GMC B0126-49
Sürücü izleme sistemi modülünde (DMSM) dahili/performans tipi arıza; 'Service Driver Assist' mesajı ile ilişkilidir.
Common search variants: B012649 · B0126 49 · B0126_49 · Search ignores case and common separators.
Quick answer
B0126-49 is documented for the 2022–2024 GMC Hummer EV Pickup and SUV as an internal/performance-type fault in the Driver Monitoring System Module (DMSM), associated with a “Service Driver Assist” message.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does B0126-49 mean?
B0126-49 is documented for the 2022–2024 GMC Hummer EV Pickup and SUV as an internal/performance-type fault in the Driver Monitoring System Module (DMSM), associated with a “Service Driver Assist” message.
2. Technical explanation
Verified evidence identifies B0126-49 as a DTC for an internal/performance-type fault of the Driver Monitoring System Module (DMSM). The supplied OEM/NHTSA technical-bulletin evidence associates this code with the “Service Driver Assist” message. The evidence provided does not establish the specific failed component, root cause, diagnostic procedure, or repair.
3. What system is affected?
Driver Monitoring System Module (DMSM) / driver-assistance system.
4. How serious is this code?
Unknown. Severity is not established by the verified evidence.
5. Symptoms you may notice
- “Service Driver Assist” message.
- B0126-49 diagnostic trouble code stored.
6. Possible causes
- An internal/performance-type DMSM fault is established by the diagnostic meaning.
- The underlying root cause is not yet established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis by a qualified GMC service facility.
- Record the warning message and diagnostic code if they are available.
- Do not attempt high-voltage or module repair procedures based on this information.
10. Step-by-step troubleshooting
- Verified evidence confirms the DMSM-related code and associated message only. A step-by-step troubleshooting procedure is not yet established by verified evidence.
11. When to contact service
Service need is not explicitly established by the supplied evidence; however, qualified GMC diagnosis is appropriate because the code concerns the driver-monitoring/driver-assistance system.
12. What the service center may check
- Confirm B0126-49 is present in the vehicle diagnostic system.
- Assess the Driver Monitoring System Module (DMSM) and driver-assistance system using applicable GMC service information. Further specific checks are not yet established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- GMC Hummer EV · 2022–2024 · GLOBAL
15. Related TSBs / service bulletins
- NHTSA / OEM manufacturer communication: GMC Hummer EV diagnostic evidence, source locator: Hummer EV | HUMMER EV Pickup / SUV | B0126-49. The supplied evidence documents the code meaning and its association with the “Service Driver Assist” message; it does not provide a verified repair resolution in the supplied record.
16. Recall information
- No recall information was supplied or established by the verified evidence.
17. Official manufacturer information
Source: NHTSA / OEM manufacturer communication, “GMC Hummer EV diagnostic evidence”: https://static.nhtsa.gov/odi/tsbs/2024/MC-11006296-0001.pdf
- NHTSA / OEM manufacturer communication: GMC Hummer EV diagnostic evidence · technical_bulletin
19. Frequently asked questions
What does GMC Hummer EV code B0126-49 mean?
It denotes an internal/performance-type fault in the Driver Monitoring System Module (DMSM), according to the supplied verified OEM/NHTSA evidence.
What warning may appear with B0126-49?
The verified evidence associates B0126-49 with a “Service Driver Assist” message.
Which vehicles are covered by the supplied evidence?
GMC Hummer EV Pickup and SUV models from model years 2022 through 2024, global applicability.
Is it safe to drive or charge with B0126-49?
Not yet established by verified evidence.
What repair fixes B0126-49?
Not yet established by verified evidence.