Tiptronic kickdown problem

I am having some problems with the automatic gearbox on my Peugeot 2008. When overtaking the kickdown works ok, but the tiptronic gearbox does not change up again and I have to change up manually. The dealer claims it is a tyre wear problem, is this correct?

Asked on 18 March 2014 by Itsmeagain

Answered by Honest John
It might be due to tyre wear. Or a sticking valve in the servo valve box.
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