LI54.10-P-069698 Service Bulletin/Repair Instructions

Functional Impairment of 48 V On-board Electrical System

Topic number
LI54.10-P-069698
Version
21
Function group
54.10 - Battery, power supply, voltage converter
Date
9/19/25
Validity
Model series 167, 257, 213, 238, 290 with code B01

Does Not apply to 223 or 206.
Reason for change
Remedy change
Complaint

This LI does Not apply to 223 or 206 which use a different generation of 48V systems. Please follow the relevant guided tests for the 223 and 206.

For 223 with fault code B1FCB97 follow LI54.10-P-076026.

Various causes are possible. The faults listed in the various causes do not all have to be present at all times. Some of

these complaints may overlap. Rely on the faults listed in the Cause section for identifying the correct Remedy.

1. No start

2. Yellow or red instrument cluster message for 48 V on-board electrical system battery (G1/3)

3. Limp home mode, overheating, A/C not blowing cold, or loss of acceleration

4. Check Engine Light
Cause

Cause 1: Software causes Intermittent No Starts with fault B183387 in DC/DC converter N83/1

Cause 2: Software causes Permanent No Start with fault B183349. May also have fault B183371.

Cause 3: Hardware short circuit in 48V system causes fault B183319 in 48V battery. May also have fault B183371.

Cause 4: Internal 48V battery Peltier cooling element failure causes fault B183397

Cause 5: This will Always have fault code B183371 but different from cause 2 and 3 -- it will Not have B183349,

B183319, or any other faults in the 48V battery. This will only have fault B183371 in 48V battery. Cause 5 is from the

48V battery detecting an abnormality which then causes the 48V battery to disconnect itself. The disconnected 48V

battery then causes subsequent symptoms: Limp Home Mode, overheating, A/C not blowing cold, or loss of acceleration

Cause 6: Check Engine Light with fault P0606F1 in the N127 PTCU
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© Copyright Mercedes-Benz AG
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Cause 7: Check Engine Light with possible no start and fault P057FF1
Remedy

Note: each of these remedies correspond to a specific cause. Make sure to match correct Cause with Remedy.

Remedy 1:
1.

2.

3.
Check the 12V power supply and LIN connection

Update software in G1/3 (48V battery) using newest XENTRY software and Add-ons

Road test and release vehicle if no further symptoms
Remedy 2:
1.

2.

3.
Charge the 12V battery (Charging current  Power supply > Battery/On-board electrical system > Battery function > Battery discharges

Overall vehicle > Power supply > Battery/On-board electrical system > Battery/on-board electrical system display

message > Battery/Alternator - Serviced Required
Control unit/fault code

Control unit
Fault text
N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)

B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)

B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)
N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)

B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)
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B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)

N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)

B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)

B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)
N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)

B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)

B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)
N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)
19.09.2025 18:41

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B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)

B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)

N83/1 - DC/DC converter (DDW) (DCDC48_222)
B183301 - The battery for the 48V on-board electrical

system has a malfunction. There is a general electrical

fault. (LIB48_222)

B183214 - The 48V on-board electrical system has a malfunction. There is a short circuit to ground or an open circuit. (LIB48_222)

B183216 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has not been attained. (LIB48_222)

B183217 - The 48V on-board electrical system has a malfunction. The limit value for electrical voltage has been

exceeded. (LIB48_222)

B183371 - The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.

(LIB48_222)

B183319 - The battery for the 48V on-board electrical

system has a malfunction. The limit value for current has

been exceeded. (LIB48_222)
Operation numbers/damage codes

Op. no.
Operation text
19.09.2025 18:41

© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage

code
Note
540HY73
Battery 48 V on-board electrical system - electrical fault
5416D73
DC/DC converter 48 V on-board

electrical system
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