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Honda U357D

If all of these DTCs are NOT SET as current or history, this bulletin does not apply; continue with normal troubleshoo

DriveUnknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with U357D.
ChargeUnknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with U357D.
ServiceContact a Honda dealer or qualified EV service provider for diagnosis, particularly if the full DTC set in bulletin A25-043 is present.
Confidence95%

Quick answer

For a 2024–2025 Honda Prologue in the US, U357D is included in Honda service bulletin A25-043 only when it is set together with all of the bulletin’s listed DTCs, either current or history. If the complete listed set is not present, the bulletin does not apply and normal troubleshooting should continue.

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 U357D mean?

For a 2024–2025 Honda Prologue in the US, U357D is included in Honda service bulletin A25-043 only when it is set together with all of the bulletin’s listed DTCs, either current or history. If the complete listed set is not present, the bulletin does not apply and normal troubleshooting should continue.

2. Technical explanation

Verified evidence identifies U357D as one of the DTCs checked by Honda bulletin A25-043. The supplied bulletin evidence states that the vehicle must have ALL of these DTCs set: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF. The DTCs may be current or history. The supplied evidence does not establish a standalone component-level definition for U357D.

3. What system is affected?

Not yet established by verified evidence.

4. How serious is this code?

Unknown. The supplied verified evidence does not provide a severity classification.

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?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with U357D.

8. Can I charge the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with U357D.

9. What you can safely do

  • Have the DTC record checked to determine whether U357D and every other DTC listed in Honda bulletin A25-043 are set as current or history.
  • If the complete DTC set is not present, continue with normal troubleshooting as directed by the bulletin evidence.
  • Do not attempt high-voltage diagnosis or repair without appropriate qualified service support.

10. Step-by-step troubleshooting

  1. Verify whether all of the following DTCs are set as current or history: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF.
  2. If all listed DTCs are not set, Honda bulletin A25-043 does not apply; continue normal troubleshooting.
  3. Further diagnostic steps are not established by the supplied verified evidence.

11. When to contact service

Contact a Honda dealer or qualified EV service provider for diagnosis, particularly if the full DTC set in bulletin A25-043 is present.

12. What the service center may check

  • Check for current and history DTCs.
  • Confirm whether the complete A25-043 DTC set is present, including U357D.
  • If the complete set is absent, use normal troubleshooting rather than applying bulletin A25-043.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Honda bulletin A25-043, published May 23, 2025, applies to 2024–2025 Honda Prologue vehicles in the US according to the supplied applicability evidence.
  • The bulletin’s entry condition is that ALL of these DTCs are set as current or history: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF.
  • If the full DTC list is not set, the bulletin does not apply and normal troubleshooting should continue.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 11019250, Honda bulletin A25-043, published May 23, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11019250-0001.pdf

19. Frequently asked questions

What does U357D mean on a Honda Prologue?

The supplied verified evidence does not provide a standalone definition. It identifies U357D as one member of the DTC group evaluated under Honda bulletin A25-043.

Does Honda bulletin A25-043 apply if U357D is the only code present?

No. The bulletin evidence requires all listed DTCs to be set as current or history; U357D alone does not meet that stated condition.

Which DTCs must be present for bulletin A25-043?

P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E, and U35AF must all be set as current or history.

20. Sources & verification

Accepted ResearchVerified
Honda U357D: If all of these DTCs are NOT SET as current or history,… | EV Diagnostics