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
Category: Troubleshooting Notes
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.
Why Mirror Swaps Cause Camera Issues on GM Vehicles — And Why Calibration Often Fails
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 — What Actually Causes It (and What Doesn’t)
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
Why a Blank Screen Doesn’t Always Mean a Failed 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.