B101D on GMC
ECU Hardware (Control Module Internal Hardware Performance)
B101D on GMC vehicles indicates ecu hardware (control module internal hardware performance). Au7o has documented this code across 1 GMC model — most commonly on Terrain. 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). Typical repair costs on GMC range from $100 to $900, depending on the specific model and root cause.
Common Causes of B101D
- •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
B101D on GMC by Model
GMC Terrain(1 issue)
- IntelliLink Infotainment Freezing/Rebooting and Backup Camera Black Screen2013-2019
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 Root causes include software glitches, outdated firmware, and occasionally loose display/camera wiring.
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View B101D across all makes →Frequently Asked Questions
What does B101D mean on 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 specifically, this code is documented across 1 model.
What causes B101D on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B101D on a GMC?▼
Repair costs on GMC range from $100 to $900, depending on the specific model and root cause.
Which GMC models have B101D documented?▼
Au7o has documented B101D on 1 GMC model: Terrain.