General Motors
General Motors 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
The charger will not start charging; the vehicle displays 'Charging Error' and the GM home charger display shows E01 shortly after plugging in.
Pilot Signal Communication Fault
E02
The GM home charger displays E02 and refuses to start charging; the vehicle may show a 'Check Power Source' or 'Unable to Charge' message.
Ground Fault / Leakage Current Detected
E03
The charger displays E03 and does not energize; the vehicle does not begin charging and may not show any charging indicator.
Proximity / Latch Switch Fault
E04
The GM EV home charger displays E04 and will not charge; this often occurs after installation or after electrical work in the home.
Line Voltage Out of Range
E05
The charger displays E05 during charging or at startup; charging stops or never begins.
Overcurrent / Output Overload Fault
E06
The GM home charger displays E06 and charging stops; this may occur after long charging sessions or in hot weather.
Overtemperature Shutdown
E07
The charger displays E07 and will not start; this is often associated with the tripping of the home’s breaker or RCD/GFCI device.
Internal Short Circuit / Hardware Failure
E08
The GM charger displays E08; the vehicle may show a 'Grounding Issue' or similar message and refuse to charge.
Ground Connection Fault / High Ground Impedance
E09
The charger displays E09 and charging stops; this may occur when the vehicle is nearly full or when charging starts and stops repeatedly.
Relay / Contactor Weld Detection
E10
The GM charger displays E10 and refuses to start charging; this often occurs after a firmware update or power outage.
Internal Communication / Firmware Integrity Error
E11
Charger displays E11; vehicle may begin charging briefly then stop with an error.
Pilot Duty Cycle / Current Limit Mismatch
E12
GM charger displays E12 and does not charge; often associated with network or smart-home features not working.
Network Module / Cloud Communication Error
E13
Charger displays E13; LED indicators may flash in a repeating pattern, and charging is disabled.
Self-Test Failure / Internal Diagnostics Error
E14
GM charger displays E14 and may intermittently start and stop charging.
Vehicle Communication Timeout
E15
Charger displays E15; charging may be limited or disabled when used with certain GM vehicles.
Vehicle Compatibility / Identification Error
E16
GM charger displays E16, and the home’s GFCI breaker or RCD trips when charging starts.
Excessive Leakage Current / Nuisance Tripping
E17
Charger displays E17; LEDs may indicate a lockout state, and the unit will not respond to plug-in.
Lockout / Tamper Detection
E18
GM charger displays E18; charging may start but is limited to a very low current or stops unexpectedly.
Current Sensing / Calibration Error
E19
Charger displays E19; vehicle may show ‘Charging Paused by Station’ even though no schedule is set.
Scheduling / Load Management Fault
E20
GM charger displays E20 and refuses to charge when connected through a GM-branded load-sharing or dual-charger setup.
Load Sharing / Master-Slave Communication Error
Symptom
Charging starts normally but stops after 5–30 minutes with no error code on the GM charger; the vehicle simply reports ‘Charging Stopped’ or ‘Charging Interrupted’.
Intermittent Thermal or Supply Dropout
Symptom
GM EV home charger appears to charge at a lower rate than expected; the vehicle shows fewer kW than the charger's rated output.
Reduced Output Current / Derating
Symptom
GM EV home charger has no power at all; no LEDs or display, and the vehicle does not recognize the charger.
No AC Supply / Internal Fuse Open
Symptom
GM EV home charger's Wi-Fi or app connectivity is unreliable; smart features fail, but basic charging still works.
Weak or Unstable Network Connectivity
Symptom
GM charger intermittently fails to release the connector latch electronically (if equipped with a locking feature), making it hard to unplug.
Connector Lock Mechanism Malfunction
Symptom
GM charger's LEDs or display flicker, reset, or go dark momentarily during charging, but charging may resume automatically.
Intermittent Low-Voltage Power to Control Board
Symptom
GM charger's scheduled charging does not start at the programmed time, or starts at incorrect times, while manual charging works.
Scheduling / Clock Drift Without Error Code
Symptom
Noticeable buzzing, humming, or clicking noises from the GM EV home charger during operation, louder than when new.
Mechanical Noise from Contactor or Transformer
Symptom
The GM EV home charger emits a burning smell or visible smoke during or shortly after starting a charge.
Internal Overheating / Component Failure
Symptom
The GM EV home charger gets very hot to the touch during charging, even at moderate current, but continues to operate.
Excessive Operating Temperature Without Trip
Symptom
The GM charger powers on and shows ready, but when plugged into the GM EV, the vehicle does not start charging and displays ‘Check Charger’ with no code on the charger.
Handshake Failure Without Displayed Code
Symptom
The GM charger’s J1772 connector is difficult to insert into or remove from the vehicle’s charge port; it requires excessive force.
Connector Mechanical Wear / Deformation
Symptom
The breaker feeding the GM EV home charger trips as soon as or shortly after turning it ON, even with no vehicle connected.
Input Short / Ground Fault in Charger
Symptom
Visible discoloration, browning, or melting on the GM charger’s J1772 connector or at the point where the cable enters the handle.
Overheating at Connector Contacts
Symptom
Water or condensation visible on or around the GM EV home charger enclosure; occasional charging interruptions during or after rain.
