Tesla
Tesla 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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CP_a001
Wall Connector will not start charging; vehicle shows 'Charging equipment not ready' and Tesla app shows CP_a001
Ground Fault Detected
CP_a002
Charging stops shortly after starting; Tesla app or vehicle shows CP_a002 and charging current drops to zero
Overcurrent or Internal Overload Protection Trip
CP_a003
Vehicle refuses to start charging and displays a ground connection error; Tesla app shows CP_a003
Missing or High‑Impedance Equipment Ground
CP_a004
Charging fails to start; vehicle shows 'Charging cable fault' and Tesla app logs CP_a004
Pilot Signal Communication Fault
CP_a005
Wall Connector LEDs show error pattern and app reports CP_a005; charging does not initiate
Contactor Welded or Stuck
CP_a006
Charging stops intermittently; the app shows CP_a006, and the vehicle reports 'Charging interrupted'.
Line Voltage Out of Range
CP_a007
Wall Connector LEDs indicate an error, and the app shows CP_a007; the charger will not energize.
Overtemperature Protection (Internal)
CP_a008
Charging fails with CP_a008; the vehicle may show 'Charging equipment communication error'.
Proximity / Latch Signal Fault
CP_a009
The Wall Connector shows an error, and the app logs CP_a009; no charging current is delivered.
Internal Self‑Test Failure
CP_a010
Charging stops, and the app shows CP_a010; the vehicle may report 'Charging limited by wall connector'.
Thermal Derating Due to High Connector or Cable Temperature
CP_a011
The Wall Connector LED pattern and the app show CP_a011; charging does not start.
Neutral/Earth Fault or Miswire (where applicable)
CP_a012
The app shows CP_a012; Wall Connector LEDs indicate an error; charging is disabled.
Residual Current Device (RCD) Trip / Leakage Current Detected
CP_a013
The Wall Connector will not connect to the vehicle; the app shows CP_a013, and Wi‑Fi setup may fail.
Internal Communication Bus Error
CP_a014
The load sharing group of Wall Connectors is not balancing current; the app shows CP_a014 on one or more units.
Load Sharing / Network Communication Fault Between Wall Connectors
CP_a015
Wall Connector LEDs show an error; the app logs CP_a015; the charger appears dead or reboots repeatedly.
Internal Low‑Voltage Power Supply Failure
CP_a016
Charging limited or disabled; app shows CP_a016; vehicle may show 'Charging limited by grid configuration'.
Incorrect Grid Type or Phase Configuration
CP_a017
App shows CP_a017; Wall Connector LEDs indicate an error; charging may start then immediately stop.
Vehicle Identification / Handshake Failure
CP_a018
Wall Connector shows CP_a018; charging current is reduced significantly below the configured maximum.
Dynamic Load Management / Current Limiting Triggered
CP_a019
App shows CP_a019; Wall Connector LEDs flash an error; the unit cannot connect to Wi-Fi or cloud services.
Wi-Fi Module or Network Failure
CP_a020
Wall Connector LEDs show an error; the app logs CP_a020; the charger appears unresponsive after power events.
Brownout / Power Quality Event Detected
Symptom
Breaker trips immediately or shortly after starting a charge session.
Short Circuit or Overcurrent on EV Circuit
Symptom
Charging starts but stops after a few minutes without any explicit error code on the vehicle; Wall Connector LEDs may show a brief fault pattern.
Intermittent Connection or Thermal Cutback
Symptom
Tesla app cannot see or control the Wall Connector, but the charger still works when plugging in
Cloud Connectivity or App Integration Failure
Symptom
The Wall Connector or surrounding wall feels warm or hot to the touch during charging.
Overheating at Terminal Block or Internal Components
Symptom
User receives mild shock or tingling when touching vehicle body while connected to Wall Connector
Stray Voltage / Grounding Issue
Symptom
Vehicle charges very slowly compared to expected rate, without any explicit error code
Reduced Charging Current Configuration or Supply Limitation
Symptom
Vehicle does not recognize that the connector is plugged in; no charging icon, no latch sound.
