B101D on GMC: How to Diagnose & Fix
ECU Hardware (Control Module Internal Hardware Performance)
1 GMC model · 1 documented issue · $100-$900 repair
B101D on GMC by model: symptoms, diagnosis and fix
The IntelliLink/MyLink touchscreen freezes and spontaneously reboots, losing control of radio, climate, navigation and Bluetooth, and often displays a black screen or a frozen backup-camera image. During a reboot, phone calls drop and the rear camera can go dark while in reverse - a visibility concern. Root causes include software glitches, outdated firmware, and occasionally loose display/camera wiring.
Common Symptoms
- Touchscreen freezes or reboots
- Black/blank infotainment screen
- Backup camera not working or shows frozen image
- Lost radio/Bluetooth/nav
- Dropped phone calls on reboot
How to Fix
Start with a software/firmware update at the dealer and a system reset (Home + Fast Forward held ~10s, or Return to Factory Settings). Persistent cases require reseating/repairing loose harness connectors or replacing the radio/display module or backup camera.
Sources for this issue (3)
B101D code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B101D mean on a GMC?
B101D stands for "ECU Hardware (Control Module Internal Hardware Performance)." General Motors body-code definition. When power-up is commanded, the control module runs an internal self-test that requires only battery voltage, ignition voltage and ground; that test runs even when supply voltage is outside the normal operating range. B101D sets when the module detects an internal hardware malfunction during that self-test — the failure is inside the ECU itself, not in an external sensor or actuator. The two-character symptom suffix (e.g. B101D-00, -31, -39, -3B, -F0) narrows which internal element failed. Because this code can be stored by any GM body module, the affected function depends on which module reported it (e.g. a Power Steering Control Module for a lane-keep/steering complaint, a Seat Module for a Safety Alert Seat complaint). On GMC it is documented across 1 model: Terrain.
What are the most common causes of B101D?
The most common causes of B101D are: Internal failure of the reporting control module (ECU hardware fault) — the module is normally replaced and programmed, Corrupt or incomplete software/calibration in the module after a failed SPS programming event, Severe under- or over-voltage events, jump-start spikes or a failing battery stressing module internals, Water intrusion or corrosion inside the module housing, Poor power/ground supply to the module causing repeated resets. The specific cause varies by vehicle.
How much does it cost to fix B101D on a GMC?
Published repair estimates on GMC range from $100 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.