B101D on Chevrolet: How to Diagnose & Fix
ECU Hardware (Control Module Internal Hardware Performance)
1 Chevrolet model · 1 documented issue · $150-$700 repair
B101D on Chevrolet by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Blue screen with 'Service Rear Vision System' when selecting Reverse
- Black screen with red triangle and crossed-out camera icon
- Camera works again after the car sits and the radio sleeps
- Condition can appear about 25 minutes after startup when idling
How to Fix
Diagnosis is DTC-driven and GM is emphatic that the Video Processing Module should usually NOT be replaced. On surround/trailer camera builds (UV2/UVI/UVS) with B101D symptom byte 3C or 39 in the VPM, or B395A 08/72/3A in the radio, reprogram the Video Processing Module (K157) - reflashing reduces the sensitivity of the B101D trip. On standard rear-view-camera builds (UVB), if the A11 radio has stored all three B395A symptom bytes 08, 72 AND 3A and the blue screen persists through a power cycle, replace the rearview camera. If all three bytes are not present the bulletin does not apply and the shop should keep diagnosing. Covered under the bumper-to-bumper warranty on cars still inside 3 years/36,000 miles.
Sources for this issue (1)
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 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 it is documented across 1 model: Bolt EUV.
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 Chevrolet?
Published repair estimates on Chevrolet range from $150 to $700 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.
Looking for B101D on a different make?
View B101D across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.