2018 Sierra WT io4, io5???

[Knowles101]

I have a 2018 Sierra WT and I am trying to find out what version of the HMI I have....io4 io5??? Is there any way to figure it out without pulling out the unit?

[ford5of5]

Look at the sticker in your glove box. IIRC, the options are in alphabetical order. Look for IO3,4,5, or B

[tmo]

2018’s don’t have the RPO sticker in the glove box. There is a QR code on the driver side door pillar. Scan that with your iPhone or Android and it will bring up all your RPO “build” codes.