NHTSA ID Number: 11023154
Manufacturer Communication Number: LI54.10-P-079533
TSB/Document Date: 2025-09-17
Summary
Complaint 243: Red 12V battery message, white HV warning message, warning message in the IC and if applicable for vehicles with BMS30EB02 yellow HV drive system 465: Red 12V battery message, white HV warning message, warning message in the IC If the initial warning messages are ignored in the same ignition cycle, additional warning messages, e.g. red HV warning message and yellow HV drive system warning message may be shown. The DC/DC converter has stored a combination of the following two fault code groups: 1. P0C3B00, P0E9700, P0E5400, P0C4000. 2. P1D0B00, P1CA000, U011500. In some cases, not all DTCs from one of these groups are triggered. 243: 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 cycle in which the red 12 V fault message is displayed, the DC/DC converter does not support the 12 V on-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 faulty wake-up behavior of the DC/DC converter. The DCDC DTCs and warning messages may appear with a time delay. When accessing the vehicle, the white (243/465) HV warning message is displayed. When the HV system is switched on (charging, 12V supports, precon, ignition on), the yellow HV drive system warning message is displayed on the 243 with BMS30EB02 (see below for details). When the vehicle is started/PT-ready (displayed in the IC), the red 12V battery warning message is displayed for 243 and 465. Since the BMS on 243 uses the HV voltage value to check the auxiliary assembly fuse, the auxiliary assembly DTC can (with BMS30EB02) be stored as a consequence and the second (yellow) HV drive system warning message can be displayed in the IC. Remedy The faulty state of the DC/DC converter can always be rectified with an ignition change with BUS idle. The fact that the red 12 V warning message does not appear again is an indication of this. On vehicles with the yellow hybrid
drive system message, it is still displayed because it is not automatically reset once the faulty state is reset. Check the DC/DC converter for functionality via Xentry Diagnostics in the workshop: • Actuate BUCK mode for approx. 30 s • The output current normally jumps to a high value (e.g. 100 A) and then falls slowly to the current specified value e.g. 50 A and then only changes slowly and in small increments. 243 EB311/312 (BMS30EB01): Perform reset of the DC/DC converter, e.g. through a BUS idle or by clearing the fault memory, to exit the faulty state. 243 EB330 (BMS30EB02): Clear the fault memory, since the DTC for the auxiliary assembly fuse and the yellow hybrid drive system warning message are not automatically reset. 465: Perform reset of the DC/DC converter, e.g. through a BUS idle or by clearing the fault memory, to exit the faulty state. !!! Important note: Problems in this area do not have to be invoiced on the damage code for the DC/DC converter 54720. !!! Information: Cause analysis is still ongoing in order to determine a long-term remedy. In cases in which the fault profile occurs multiple times, replacement of the DC/DC converter can be carried out. This may help delay the fault profile from reoccurring.
DCDC223 Sensor fault codes due to faulty wake-up behavior
Topic number
LI54.10-P-079533
Version
3
Function group
54.10 - Battery, power supply, voltage converter
Date
9/15/25
Validity
The DC/DC converter type that is installed in model series 243 and 465 can be affected.
Reason for change
New information on problem and cause
Complaint
243: Red 12V battery message, white HV warning message, warning message in the IC and if applicable for vehicles
with BMS30EB02 yellow HV drive system
465: Red 12V battery message, white HV warning message, warning message in the IC
If the initial warning messages are ignored in the same ignition cycle, additional warning messages, e.g. red HV
warning message and yellow HV drive system warning message may be shown.
The DC/DC converter has stored a combination of the following two fault code groups:
1. P0C3B00, P0E9700, P0E5400, P0C4000.
2. P1D0B00, P1CA000, U011500.
In some cases, not all DTCs from one of these groups are triggered.
243: 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 cycle in which the red 12 V fault message is displayed, the DC/DC converter does not support the 12 V
on-board electrical system.
This means the 12 V battery may be discharged in the event of longer use.
