In October 2025, GM CEO Mary Barra confirmed what had only been rumored: Apple CarPlay and Android Auto will be… Read more GM’s End of CarPlay and Android Auto: What It Means by Model Year
Category: GM Architecture
Engineering insights into GM Global A and Global B electrical architectures, including network behavior, module interaction, CAN/CAN-FD communication, and platform-specific design differences. Covers foundational concepts that determine retrofit compatibility, programming behavior, and system-level operation across modern GM vehicles.
Why GM Dealerships Usually Cannot Program Retrofit or Swap Features
Many GM owners are told to “just have the dealer program it” after a retrofit or swap. In reality, dealership programming is tightly restricted to a vehicle’s original build configuration. This Tech Note explains why most retrofits fall outside dealer capabilities — and the rare exceptions where limited changes are allowed.
Why an HMI 2.5 to HMI 3.x Upgrade Was Never Feasible on Most GM Vehicles
Many GM owners have asked why an “HMI 3.x upgrade” was never offered for HMI 1.1–2.5 vehicles. This article explains, in OEM-level detail, why such an upgrade was never technically viable for most platforms—and why WAMS refuses to sell solutions that only partially work.
Why Universal Aftermarket Digital Clusters Fall Short in Modern GM Vehicles
Universal aftermarket digital clusters often look impressive, but most don’t integrate correctly with modern GM electrical architecture. This tech note explains why GM clusters are control modules (not just screens), why Global A/Global B and CAN/CAN-FD differences matter, and why many “one-size-fits-all” clusters cause incorrect gauges, missing warnings, and unreliable vehicle behavior.
Can I Install a Full Digital “Refresh” Cluster in My 2019–2022.1 Silverado or Sierra? (The Truth)
Many 2019–2022 Silverado and Sierra owners ask if the full digital refresh cluster can be retrofitted. Here’s why it can’t — and what the correct OEM upgrade actually is.
How to Add Steering Wheel Audio Controls to 2019+ Silverado & Sierra Trucks
Many owners of 2019+ Chevrolet Silverado and GMC Sierra trucks discover that steering wheel audio controls are missing, partially functional, or stop… Read more How to Add Steering Wheel Audio Controls to 2019+ Silverado & Sierra Trucks
How to Tell If Your Silverado or Sierra Is a Refresh Model (2022.5+)—Even If It Looks Like the Old Interior
Overview GM’s mid-year 2022 split for the Silverado and Sierra 1500 created one of the most confusing identification issues in… Read more How to Tell If Your Silverado or Sierra Is a Refresh Model (2022.5+)—Even If It Looks Like the Old Interior