Honda U357B
If all of these DTCs are NOT SET as current or history, this bulletin does not apply; continue with norm
Quick answer
For U357B on a 2024–2025 Honda Prologue (US), Honda bulletin A25-043 applies only when U357B and all listed companion DTCs are set as current or history. If they are not all present, the bulletin instructs technicians to continue with normal diagnosis.
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 U357B mean?
For U357B on a 2024–2025 Honda Prologue (US), Honda bulletin A25-043 applies only when U357B and all listed companion DTCs are set as current or history. If they are not all present, the bulletin instructs technicians to continue with normal diagnosis.
2. Technical explanation
Verified evidence identifies U357B in Honda bulletin A25-043 as one member of a required DTC group. The bulletin’s applicability condition is that the vehicle has all of these DTCs set as current or history: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF. The provided evidence does not establish a standalone component-level definition for U357B.
3. What system is affected?
Not yet established by verified evidence.
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
- 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
- Have the DTC status checked to determine whether U357B and every required companion code are current or stored in history.
- Do not assume bulletin A25-043 applies based on U357B alone.
10. Step-by-step troubleshooting
- Confirm whether all required DTCs are set as current or history: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF.
- If all listed DTCs are not set as current or history, follow normal diagnosis, as directed by Honda bulletin A25-043.
11. When to contact service
Contact a Honda dealer or qualified service facility if the full required DTC group is present, or if diagnosis is needed. The provided evidence does not establish urgency, drivability, or charging guidance.
12. What the service center may check
- Verify the presence and current/history status of P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF.
- Determine whether the bulletin’s required all-codes condition is met before applying bulletin A25-043.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Honda Prologue · 2024–2025 · US
15. Related TSBs / service bulletins
- Honda bulletin A25-043, published May 23, 2025, is documented by NHTSA Manufacturer Communication PDF 11019250. It applies only when all specified DTCs, including U357B, are set as current or history.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
NHTSA Manufacturer Communication PDF 11019250: Honda A25-043, published May 23, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11019250-0001.pdf
19. Frequently asked questions
Does Honda bulletin A25-043 apply when only U357B is present?
No. The verified bulletin condition requires all listed DTCs, including U357B, to be set as current or history.
Which vehicles are covered by the supplied evidence?
2024–2025 Honda Prologue vehicles in the United States.
Can the vehicle be driven or charged with U357B?
Not yet established by verified evidence.