Firstly before you read any further, i dont totaly understand how the TC works on the VY but know its pretty advanced.
The first thing that came to my mind was that some TC systems work by switching off the fuel injecters killing the fuel delivery and /or retarding timming therefore stopping wheel spin. Your LPG system most likely does not have this facility.
Id say, if TC ok on petrol and Disabled on gas that that is most likely the reason.
If is disabled on both fuels id be really worried.
Read this thread about TC not working.
Bear in mind that LPG systems tap into the oxygen sensors, TPS and some systems also into the CAI.
If its just off on gas and all ok on petrol its just the way the conversion works.
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