GM Truck and SUV Platform Lineage (GM Full-Size Truck and SUV Platform Lineage (GMT900, K2/K2XX, T1/T1XX, Alpha))

Vehicle Platforms

Reference timeline of GM's full-size truck/SUV vehicle platforms — GMT900, K2/K2XX, T1/T1XX — and the Alpha compact RWD platform. Critical for module compatibility.

GM has used a sequence of body-on-frame full-size vehicle platforms over the past two decades, each with its own electrical architecture, module compatibility, and retrofit options.

GMT900 (2007–2014 trucks, 2007–2014 SUVs)

The predecessor to K2XX. Used on Silverado, Sierra (light-duty and HD), Tahoe, Suburban, Yukon, Yukon XL, and Escalade. Older Global A electrical architecture. Most GMT900 vehicles do not have HMI infotainment — they use legacy radio head units.

K2 / K2XX (2014–2019 light-duty trucks, 2015–2020 SUVs)

The successor to GMT900. The “K2XX” assembly code refers to the platform family. Used on:

  • Silverado 1500 light-duty: 2014–2018 (with some 2019 overlap to T1)
  • Sierra 1500 light-duty: 2014–2018 (with some 2019 overlap to T1)
  • Silverado/Sierra HD: 2015–2019
  • Tahoe, Suburban, Yukon, Yukon XL, Escalade, Escalade ESV: 2015–2020

K2XX trucks and SUVs use Global A electrical architecture, HMI-based infotainment (IO4/IO5/IO6), and the MOST bus. This is the platform where most WAMS retrofit work happens — HMI replacements, IO5→IO6 navigation retrofits, CarPlay/Android Auto upgrades, digital cluster swaps (UDD→UDV), and BCM custom programming.

T1 / T1XX (2019+ light-duty trucks, 2021+ SUVs)

The successor to K2XX. The “T1” assembly code identifies the platform. Used on:

  • Silverado 1500 light-duty: 2019+ (pre-refresh on Global A; 2022.5+ refresh on Global B)
  • Sierra 1500 light-duty: 2019+ (pre-refresh on Global A; 2022.5+ refresh on Global B)
  • Tahoe, Suburban, Yukon, Yukon XL, Escalade, Escalade ESV: 2021+

Pre-refresh T1 trucks (2019–2022 model year) are on Global A with CSM-based infotainment. The 2022.5+ refresh moves to Global B architecture. T1 SUVs (2021+) are on Global B from launch. WAMS performs cluster upgrades (UDD→UDV), CarPlay/Android Auto retrofits, and BCM programming on T1 vehicles.

Alpha (Cadillac compact RWD)

GM’s compact rear-wheel-drive platform — not a truck/SUV platform but worth noting for cluster compatibility and module work. Used on Cadillac ATS, CTS (3rd gen), CT4, CT5, and the 6th-gen Chevrolet Camaro. Spans both Global A (older Alpha) and Global B (Cadillac CT4/CT5).

C7 and C8 (Corvette)

Outside the truck/SUV platforms but worth mentioning. C7 Corvette (2014–2019) uses HMI-based infotainment on Global A. C8 Corvette (2020+) uses CSM-based infotainment on Global B. WAMS performs CarPlay/Android Auto retrofits on C7 and various module work on both generations.

Why platform matters for module work:

The platform determines which electrical architecture is in use, which means which modules are compatible, which programming tools are required, and which retrofit paths are possible. An HMI from a K2XX truck will not work in a T1 truck. A T1 SUV cluster will not work in a K2XX SUV. Always identify the platform before ordering parts.

Vehicle Applicability

All GM full-size body-on-frame trucks and SUVs from 2007 onward, plus selected Cadillac and Chevrolet RWD vehicles on the Alpha platform.

Also known as: K2, K2XX, T1, T1XX, GMT900, Alpha, GM Truck Platform, GM SUV Platform

Related Terms

  • BCM — The central body-electronics computer in a GM vehicle. Owns lights, locks, windows, anti-theft authority, and the VIN authority other modules authenticate against.
  • CSM — GM's unified next-generation infotainment computer that replaced the HMI starting on select GM platforms in mid-2017.5.
  • Global A — GM's first-generation modular electrical architecture, predominant on vehicles built from approximately 2010 through 2020.
  • Global B — GM's second-generation electrical architecture, introduced 2020. Supports OTA updates, CAN-FD networking, and a centralized security gateway.
  • HMI — The primary infotainment computer in most 2013–2020 GM vehicles with MyLink, IntelliLink, or first-generation CUE.
  • IO5 — The GM RPO code for the non-navigation HMI 2.0/2.5 infotainment configuration found on most 2014–2019 GM vehicles.
  • IO6 — The GM RPO code for the HMI infotainment configuration with embedded factory navigation, found on premium-trim 2014–2019 GM vehicles.
  • UDV — The GM RPO code for the 12.3-inch full digital instrument cluster found on premium Cadillac and select Chevrolet/GMC trims.

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