Mechanical Misalignment or Damaged Connector Pins
Symptom
Vehicle reports 'Charging cable too hot' or the handle feels very hot during charging.
Overheating Charge Handle or Cable
Symptom
Vehicle will not start charging at scheduled times, though manual plug‑in sometimes works
Scheduling or Time‑Based Control Conflict
Symptom
Visible burn marks, melted plastic, or smoke residue on or around Wall Connector
Thermal Damage / Localized Fire Event
Symptom
Wall Connector LEDs do not follow documented patterns; random flashing or stuck lights, but charging may still work intermittently
LED Driver or Firmware Display Anomaly
Symptom
Wall Connector cable insulation shows cracks, cuts, or severe wear.
Degraded or Damaged Charge Cable Insulation
Symptom
Wall Connector completely dead: no LEDs, no response, vehicle does not detect a connection.
No Power to Wall Connector
Symptom
Wall Connector emits a persistent humming or buzzing sound even when not charging
Transformer or Power Supply Noise
Symptom
Wall Connector frequently disconnects from Wi-Fi, causing intermittent app visibility and firmware update failures.
Unstable Wireless Connectivity
Symptom
Wall Connector front cover or enclosure is cracked, loose, or damaged, but the unit still charges.
Mechanical Enclosure Damage
Symptom
Wall Connector makes loud clicking, buzzing, or chattering noises when starting or during charging
Noisy or Failing Contactor
Symptom
Water or condensation visible inside Wall Connector cover or around cable entry
Moisture Ingress into Enclosure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CP_a001 |
Wall Connector will not start charging; vehicle shows 'Charging equipment not ready' and Tesla app shows CP_a001
|
Ground Fault Detected | View Details |
| CP_a002 |
Charging stops shortly after starting; Tesla app or vehicle shows CP_a002 and charging current drops to zero
|
Overcurrent or Internal Overload Protection Trip | View Details |
| CP_a003 |
Vehicle refuses to start charging and displays a ground connection error; Tesla app shows CP_a003
|
Missing or High‑Impedance Equipment Ground | View Details |
| CP_a004 |
Charging fails to start; vehicle shows 'Charging cable fault' and Tesla app logs CP_a004
|
Pilot Signal Communication Fault | View Details |
| CP_a005 |
Wall Connector LEDs show error pattern and app reports CP_a005; charging does not initiate
|
Contactor Welded or Stuck | View Details |
| CP_a006 |
Charging stops intermittently; the app shows CP_a006, and the vehicle reports 'Charging interrupted'.
|
Line Voltage Out of Range | View Details |
| CP_a007 |
Wall Connector LEDs indicate an error, and the app shows CP_a007; the charger will not energize.
|
Overtemperature Protection (Internal) | View Details |
| CP_a008 |
Charging fails with CP_a008; the vehicle may show 'Charging equipment communication error'.
|
Proximity / Latch Signal Fault | View Details |
| CP_a009 |
The Wall Connector shows an error, and the app logs CP_a009; no charging current is delivered.
|
Internal Self‑Test Failure | View Details |
| CP_a010 |
Charging stops, and the app shows CP_a010; the vehicle may report 'Charging limited by wall connector'.
|
Thermal Derating Due to High Connector or Cable Temperature | View Details |
| CP_a011 |
The Wall Connector LED pattern and the app show CP_a011; charging does not start.
|
Neutral/Earth Fault or Miswire (where applicable) | View Details |
| CP_a012 |
The app shows CP_a012; Wall Connector LEDs indicate an error; charging is disabled.
|
Residual Current Device (RCD) Trip / Leakage Current Detected | View Details |
| CP_a013 |
The Wall Connector will not connect to the vehicle; the app shows CP_a013, and Wi‑Fi setup may fail.
|
Internal Communication Bus Error | View Details |
| CP_a014 |
The load sharing group of Wall Connectors is not balancing current; the app shows CP_a014 on one or more units.
