Have you ever wondered what all those 3-letter RPO codes are that are listed on your vehicle's build sheet? Take a moment to educate yourself on the latest & greatest RPO codes pertaining to the 2018+ GM infotainment system.

IOR Audio system, 7" diagonal GMC Infotainment System, includes multi-touch display, AM/FM stereo, includes Bluetooth streaming audio for music and most phones; featuring Android Auto and Apple CarPlay capability for compatible phones

IOS Audio system, 8" diagonal GMC Infotainment System, includes multi-touch display, AM/FM/SiriusXM stereo, Bluetooth streaming audio for music and most phones, Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings

IOU Audio system, 8" diagonal GMC Infotainment System with Navigation, includes multi-touch display, AM/FM/SiriusXM stereo, Bluetooth streaming audio for music and most phones, Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings

1 - Included and only available with (Y29) Infotainment Package I.
2 - Included and only available with (Y3I) Infotainment Package II.

IOT Audio system, 8" diagonal GMC Infotainment System with Navigation, includes multi-touch display, AM/FM/SiriusXM stereo, Bluetooth streaming audio for music and most phones, Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings. Includes greater memory.

U2L Radio, HD
1 - Included and only available with (Y3I) Infotainment Package II

UZ6 Audio system feature, 6-speaker system

UQA Bose Sound System premium 7-speaker system with amplifier in center console
1 - Included and only available with (Y3I) Infotainment Package II.

UST USB data ports, 2, one type-A and one type-C, includes auxiliary input jack, located in front center storage bin

MCZ USB data ports, 2, type-A, located within the center console
1 - Included and only available with (Y29) Infotainment Package I.

USS USB charging-only ports, 2, located on the rear of the center console

MCR SD Card Reader, located within front center storage bin
1 - Included and only available with (Y29) Infotainment Package I.

U2J XM Satellite Radio, delete

U2K SiriusXM Satellite Radio is standard on nearly all 2018 GM models. Enjoy a 3-month All Access trial subscription with over 150 channels including commercial-free music, plus sports, news and entertainment. Plus listening on the app and online is included, so you'll hear the best SiriusXM has to offer, anywhere life takes you. Welcome to the world of SiriusXM.
1 - Included and only available with (Y29) Infotainment Package I. If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. To cancel you must call us at 1-866-635-2349. See our Customer Agreement for complete terms at www.siriusxm.com. All fees and programming subject to change.
2 - If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. To cancel you must call us at 1-866-635-2349. See our Customer Agreement for complete terms at www.siriusxm.com. All fees and programming subject to change.