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Mercedes-Benz U011500

As a consequence, on vehicles with BMS30EB02, the DTC for the auxiliary assembly fuse P0E2F00 can be set. This triggers the yellow HV drive system warning message. In the ignition

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Mercedes-Benz service facility for diagnosis under LI54.10-P-079533. Prompt service attention is appropriate when HV or 12 V warning messages are displayed.
Confidence95%

Quick answer

For verified U.S. 2022–2025 Mercedes-Benz EQB and G-Class applicability, U011500 is documented in Mercedes-Benz communication LI54.10-P-079533 as a possible DC/DC-converter-related stored DTC. The bulletin identifies incorrect DC/DC converter wake-up behavior as a possible cause and describes yellow HV drive system warnings; some versions also describe a red 12 V fault message. Driving and charging status are not yet established by verified evidence.

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 U011500 mean?

For verified U.S. 2022–2025 Mercedes-Benz EQB and G-Class applicability, U011500 is documented in Mercedes-Benz communication LI54.10-P-079533 as a possible DC/DC-converter-related stored DTC. The bulletin identifies incorrect DC/DC converter wake-up behavior as a possible cause and describes yellow HV drive system warnings; some versions also describe a red 12 V fault message. Driving and charging status are not yet established by verified evidence.

2. Technical explanation

The official Mercedes-Benz communication lists U011500 in a DC/DC converter fault-code group with P1D0B00 and P1CA000. It states that not all DTCs in a group are necessarily stored. The communication identifies incorrect wake-up behavior of the DC/DC converter as the cause, and states that DC/DC DTCs and warning messages may appear after a time delay. For vehicles with BMS30EB02, it further states that P0E2F00 for the auxiliary assembly fuse can be set, triggering a yellow HV drive system warning. In the ignition cycle in which a red 12 V fault message is displayed, the DC/DC converter does not support the 12 V electrical system.

3. What system is affected?

DC/DC converter and 12 V electrical-system support; the communication also references the HV drive system warning and, on vehicles with BMS30EB02, the auxiliary assembly fuse DTC P0E2F00.

4. How serious is this code?

The diagnostic record severity is unknown. The official communication documents yellow HV drive system warnings and may document a red 12 V fault message, but it does not establish a universal severity classification for U011500.

5. Symptoms you may notice

  • Yellow HV drive system warning message may be displayed.
  • A red 12 V fault message may be displayed in the instrument cluster.
  • DC/DC converter DTCs and warning messages may appear with a time delay.
  • If initial warning messages are ignored in the same ignition cycle, additional warnings, including red HV and yellow HV drive system warnings, may be shown.

6. Possible causes

  • The official communication identifies incorrect wake-up behavior of the DC/DC converter as a possible cause.
  • Other causes are 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

  • Do not ignore displayed warning messages.
  • Arrange assessment by an authorized Mercedes-Benz service facility, especially if a red 12 V fault message or HV warning is displayed.
  • Do not attempt high-voltage or DC/DC converter repairs yourself.

10. Step-by-step troubleshooting

  1. Have the vehicle evaluated using the applicable Mercedes-Benz procedure in LI54.10-P-079533.
  2. Confirm whether the DC/DC converter has stored U011500 together with P1D0B00 and/or P1CA000, or with the separate group P0C3B00, P0E9700, P0E5400, and P0C4000. The communication notes that not every DTC in a group will necessarily be present.
  3. Determine whether the vehicle has BMS30EB02 and whether P0E2F00 is stored, as described in the communication.

11. When to contact service

Contact an authorized Mercedes-Benz service facility for diagnosis under LI54.10-P-079533. Prompt service attention is appropriate when HV or 12 V warning messages are displayed.

12. What the service center may check

  • Read DC/DC converter fault memory for the two documented DTC groups.
  • Check whether warning messages occurred with a time delay after vehicle access or wake-up.
  • For BMS30EB02 vehicles, check for P0E2F00, which the communication associates with the auxiliary assembly fuse and yellow HV drive system warning.
  • Apply the manufacturer diagnostic and repair procedure in LI54.10-P-079533.

13. Possible repair or resolution

  • The supplied verified evidence establishes that Mercedes-Benz published LI54.10-P-079533 for this condition.
  • The specific repair or software-action details are not included in the supplied evidence and are not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mercedes-Benz LI54.10-P-079533, published through NHTSA Manufacturer Communications 11021800 (August 8, 2025), 11021970 (August 5, 2025), 11023154 (September 16, 2025), 11028815 (February 14, 2026), and 11029977 (March 11, 2026).
  • Verified U.S. applicability: 2022–2025 Mercedes-Benz EQB and G-Class.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA-hosted Mercedes-Benz Manufacturer Communication LI54.10-P-079533: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021800

19. Frequently asked questions

What does U011500 indicate in this Mercedes-Benz communication?

It is listed as a possible additional DC/DC converter stored DTC, or in some cases a DTC that may appear without the other listed DC/DC DTCs.

What warning can accompany this condition?

The communication documents a yellow HV drive system warning. It also describes a red 12 V fault message and, if initial warnings are ignored in the same ignition cycle, possible additional red HV and yellow HV drive system warnings.

Is P0E2F00 connected to this condition?

For vehicles with BMS30EB02, the communication states that P0E2F00 for the auxiliary assembly fuse can be set as a consequence, triggering the yellow HV drive system warning.

Can I continue driving or charging?

Driving and charging status are not yet established by verified evidence.

20. Sources & verification

Verified
Mercedes-Benz U011500: As a consequence, on vehicles with BMS30EB02,… | EV Diagnostics