Mercedes-Benz
Mercedes-Benz EV Home Chargers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Charger will not start charging; vehicle shows ‘Charging not possible’ and wallbox display shows E01 shortly after plugging in.
Proximity Pilot / Plug Detection Fault
E02
Charging session aborts immediately; wallbox display shows E02 and vehicle reports ‘Check charging station’.
Control Pilot Signal Fault
E03
Wallbox shows E03 and refuses to start charging; status LED may flash red/orange; vehicle may show ‘Ground fault’ or ‘Charging station error’.
Integrated DC Residual Current Device (RCD) Trip
E04
Wallbox display shows E04; charging does not start; upstream breaker may trip intermittently.
Line-to-Line or Line-to-Neutral Short / Internal Overcurrent Fault
E05
Wallbox shows E05 and refuses to charge; vehicle may show ‘Incorrect supply voltage’ or ‘Charging station fault’.
Supply Voltage Out of Range
E06
Wallbox shows E06; charging stops or does not start; LEDs may flash red; often occurs during hot weather or long charging sessions.
Overtemperature Protection Triggered
E07
Wallbox shows E07; charging does not start; vehicle may show ‘PE error’ or ‘Check grounding’.
Protective Earth (PE) Fault / Grounding Error
E08
Wallbox shows E08; charging stops unexpectedly; may coincide with upstream RCD tripping.
AC Residual Current Device Trip / Leakage Detection
E09
Wallbox shows E09; charging does not start; often after a power outage or surge event.
Surge Protection / MOV Module Fault
E10
Wallbox shows E10; charging current is limited or charging does not start; often associated with load management or smart energy features.
External Load Management / Communication Fault
E11
Wallbox shows E11; charging stops or does not start; often when using RFID cards or app-based authorization.
Authorization / RFID Reader Fault
E12
Wallbox shows E12; charging power is lower than expected; vehicle may show reduced charging rate.
Phase Loss / Asymmetry Detection
E13
Wallbox shows E13; charging does not start; often after a failed firmware update or power interruption during update.
Firmware Corruption / Bootloader Error
E14
Wallbox shows E14; charging stops shortly after start; vehicle may show ‘Overcurrent’ or ‘Charging interrupted’.
Overcurrent Detection / Output Overload
E15
Wallbox shows E15; LEDs may indicate fault; charger does not respond to plug-in.
Internal Power Supply Fault
E16
Wallbox shows E16; charging does not start; often associated with smart connectivity features.
Wi-Fi / Network Communication Fault
E17
Wallbox shows E17; charging is disabled; may be linked to integrated energy meter issues.
Internal Energy Meter Fault
E18
Wallbox shows E18; charging is blocked; often when multiple Mercedes-Benz wallboxes are installed in a cluster.
Master/Slave Load Sharing Communication Error
E19
Wallbox shows E19; charging stops; vehicle may show ‘Pilot error’ or ‘Charging interrupted by station’.
Control Pilot Duty Cycle / PWM Error
E20
Wallbox shows E20; charging is disabled; may appear after tamper or cover removal.
Enclosure Tamper / Safety Interlock Fault
Symptom
Charging is very slow compared to expected rate, but no error codes are shown.
Reduced Charging Current / Derating
Symptom
Integrated cable holder or hook on the wallbox is broken, making it difficult to store the cable safely.
Accessory / Cable Management Failure
Symptom
Vehicle shows ‘Charging not possible’ but wallbox LEDs appear normal; no specific error code displayed on wallbox.
Intermittent Communication / Handshake Failure
Symptom
Wallbox clicks (relay sound) but charging does not start; vehicle repeatedly connects and disconnects.
Relay Actuation Without Stable Pilot Signal
Symptom
Wallbox completely dead – no LEDs, no display, vehicle does not detect connection.
No Power / Dead Unit
Symptom
Wallbox display or LEDs are on, but it does not react to plugging in the vehicle; no relay click, no charging attempt.
Plug Detection / Proximity Circuit Failure
Symptom
Wallbox emits a burning smell or visible smoke during or after charging.
