New MacBook Pro wrong Temperature

Hello everyone.
I have one of the new 15" MacBook Pro, and I recently noticed a wrong temperature reading on the GPU diode.
When everything is above 30ºC, the GPU diode is 1ºC or 3ºC, and sometimes I get -128ºC and this is impossible.
I have tried to read the temperatures with iStat Pro and Temperature Monitor using last versions.
Obviousely something is wrong. Or the two applications I am using have same bugs (and the same bug), or I have something wrong with my GPU diode sensor.
I would like some feedback on this. What application Apple recommends to check the temperatures, or should I go to a local Apple store and ask to check if this is an hardware problem?
Below is a screenshot from the application readings.
Thank you very much.
Best regards,
André Quintino.

I believe that is because the GPU is not the active GPU. When that is the case, it does not provide good temp readings. That is how my 2010 MBP acts also. There is nothing wrong.

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