GMC 2013 tyre pressure light

[John Harris]

I have recently rotated my tyres and reset the positions with the relearn tool. However I still have the tyre light on, on the dash and the warning messages in the DIC. I have set the pressures at around 50 psi.
Can anyone tell me how I can reset the default pressure in the truck to 50 psi without visiting a dealer as I am in Australia.
I have a 2013 GMC Sierra Denali 2500 HD.
Thanks John