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Mercedes-Benz P1CA000

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 provider for diagnosis, particularly if an HV, 12 V, or HV drive system warning message is displayed.
Confidence95%

Quick answer

For verified-applicable Mercedes-Benz EQB and G-Class vehicles (2022–2025, US), P1CA000 is documented in a Mercedes-Benz technical service bulletin as a possible DC/DC-converter-related fault code. The bulletin describes incorrect DC/DC converter wake-up behavior and states that a yellow HV drive system warning may occur; on vehicles with BMS30EB02, P0E2F00 may also be set.

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 P1CA000 mean?

For verified-applicable Mercedes-Benz EQB and G-Class vehicles (2022–2025, US), P1CA000 is documented in a Mercedes-Benz technical service bulletin as a possible DC/DC-converter-related fault code. The bulletin describes incorrect DC/DC converter wake-up behavior and states that a yellow HV drive system warning may occur; on vehicles with BMS30EB02, P0E2F00 may also be set.

2. Technical explanation

Mercedes-Benz bulletin LI54.10-P-079533 identifies P1CA000 as one of a group of DTCs that may be stored by the DC/DC converter. The bulletin says not all DTCs in the listed groups are necessarily triggered. It attributes the condition to possible incorrect wake-up behavior of the DC/DC converter, and notes that DC/DC DTCs and warning messages may appear after a time delay. The supplied evidence does not establish a standalone component-level definition for P1CA000 beyond this bulletin context.

3. What system is affected?

DC/DC converter and associated 12 V/HV warning-message behavior. The bulletin also references the auxiliary assembly fuse DTC P0E2F00 on vehicles with BMS30EB02.

4. How serious is this code?

Not yet established by verified evidence. The bulletin does document possible yellow HV drive system warnings and, if initial warnings are ignored during the same ignition cycle, possible additional warnings including a red HV warning message.

5. Symptoms you may notice

  • P1CA000 may be stored by the DC/DC converter.
  • A yellow HV drive system warning message may be displayed.
  • The bulletin describes possible delayed appearance of DC/DC DTCs and warning messages.
  • A red 12 V fault message is referenced in the bulletin context.
  • If initial warning messages are ignored in the same ignition cycle, additional messages, including red HV and yellow HV drive system warnings, may be shown.
  • On vehicles with BMS30EB02, P0E2F00 may be set and can trigger the yellow HV drive system warning message.

6. Possible causes

  • Mercedes-Benz identifies possible incorrect wake-up behavior of the DC/DC converter as the cause described in LI54.10-P-079533.
  • No other cause is established by the supplied 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 warning messages shown during the same ignition cycle; the bulletin states that additional warnings may be displayed if initial messages are ignored.
  • Arrange diagnosis by an authorized Mercedes-Benz service provider.
  • Do not attempt high-voltage or DC/DC converter repair yourself.

10. Step-by-step troubleshooting

  1. Have a qualified Mercedes-Benz technician retrieve stored DTCs from the DC/DC converter.
  2. Check whether the stored-code pattern includes P0C3B00, P0E9700, P0E5400, P0C4000, P1D0B00, P1CA000, or U011500, as described by the bulletin.
  3. For a vehicle equipped with BMS30EB02, check whether P0E2F00 is also present.
  4. Evaluate the condition using Mercedes-Benz bulletin LI54.10-P-079533.

11. When to contact service

Contact an authorized Mercedes-Benz service provider for diagnosis, particularly if an HV, 12 V, or HV drive system warning message is displayed.

12. What the service center may check

  • Retrieve DC/DC converter fault memory.
  • Assess the documented two-group DTC pattern: P0C3B00/P0E9700/P0E5400/P0C4000 and P1D0B00/P1CA000/U011500.
  • Confirm whether all, some, or none of the other listed DTCs are present; the bulletin states that not all DTCs are necessarily triggered.
  • Determine whether BMS30EB02 is installed and whether P0E2F00 is stored.
  • Review warning-message timing and ignition-cycle behavior in accordance with LI54.10-P-079533.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied bulletin excerpts identify the condition and diagnosis context but do not provide a verified repair procedure or resolution.

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).
  • The bulletin documents P1CA000 in a DC/DC-converter DTC group and describes possible incorrect DC/DC converter wake-up behavior.

16. Recall information

  • Not yet established by 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 P1CA000 mean on the verified Mercedes-Benz applications?

The verified bulletin lists P1CA000 as a fault code that may be stored by the DC/DC converter, in connection with a condition Mercedes-Benz attributes to possible incorrect DC/DC converter wake-up behavior. A standalone definition beyond that context is not established by the supplied evidence.

Can P1CA000 occur without every other listed code?

Yes. The bulletin states that, in some cases, not all DTCs in a listed fault-code group are triggered.

Can P1CA000 be associated with a yellow HV drive system warning?

Yes. The bulletin documents P1CA000 in the relevant DC/DC fault-code group and states that, on vehicles with BMS30EB02, P0E2F00 can be set as a consequence, triggering the yellow HV drive system warning message.

Is it safe to continue driving or charging?

Not yet established by verified evidence. The supplied bulletin does not provide a driveability or charging authorization.

Which vehicles are verified as applicable?

The supplied applicability evidence identifies US-market 2022–2025 Mercedes-Benz EQB and G-Class vehicles.

20. Sources & verification

Verified
Mercedes-Benz P1CA000: As a consequence, on vehicles with BMS30EB02,… | EV Diagnostics