Technical troubleshooting support for GM electronics, including communication issues, installation pitfalls, programming errors, module behavior anomalies, and root-cause diagnostics. Focused on real-world field experience and OEM-level system behavior to help identify and correct complex issues efficiently.
Your GM screen is black but the backup camera still comes up — so the HMI must be fine, right? Not necessarily. GM routes rear camera video through a dedicated bypass module so the camera keeps working when infotainment fails. Here’s why that exists, and what it means for your diagnosis.
A Cadillac emblem appearing on a Chevrolet, GMC, or Buick infotainment screen followed by a black screen is a complete CSM failure. It’s one of the few GM infotainment symptoms that points to a single module with confidence. Here’s how to confirm it and what to do next.
DTC B101E is a General Motors diagnostic trouble code in the “Electronic Control Unit Software” family. On its own it… Read more B101E & U0028 on an HMI: the “VIN Not Programmed” Fault
Swapped mirrors on a GM vehicle and now your cameras are cropped, guidelines are wrong, or an hourglass won’t clear? This tech note explains why calibration often fails after mirror swaps and why the real cause is a camera-processing configuration mismatch—not a defective camera or HMI.
Ghost touches, phantom inputs, and random screen behavior in GM vehicles are commonly misdiagnosed. This guide explains why the touchscreen digitizer and controller are almost always the real cause — not the HMI
A blank or frozen infotainment screen on GM vehicles is often misdiagnosed as HMI failure. This guide explains how the MOST bus ring works, why the Radio is the system master, and how failures in any node—amplifier, cluster, media player, or wiring—can take the system down.