|
Load Sharing / Network Communication Fault Between Wall Connectors | View Details |
| CP_a015 |
Wall Connector LEDs show an error; the app logs CP_a015; the charger appears dead or reboots repeatedly.
|
Internal Low‑Voltage Power Supply Failure | View Details |
| CP_a016 |
Charging limited or disabled; app shows CP_a016; vehicle may show 'Charging limited by grid configuration'.
|
Incorrect Grid Type or Phase Configuration | View Details |
| CP_a017 |
App shows CP_a017; Wall Connector LEDs indicate an error; charging may start then immediately stop.
|
Vehicle Identification / Handshake Failure | View Details |
| CP_a018 |
Wall Connector shows CP_a018; charging current is reduced significantly below the configured maximum.
|
Dynamic Load Management / Current Limiting Triggered | View Details |
| CP_a019 |
App shows CP_a019; Wall Connector LEDs flash an error; the unit cannot connect to Wi-Fi or cloud services.
|
Wi-Fi Module or Network Failure | View Details |
| CP_a020 |
Wall Connector LEDs show an error; the app logs CP_a020; the charger appears unresponsive after power events.
|
Brownout / Power Quality Event Detected | View Details |
| – |
Breaker trips immediately or shortly after starting a charge session.
|
Short Circuit or Overcurrent on EV Circuit | View Details |
| – |
Charging starts but stops after a few minutes without any explicit error code on the vehicle; Wall Connector LEDs may show a brief fault pattern.
|
Intermittent Connection or Thermal Cutback | View Details |
| – |
Tesla app cannot see or control the Wall Connector, but the charger still works when plugging in
|
Cloud Connectivity or App Integration Failure | View Details |
| – |
The Wall Connector or surrounding wall feels warm or hot to the touch during charging.
|
Overheating at Terminal Block or Internal Components | View Details |
| – |
User receives mild shock or tingling when touching vehicle body while connected to Wall Connector
|
Stray Voltage / Grounding Issue | View Details |
| – |
Vehicle charges very slowly compared to expected rate, without any explicit error code
|
Reduced Charging Current Configuration or Supply Limitation | View Details |
| – |
Vehicle does not recognize that the connector is plugged in; no charging icon, no latch sound.
|
Mechanical Misalignment or Damaged Connector Pins | View Details |
| – |
Vehicle reports 'Charging cable too hot' or the handle feels very hot during charging.
|
Overheating Charge Handle or Cable | View Details |
| – |
Vehicle will not start charging at scheduled times, though manual plug‑in sometimes works
|
Scheduling or Time‑Based Control Conflict | View Details |
| – |
Visible burn marks, melted plastic, or smoke residue on or around Wall Connector
|
Thermal Damage / Localized Fire Event | View Details |
| – |
Wall Connector LEDs do not follow documented patterns; random flashing or stuck lights, but charging may still work intermittently
|
LED Driver or Firmware Display Anomaly | View Details |
| – |
Wall Connector cable insulation shows cracks, cuts, or severe wear.
|
Degraded or Damaged Charge Cable Insulation | View Details |
| – |
Wall Connector completely dead: no LEDs, no response, vehicle does not detect a connection.
|
No Power to Wall Connector | View Details |
| – |
Wall Connector emits a persistent humming or buzzing sound even when not charging
|
Transformer or Power Supply Noise | View Details |
| – |
Wall Connector frequently disconnects from Wi-Fi, causing intermittent app visibility and firmware update failures.
|
Unstable Wireless Connectivity | View Details |
| – |
Wall Connector front cover or enclosure is cracked, loose, or damaged, but the unit still charges.
|
Mechanical Enclosure Damage | View Details |
| – |
Wall Connector makes loud clicking, buzzing, or chattering noises when starting or during charging
|
Noisy or Failing Contactor | View Details |
| – |
Water or condensation visible inside Wall Connector cover or around cable entry
|
Moisture Ingress into Enclosure | View Details |
No matching codes found
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