GU over reving when Cruise engaged.

I have a 2011 Automatic 3lt CRD GU Patrol. I can be tooling along at 100ks with the cruise control engaged, when ascending a slight rise in elevation the cruise will kick back in a lower gear to compensate, ( I'm assuming 3rd )....no problem. However the cruise will then decide its not enough and change back into what I believe is second gear....yes whilst still maintaining 100ks of pace.
The tacho hits redline and I disengage instantly to minimise stress to both the engine and my wallet.
Is this a module / electrical issue? Or is it turbo related?
Cheers boys.

sadly the cruise control on these are up to shit,,,they do travel a little better without overdrive on in hilly country.....i don't even bother using mine unless it's a near on flat road as it's to frustrating..cheers..

and welcome to the forum

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Originally Posted by Avo

sadly the cruise control on these are up to shit,,,they do travel a little better without overdrive on in hilly country.....i don't even bother using mine unless it's a near on flat road as it's to frustrating..cheers..

and welcome to the forum

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Must be an Auto thing ... it works fine in the manual

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Originally Posted by happygu

Must be an Auto thing ... it works fine in the manual

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yeah read about it on this froum..they shit hey...