Severe Overheating / Component Failure
Symptom
Wallbox enclosure shows signs of water inside (condensation, droplets) or corrosion on terminals.
Moisture Ingress / IP Rating Compromised
Symptom
Wallbox fan (if equipped) runs loudly or continuously, even at low load or when idle.
Cooling System Overactivity
Symptom
Wallbox frequently disconnects from the Mercedes-Benz app or loses remote connectivity, but local charging works.
Unstable Network / Connectivity Issue
Symptom
Wallbox front panel or display is cracked or physically damaged, but charging may still function.
Mechanical Enclosure Damage
Symptom
Wallbox ground or earth wire shows signs of overheating or discoloration at the terminal.
Overheated Protective Earth Connection
Symptom
Wallbox LEDs or display flicker or dim intermittently while charging, but charging continues.
Low-Voltage Supply Instability
Symptom
Wallbox makes a buzzing or humming noise during operation, louder than usual.
Mechanical Vibration of Contactor or Transformer
Symptom
Wallbox or cable becomes unusually warm to the touch during normal charging, without any error codes.
Localized Overheating / High Contact Resistance
Symptom
Wallbox RFID reader area is scratched or cloudy, making it hard for cards to be recognized.
RFID Reader Window Wear
Symptom
Wallbox time schedules or charging profiles do not execute as programmed; charging starts immediately instead of at set times.
Scheduling / Timer Function Malfunction
Symptom
Wallbox trips the household RCD/RCBO as soon as charging starts, but no specific wallbox error is displayed.
Nuisance or Genuine Earth Leakage Trip
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Charger will not start charging; vehicle shows ‘Charging not possible’ and wallbox display shows E01 shortly after plugging in.
|
Proximity Pilot / Plug Detection Fault | View Details |
| E02 |
Charging session aborts immediately; wallbox display shows E02 and vehicle reports ‘Check charging station’.
|
Control Pilot Signal Fault | View Details |
| E03 |
Wallbox shows E03 and refuses to start charging; status LED may flash red/orange; vehicle may show ‘Ground fault’ or ‘Charging station error’.
|
Integrated DC Residual Current Device (RCD) Trip | View Details |
| E04 |
Wallbox display shows E04; charging does not start; upstream breaker may trip intermittently.
|
Line-to-Line or Line-to-Neutral Short / Internal Overcurrent Fault | View Details |
| E05 |
Wallbox shows E05 and refuses to charge; vehicle may show ‘Incorrect supply voltage’ or ‘Charging station fault’.
|
Supply Voltage Out of Range | View Details |
| E06 |
Wallbox shows E06; charging stops or does not start; LEDs may flash red; often occurs during hot weather or long charging sessions.
|
Overtemperature Protection Triggered | View Details |
| E07 |
Wallbox shows E07; charging does not start; vehicle may show ‘PE error’ or ‘Check grounding’.
|
Protective Earth (PE) Fault / Grounding Error | View Details |
| E08 |
Wallbox shows E08; charging stops unexpectedly; may coincide with upstream RCD tripping.
|
AC Residual Current Device Trip / Leakage Detection | View Details |
| E09 |
Wallbox shows E09; charging does not start; often after a power outage or surge event.
|
Surge Protection / MOV Module Fault | View Details |
| E10 |
Wallbox shows E10; charging current is limited or charging does not start; often associated with load management or smart energy features.
|
External Load Management / Communication Fault | View Details |
| E11 |
Wallbox shows E11; charging stops or does not start; often when using RFID cards or app-based authorization.
|
Authorization / RFID Reader Fault | View Details |
| E12 |
Wallbox shows E12; charging power is lower than expected; vehicle may show reduced charging rate.
|
Phase Loss / Asymmetry Detection | View Details |
| E13 |
Wallbox shows E13; charging does not start; often after a failed firmware update or power interruption during update.
