Honda U3000-49
by-step process in isolating the faulty component. In most situations, the SRS Unit should be last on the list of components to replace. Here is a quick tip for troubleshooting a f
Common search variants: U300049 · U3000 49 · U3000_49 · Search ignores case and common separators.
Quick answer
For a 2021 Honda Clarity (US), DTC U3000-49 is identified in the supplied Honda/NHTSA communication as “Internal Failure of the SRS Unit.” Honda states there can be several possible causes and that the SRS Unit should usually be the last component replaced after diagnostic isolation.
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 U3000-49 mean?
For a 2021 Honda Clarity (US), DTC U3000-49 is identified in the supplied Honda/NHTSA communication as “Internal Failure of the SRS Unit.” Honda states there can be several possible causes and that the SRS Unit should usually be the last component replaced after diagnostic isolation.
2. Technical explanation
The verified manufacturer communication says that, when the DTC can be duplicated, its troubleshooting process is intended to isolate the faulty component. It specifically notes a seat-weight-sensor diagnostic tip: after disconnecting all seat weight sensors and clearing DTCs, if U3000-49 does not return, replace the seat frame/rail. The communication also warns that a donor seat frame must have the same trim level; a different trim level may produce the same DTC condition and confuse diagnosis.
3. What system is affected?
Supplemental Restraint System (SRS), including the SRS Unit and seat weight sensor/seat frame-rail diagnostic path described in the Honda communication.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
Not yet established by verified evidence.
6. Possible causes
- Honda states that several possible causes may store SRS DTC U3000-49, but the supplied evidence does not list all causes.
- A faulty seat weight sensor is specifically addressed in Honda’s diagnostic tip.
- A seat frame/rail condition is indicated by Honda’s stated result when all seat weight sensors are disconnected, DTCs are cleared, and U3000-49 does not reappear.
- Using a seat frame from a vehicle with a different trim level may result in the same DTC condition, according to Honda.
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 Honda service provider using the applicable Honda troubleshooting process.
- Do not replace the SRS Unit first solely because U3000-49 is stored; Honda states it should be last on the list of components to replace in most situations.
- If a seat frame is used from another vehicle during diagnosis or repair, Honda says to use one from the same trim level.
10. Step-by-step troubleshooting
- If the DTC can be duplicated, follow the Honda step-by-step troubleshooting process to isolate the faulty component.
- Honda’s seat-weight-sensor tip is to disconnect all seat weight sensors and clear the DTCs.
- If U3000-49 does not reappear after that procedure, Honda directs replacement of the seat frame/rail.
- The supplied evidence does not establish further diagnostic steps.
11. When to contact service
Contact a Honda dealer or qualified SRS service provider for diagnosis. The supplied Honda communication describes a diagnostic process and cautions against replacing the SRS Unit early in the process.
12. What the service center may check
- Confirm whether U3000-49 can be duplicated.
- Perform the applicable Honda SRS troubleshooting process to isolate the faulty component.
- Evaluate the seat weight sensor path described in Honda’s communication.
- If the stated sensor-disconnection and DTC-clearing result occurs, replace the seat frame/rail.
- Confirm trim-level compatibility if using a known-good donor seat frame.
13. Possible repair or resolution
- Honda states that if all seat weight sensors are disconnected, DTCs are cleared, and U3000-49 does not reappear, replace the seat frame/rail.
- In most situations, Honda says the SRS Unit should be the last component considered for replacement.
- Further repair resolution is not yet established by verified evidence.
14. Affected vehicles
- Honda Clarity · 2021 · US
15. Related TSBs / service bulletins
- Honda/NHTSA Manufacturer Communication A21100B, NHTSA document MC-10206988-0001, published January 29, 2022: https://static.nhtsa.gov/odi/tsbs/2022/MC-10206988-0001.pdf
- Honda/NHTSA Manufacturer Communication A21100B, NHTSA document MC-10206395-0001, published January 4, 2022; this revision applies to 2020–2021 Clarity among listed Honda models: https://static.nhtsa.gov/odi/tsbs/2022/MC-10206395-0001.pdf
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified applicability: 2021 Honda Clarity, US. Official evidence supplied is Honda manufacturer communication A21100B published through NHTSA. No recall information is established by the supplied evidence.
19. Frequently asked questions
What does Honda U3000-49 mean?
The supplied Honda/NHTSA communication identifies U3000-49 as “Internal Failure of the SRS Unit.”
Should the SRS Unit be replaced immediately?
No. Honda states that in most situations the SRS Unit should be last on the list of components to replace after troubleshooting isolates the faulty component.
What does Honda say about seat weight sensors and U3000-49?
Honda advises disconnecting all seat weight sensors and clearing DTCs as a diagnostic tip. If U3000-49 does not reappear, Honda directs replacement of the seat frame/rail.
Can I use any donor seat frame?
No. Honda says that a known-good donor seat frame should be from a vehicle with the same trim level, because different trim levels may result in the same DTC condition.
Is it safe to drive or charge with U3000-49?
Not yet established by verified evidence.