Moisture Ingress / Inadequate Weather Sealing
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
The charger will not start charging; the vehicle displays 'Charging Error' and the GM home charger display shows E01 shortly after plugging in.
|
Pilot Signal Communication Fault | View Details |
| E02 |
The GM home charger displays E02 and refuses to start charging; the vehicle may show a 'Check Power Source' or 'Unable to Charge' message.
|
Ground Fault / Leakage Current Detected | View Details |
| E03 |
The charger displays E03 and does not energize; the vehicle does not begin charging and may not show any charging indicator.
|
Proximity / Latch Switch Fault | View Details |
| E04 |
The GM EV home charger displays E04 and will not charge; this often occurs after installation or after electrical work in the home.
|
Line Voltage Out of Range | View Details |
| E05 |
The charger displays E05 during charging or at startup; charging stops or never begins.
|
Overcurrent / Output Overload Fault | View Details |
| E06 |
The GM home charger displays E06 and charging stops; this may occur after long charging sessions or in hot weather.
|
Overtemperature Shutdown | View Details |
| E07 |
The charger displays E07 and will not start; this is often associated with the tripping of the home’s breaker or RCD/GFCI device.
|
Internal Short Circuit / Hardware Failure | View Details |
| E08 |
The GM charger displays E08; the vehicle may show a 'Grounding Issue' or similar message and refuse to charge.
|
Ground Connection Fault / High Ground Impedance | View Details |
| E09 |
The charger displays E09 and charging stops; this may occur when the vehicle is nearly full or when charging starts and stops repeatedly.
|
Relay / Contactor Weld Detection | View Details |
| E10 |
The GM charger displays E10 and refuses to start charging; this often occurs after a firmware update or power outage.
|
Internal Communication / Firmware Integrity Error | View Details |
| E11 |
Charger displays E11; vehicle may begin charging briefly then stop with an error.
|
Pilot Duty Cycle / Current Limit Mismatch | View Details |
| E12 |
GM charger displays E12 and does not charge; often associated with network or smart-home features not working.
|
Network Module / Cloud Communication Error | View Details |
| E13 |
Charger displays E13; LED indicators may flash in a repeating pattern, and charging is disabled.
|
Self-Test Failure / Internal Diagnostics Error | View Details |
| E14 |
GM charger displays E14 and may intermittently start and stop charging.
|
Vehicle Communication Timeout | View Details |
| E15 |
Charger displays E15; charging may be limited or disabled when used with certain GM vehicles.
|
Vehicle Compatibility / Identification Error | View Details |
| E16 |
GM charger displays E16, and the home’s GFCI breaker or RCD trips when charging starts.
|
Excessive Leakage Current / Nuisance Tripping | View Details |
| E17 |
Charger displays E17; LEDs may indicate a lockout state, and the unit will not respond to plug-in.
|
Lockout / Tamper Detection | View Details |
| E18 |
GM charger displays E18; charging may start but is limited to a very low current or stops unexpectedly.
|
Current Sensing / Calibration Error | View Details |
| E19 |
Charger displays E19; vehicle may show ‘Charging Paused by Station’ even though no schedule is set.
|
Scheduling / Load Management Fault | View Details |
| E20 |
GM charger displays E20 and refuses to charge when connected through a GM-branded load-sharing or dual-charger setup.
|
Load Sharing / Master-Slave Communication Error | View Details |
| – |
Charging starts normally but stops after 5–30 minutes with no error code on the GM charger; the vehicle simply reports ‘Charging Stopped’ or ‘Charging Interrupted’.
|
Intermittent Thermal or Supply Dropout | View Details |
| – |
GM EV home charger appears to charge at a lower rate than expected; the vehicle shows fewer kW than the charger's rated output.
|
Reduced Output Current / Derating | View Details |
| – |
GM EV home charger has no power at all; no LEDs or display, and the vehicle does not recognize the charger.
|
No AC Supply / Internal Fuse Open | View Details |
| – |
GM EV home charger's Wi-Fi or app connectivity is unreliable; smart features fail, but basic charging still works.
|
Weak or Unstable Network Connectivity | View Details |
| – |
GM charger intermittently fails to release the connector latch electronically (if equipped with a locking feature), making it hard to unplug.
|
Connector Lock Mechanism Malfunction | View Details |
| – |
GM charger's LEDs or display flicker, reset, or go dark momentarily during charging, but charging may resume automatically.
|
Intermittent Low-Voltage Power to Control Board | View Details |
| – |
GM charger's scheduled charging does not start at the programmed time, or starts at incorrect times, while manual charging works.
|
Scheduling / Clock Drift Without Error Code | View Details |
| – |
Noticeable buzzing, humming, or clicking noises from the GM EV home charger during operation, louder than when new.
|
Mechanical Noise from Contactor or Transformer | View Details |
| – |
The GM EV home charger emits a burning smell or visible smoke during or shortly after starting a charge.
|
Internal Overheating / Component Failure | View Details |
| – |
The GM EV home charger gets very hot to the touch during charging, even at moderate current, but continues to operate.
|
Excessive Operating Temperature Without Trip | View Details |
| – |
The GM charger powers on and shows ready, but when plugged into the GM EV, the vehicle does not start charging and displays ‘Check Charger’ with no code on the charger.
|
Handshake Failure Without Displayed Code | View Details |
| – |
The GM charger’s J1772 connector is difficult to insert into or remove from the vehicle’s charge port; it requires excessive force.
|
Connector Mechanical Wear / Deformation | View Details |
| – |
The breaker feeding the GM EV home charger trips as soon as or shortly after turning it ON, even with no vehicle connected.
|
Input Short / Ground Fault in Charger | View Details |
| – |
Visible discoloration, browning, or melting on the GM charger’s J1772 connector or at the point where the cable enters the handle.
|
Overheating at Connector Contacts | View Details |
| – |
Water or condensation visible on or around the GM EV home charger enclosure; occasional charging interruptions during or after rain.
|
Moisture Ingress / Inadequate Weather Sealing | View Details |
No matching codes found
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