B101D on Chevrolet
ECU Hardware (Control Module Internal Hardware Performance)
B101D on Chevrolet vehicles indicates ecu hardware (control module internal hardware performance). Au7o has documented this code across 1 Chevrolet model — most commonly on Bolt EUV. 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 Chevrolet range from $150 to $700, 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 Chevrolet by Model
Chevrolet Bolt EUV(1 issue)
- Rear vision camera blue or black screen with 'Service Rear Vision System' message when shifting into Reverse2022
GM TSB 19-NA-076, revised February 2023, lists the 2022 Chevrolet Bolt EUV among the affected vehicles. On shifting into Reverse the center display shows either a blue screen with a 'Service Rear Vision System' message or a black screen with a red triangle and a crossed-out camera icon, with no rearward image at all. The condition can persist for an entire power cycle and typically clears only after the A11 radio enters and exits a sleep cycle. GM attributes it to software anomalies in the Video Processing Module or the rear camera, not to a wiring failure. Because FMVSS 111 requires a rearview image, a car that intermittently shows no reverse camera is a real safety defect and not just an annoyance. On EUVs equipped with the standard rear view camera (RPO UVB) the radio stores history DTC B395A with symptom bytes 08, 72 and 3A.
Looking for B101D on a different make?
View B101D across all makes →Frequently Asked Questions
What does B101D mean on Chevrolet?▼
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 Chevrolet specifically, this code is documented across 1 model.
What causes B101D on Chevrolet vehicles?▼
Common causes on Chevrolet: 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 Chevrolet?▼
Repair costs on Chevrolet range from $150 to $700, depending on the specific model and root cause.
Which Chevrolet models have B101D documented?▼
Au7o has documented B101D on 1 Chevrolet model: Bolt EUV.