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; app shows CP_a006 and vehicle reports 'Charging interrupted'	Line Voltage Out of Range	View Details
CP_a007	Wall Connector LEDs indicate error and app shows CP_a007; charger will not energize	Overtemperature Protection (Internal)	View Details
CP_a008	Charging fails with CP_a008; vehicle may show 'Charging equipment communication error'	Proximity / Latch Signal Fault	View Details
CP_a009	Wall Connector shows error and app logs CP_a009; no charging current delivered	Internal Self‑Test Failure	View Details
CP_a010	Charging stops and app shows CP_a010; vehicle may report 'Charging limited by wall connector'	Thermal Derating Due to High Connector or Cable Temperature	View Details
CP_a011	Wall Connector LED pattern and app show CP_a011; charging does not start	Neutral/Earth Fault or Miswire (where applicable)	View Details
CP_a012	App shows CP_a012; Wall Connector LEDs indicate error; charging is disabled	Residual Current Device (RCD) Trip / Leakage Current Detected	View Details
CP_a013	Wall Connector will not connect to vehicle; app shows CP_a013 and Wi‑Fi setup may fail	Internal Communication Bus Error	View Details
CP_a014	Load sharing group of Wall Connectors not balancing current; 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 error; app logs CP_a015; 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 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 configured maximum	Dynamic Load Management / Current Limiting Triggered	View Details
CP_a019	App shows CP_a019; Wall Connector LEDs flash error; unit cannot connect to Wi‑Fi or cloud services	Wi‑Fi Module or Network Failure	View Details
CP_a020	Wall Connector LEDs show error; app logs CP_a020; 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 vehicle; Wall Connector LEDs may show 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
–	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 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 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 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 unit still charges	Mechanical Enclosure Damage	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 makes loud clicking, buzzing, or chattering noises when starting or during charging	Noisy or Failing Contactor	View Details
–	Wall Connector or surrounding wall feels warm or hot to the touch during charging	Overheating at Terminal Block or Internal Components	View Details
–	Water or condensation visible inside Wall Connector cover or around cable entry	Moisture Ingress into Enclosure	View Details

Tesla EV Home Chargers Error Codes

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