|
Firmware Corruption / Bootloader Error | View Details |
| E14 |
Wallbox shows E14; charging stops shortly after start; vehicle may show ‘Overcurrent’ or ‘Charging interrupted’.
|
Overcurrent Detection / Output Overload | View Details |
| E15 |
Wallbox shows E15; LEDs may indicate fault; charger does not respond to plug-in.
|
Internal Power Supply Fault | View Details |
| E16 |
Wallbox shows E16; charging does not start; often associated with smart connectivity features.
|
Wi-Fi / Network Communication Fault | View Details |
| E17 |
Wallbox shows E17; charging is disabled; may be linked to integrated energy meter issues.
|
Internal Energy Meter Fault | View Details |
| E18 |
Wallbox shows E18; charging is blocked; often when multiple Mercedes-Benz wallboxes are installed in a cluster.
|
Master/Slave Load Sharing Communication Error | View Details |
| E19 |
Wallbox shows E19; charging stops; vehicle may show ‘Pilot error’ or ‘Charging interrupted by station’.
|
Control Pilot Duty Cycle / PWM Error | View Details |
| E20 |
Wallbox shows E20; charging is disabled; may appear after tamper or cover removal.
|
Enclosure Tamper / Safety Interlock Fault | View Details |
| – |
Charging is very slow compared to expected rate, but no error codes are shown.
|
Reduced Charging Current / Derating | View Details |
| – |
Integrated cable holder or hook on the wallbox is broken, making it difficult to store the cable safely.
|
Accessory / Cable Management Failure | View Details |
| – |
Vehicle shows ‘Charging not possible’ but wallbox LEDs appear normal; no specific error code displayed on wallbox.
|
Intermittent Communication / Handshake Failure | View Details |
| – |
Wallbox clicks (relay sound) but charging does not start; vehicle repeatedly connects and disconnects.
|
Relay Actuation Without Stable Pilot Signal | View Details |
| – |
Wallbox completely dead – no LEDs, no display, vehicle does not detect connection.
|
No Power / Dead Unit | View Details |
| – |
Wallbox display or LEDs are on, but it does not react to plugging in the vehicle; no relay click, no charging attempt.
|
Plug Detection / Proximity Circuit Failure | View Details |
| – |
Wallbox emits a burning smell or visible smoke during or after charging.
|
Severe Overheating / Component Failure | View Details |
| – |
Wallbox enclosure shows signs of water inside (condensation, droplets) or corrosion on terminals.
|
Moisture Ingress / IP Rating Compromised | View Details |
| – |
Wallbox fan (if equipped) runs loudly or continuously, even at low load or when idle.
|
Cooling System Overactivity | View Details |
| – |
Wallbox frequently disconnects from the Mercedes-Benz app or loses remote connectivity, but local charging works.
|
Unstable Network / Connectivity Issue | View Details |
| – |
Wallbox front panel or display is cracked or physically damaged, but charging may still function.
|
Mechanical Enclosure Damage | View Details |
| – |
Wallbox ground or earth wire shows signs of overheating or discoloration at the terminal.
|
Overheated Protective Earth Connection | View Details |
| – |
Wallbox LEDs or display flicker or dim intermittently while charging, but charging continues.
|
Low-Voltage Supply Instability | View Details |
| – |
Wallbox makes a buzzing or humming noise during operation, louder than usual.
|
Mechanical Vibration of Contactor or Transformer | View Details |
| – |
Wallbox or cable becomes unusually warm to the touch during normal charging, without any error codes.
|
Localized Overheating / High Contact Resistance | View Details |
| – |
Wallbox RFID reader area is scratched or cloudy, making it hard for cards to be recognized.
|
RFID Reader Window Wear | View Details |
| – |
Wallbox time schedules or charging profiles do not execute as programmed; charging starts immediately instead of at set times.
|
Scheduling / Timer Function Malfunction | View Details |
| – |
Wallbox trips the household RCD/RCBO as soon as charging starts, but no specific wallbox error is displayed.
|
Nuisance or Genuine Earth Leakage Trip | View Details |
No matching codes found
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