," Walsh said.
"I know the outside will try to make it about one or two people, but a coach is part of a coaching group that then help the players, and the players are there to execute.
"We need to put our hands up as players and we just need to execute for longer."
Walsh dismissed queries over Carlton's fitness, instead blaming their mentality for their second-half struggles.
"We haven't created habits that last over four quarters and there's no point sooking about it - it's about getting to work on it now," Walsh said.
"I don't think there's an element of 'here we go again' but the biggest thing for us is we've been striving to play four quarters and we just haven't done that.
"Then there's times where you can nearly want it so bad that you're forcing the game rather than playing your role.
"It does become a bit clouded when you're not thinking as clear."
Walsh said it the onus is on Carlton's on-field leaders to steer the team out of its second-half rut.
"In the moment, heat of the game, where's our mind at to be able to take it on?" Walsh said.
"Vossy mentioned it after the (Melbourne) game - how are your leaders embodying that and how are we directing the players around us?
"From there you get everyone on the same page. It won't take much to turn it around if that's the case."
Carlton have a strong record against North in their Good Friday clashes, winning the previous three by an average margin of 63 points.
But the Kangaroos were surprise 11-point winners last time they met, in June last year.
