EV Diagnostics
Verified EV diagnostic knowledge page

Mercedes-Benz P0E2F00

board electrical system. This means the 12 V battery may be discharged in the event of longer use. Cause In individual ignition cycles, this may result in fau

DriveNot yet established by verified evidence. The supplied evidence does state that, if the red 12 V fault message is displayed in an ignition cycle, the DC/DC converter does not support the 12 V system and the 12 V battery may discharge during longer use.
ChargeNot yet established by verified evidence. The official communication notes warning behavior when the high-voltage system is switched on, including charging or 12 V support, but does not establish whether charging is safe or should continue.
ServiceContact an authorized Mercedes-Benz service provider for diagnosis, particularly if P0E2F00 is present with a yellow HV drive-system warning or a red 12 V fault message.
Confidence95%

Quick answer

P0E2F00 is a Mercedes-Benz DTC associated in the supplied official communications with the auxiliary assembly fuse and a yellow high-voltage drive-system warning. On affected vehicles with BMS30EB02, an incorrect DC/DC-converter wake-up behavior may lead to this code. In an ignition cycle displaying a red 12 V fault message, the DC/DC converter does not support the 12 V electrical system, so the 12 V battery may discharge during longer use.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does P0E2F00 mean?

P0E2F00 is a Mercedes-Benz DTC associated in the supplied official communications with the auxiliary assembly fuse and a yellow high-voltage drive-system warning. On affected vehicles with BMS30EB02, an incorrect DC/DC-converter wake-up behavior may lead to this code. In an ignition cycle displaying a red 12 V fault message, the DC/DC converter does not support the 12 V electrical system, so the 12 V battery may discharge during longer use.

2. Technical explanation

The verified Mercedes-Benz/NHTSA communications describe P0E2F00 as a DTC for the auxiliary assembly fuse on vehicles with BMS30EB02. The documented cause is incorrect wake-up behavior of the DC/DC converter. The documents state that DC/DC-related DTCs and warning messages may appear with a time delay. When the high-voltage system is switched on, including for charging or 12 V support, the documented warning behavior may occur. In the ignition cycle where a red 12 V fault message is displayed, the DC/DC converter does not support the 12 V onboard electrical system; consequently, the 12 V battery may discharge with longer use.

3. What system is affected?

12 V onboard electrical system and DC/DC converter; the official communication also identifies an auxiliary assembly fuse DTC and a high-voltage drive-system warning.

4. How serious is this code?

The diagnostic record rates severity as unknown. However, verified communications state that the 12 V battery may discharge during longer use in an ignition cycle displaying the red 12 V fault message.

5. Symptoms you may notice

  • Yellow HV drive-system warning message may be triggered by P0E2F00.
  • A red 12 V fault message may be displayed in an affected ignition cycle.
  • DC/DC-related DTCs and warning messages may appear with a time delay.
  • A white HV warning message may be displayed when accessing the vehicle, according to the official communication.

6. Possible causes

  • For vehicles with BMS30EB02, the official communication identifies incorrect wake-up behavior of the DC/DC converter as the cause.
  • Other causes are not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. The supplied evidence does state that, if the red 12 V fault message is displayed in an ignition cycle, the DC/DC converter does not support the 12 V system and the 12 V battery may discharge during longer use.

8. Can I charge the vehicle?

Not yet established by verified evidence. The official communication notes warning behavior when the high-voltage system is switched on, including charging or 12 V support, but does not establish whether charging is safe or should continue.

9. What you can safely do

  • Avoid attempting repairs to high-voltage or DC/DC components.
  • If a red 12 V fault message is displayed, recognize that the 12 V battery may discharge during longer use.
  • Arrange diagnosis by an authorized Mercedes-Benz service provider.

10. Step-by-step troubleshooting

  1. Have a qualified Mercedes-Benz technician check whether the vehicle has BMS30EB02 and whether the documented DC/DC-converter fault-code groups are stored.
  2. The official communication identifies two relevant code groups: P0C3B00, P0E9700, P0E5400, P0C4000; and P1D0B00, P1CA000, U011500. Not all codes in a group must be present.
  3. Do not perform high-voltage diagnostic or repair work yourself.

11. When to contact service

Contact an authorized Mercedes-Benz service provider for diagnosis, particularly if P0E2F00 is present with a yellow HV drive-system warning or a red 12 V fault message.

12. What the service center may check

  • Confirm whether BMS30EB02 is fitted.
  • Read stored DC/DC-converter fault codes and assess the documented combinations.
  • Evaluate the reported DC/DC-converter wake-up behavior and related warning messages.
  • Assess the 12 V onboard electrical-system support condition in the affected ignition cycle.

13. Possible repair or resolution

  • The supplied verified evidence identifies the documented condition and diagnostic context, but does not establish a specific repair procedure or final repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mercedes-Benz LI54.10-P-079533, published through NHTSA manufacturer communications 11021800, 11021970, 11023154, 11028815, and 11029977. The supplied summaries associate P0E2F00 with BMS30EB02 and incorrect DC/DC-converter wake-up behavior.

16. Recall information

  • No recall information was supplied or established by the verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Mercedes-Benz manufacturer communications: LI54.10-P-079533. Supplied NHTSA communication IDs: 11021800, 11021970, 11023154, 11028815, and 11029977.

19. Frequently asked questions

What does P0E2F00 mean on an affected Mercedes-Benz EV?

The supplied official communication describes it as a DTC for the auxiliary assembly fuse. On vehicles with BMS30EB02, it can be set as a consequence of incorrect DC/DC-converter wake-up behavior.

What warning may P0E2F00 trigger?

The official communication states that P0E2F00 triggers a yellow HV drive-system warning message.

Why is a red 12 V fault message important?

In the ignition cycle in which the red 12 V fault message is displayed, the DC/DC converter does not support the 12 V onboard electrical system. The official communication states that the 12 V battery may discharge during longer use.

Does P0E2F00 always appear with every related DC/DC code?

No. The official communication states that not all DTCs from a documented fault-code group are necessarily triggered.

Which vehicles are covered by the supplied applicability data?

The supplied applicability data lists US-market 2022–2025 Mercedes-Benz EQB and G-Class vehicles. Whether a particular vehicle has the documented BMS30EB02 condition requires service confirmation.

20. Sources & verification

Verified
Mercedes-Benz P0E2F00: board electrical system. This means the 12 V… | EV Diagnostics