Attachments
File
Description
DCDC223 243 Sensor issue gelbe Hybrid Antriebssystem 243 yellow HV drive system warning message - can only
WEM.jpg
be deleted via XENTRY
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© Copyright Mercedes-Benz AG
CCUSHWA
Page 1 / 4
Cause
In individual ignition cycles, this may result in faulty wake-up behavior of the DC/DC converter.
The DCDC DTCs and warning messages may appear with a time delay.
When accessing the vehicle, the white (243/465) HV warning message is displayed.
When the HV system is switched on (charging, 12V supports, precon, ignition on), the yellow HV drive system
warning message is displayed on the 243 with BMS30EB02 (see below for details).
When the vehicle is started/PT-ready (displayed in the IC), the red 12V battery warning message is displayed for 243
and 465.
Since the BMS on 243 uses the HV voltage value to check the auxiliary assembly fuse, the auxiliary assembly DTC
can (with BMS30EB02) be stored as a consequence and the second (yellow) HV drive system warning message can
be displayed in the IC.
Remedy
The faulty state of the DC/DC converter can always be rectified with an ignition change with BUS idle.
The fact that the red 12 V warning message does not appear again is an indication of this.
On vehicles with the yellow hybrid drive system message, it is still displayed because it is not automatically reset once
the faulty state is reset.
Check the DC/DC converter for functionality via Xentry Diagnostics in the workshop:
•
•
Actuate BUCK mode for approx. 30 s
The output current normally jumps to a high value (e.g. 100 A) and then falls slowly to the current specified value
e.g. 50 A and then only changes slowly and in small increments.
243 EB311/312 (BMS30EB01):
Perform reset of the DC/DC converter, e.g. through a BUS idle or by clearing the fault memory, to exit the faulty state.
16.09.2025 14:15
© Copyright Mercedes-Benz AG
CCUSHWA
Page 2 / 4
243 EB330 (BMS30EB02):
Clear the fault memory, since the DTC for the auxiliary assembly fuse and the yellow hybrid drive system warning
message are not automatically reset.
465:
Perform reset of the DC/DC converter, e.g. through a BUS idle or by clearing the fault memory, to exit the faulty state.
!!! Important note: Problems in this area do not have to be invoiced on the damage code for the DC/DC converter
54720. !!!
Information:
Cause analysis is still ongoing in order to determine a long-term remedy.
In cases in which the fault profile occurs multiple times, replacement of the DC/DC converter can be carried out.
This may help delay the fault profile from reoccurring.
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Overall vehicle > Power supply > Battery/On-board electrical system > Battery/on-board electrical system display
message > Low voltage Charge battery
Overall vehicle > Power supply > High-voltage on-board electrical system > High-voltage battery > Display message
Power generation > Engine management > Electric drive > Electric machine > Power reduced
Control unit/fault code
Control unit
Fault text
N83/1 - DC/DC converter (DDW) (DCDC223)
P1D0B00 - The internal power supply has a malfunction.
_
U011500 - Communication with control unit 'Drivetrain'
has a malfunction. _
P1CA000 - Initial startup was not performed. _
P0E5400 - Current sensor A of the DC/DC converter has
a short circuit to positive. _
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P0C3B00 - Temperature sensor A of the DC/DC converter has a short circuit to positive. _
P0E9700 - Voltage sensor C of the DC/DC converter has
a malfunction. _
P0C4000 - Temperature sensor B of the DC/DC converter
has a short circuit to positive. _
N82/9 - Battery management system (BMS) (BMS30EB02)
P0E2F00 - Electrical fuse B for the high voltage has a
malfunction. _
Operation numbers/damage codes
Op. no.
Operation text
16.09.2025 14:15
© Copyright Mercedes-Benz AG
Time
Damage
code
H
54720
CCUSHWA
Note
Page 4 / 4
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TSB/Document ID: LI54.10-P-079533
Replacement Service Bulletin Number:
MFR Communication Date: 2025-09-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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