Tesla Alert Codes Explained

Every Tesla reports internal alert codes (like BMS_a117) when something needs attention. Search the dictionary below to find what an alert means and what to do about it. MyTeslaMate logs them automatically: hosted TeslaMate with no server to run.

Signal Name	Description	Condition	Impact	Important
EPAS3P_a047_motPosCorrError	Difference between motor position sensor 1 and 2 exceeded threshold	\|MPS1 - MPS2\| > 15 degrees	Reduced assist and EAC inhibited	No
EPAS3P_a046_motPos2tempError	Motor position temperature sensor 2 error	Motor position temperature sensor 2 error	Reduced steering assist	No
EPAS3P_a045_motPos2LogicError	Motor position sensor 2 logic error	Motor position sensor 2 logic error	Reduced steering assist	No
EPAS3P_a044_motPos2MagnetMia	Motor position sensor 2 magnetic field not detected	Motor position sensor 2 magnetic field not detected	Reduced steering assist	No
EPAS3P_a043_motPos2Uv	Motor position sensor 2 signal undervoltage	Motor position sensor 2 signal undervoltage	Reduced steering assist	No
EPAS3P_a042_motPos2ParityError	Motor position sensor 2 signal invalid	Motor position sensor 2 signal invalid	Reduced steering assist	No
EPAS3P_a041_motPos1tempError	Motor position temperature sensor 1 error	Motor position temperature sensor 1 error	Reduced steering assist	No
EPAS3P_a040_motPos1LogicError	Motor position sensor 1 logic error	Motor position sensor 1 logic error	Reduced steering assist	No
EPAS3P_a039_motPos1MagnetMia	Motor position sensor 1 magnetic field not detected	Motor position sensor 1 magnetic field not detected	Reduced steering assist	No
EPAS3P_a038_motPos1Uv	Motor position sensor 1 signal undervoltage	Motor position sensor 1 signal undervoltage	Reduced steering assist	No
EPAS3P_a037_motPos1ParityError	Motor position sensor 1 signal invalid	Invalid Motor Position sensor 1 signal received	EAC inhibited	No
EPAS3P_a036_vbbSupplyOv	Gate drive supply undervoltage	Gate drive supply undervoltage	Reduced steering assist	No
EPAS3P_a035_vbbSupplyUv	Gate drive supply undervoltage	Gate drive suppl undervoltage	Reduced steering assist	No
EPAS3P_a034_vRegError	Regulator internal error	Regulator internal error observed	Reduced steering assist	No
EPAS3P_a033_vRegOutputOv	Gate drive voltage regulator overvoltage	Gate drive voltage regulator overvoltage	Reduced steering assist	No
EPAS3P_a032_vRegOutputUv	Gate drive voltage regulator undervoltage	Gate drive voltage regulator undervoltage	Reduced steering assist	No
EPAS3P_a031_abnormalShutdown	Shutdown sequence was interrupted, returned error or timed out	Unexpected shutdown sequence observed	Reduced steering assist	No
EPAS3P_a030_phaseWbootUv	Phase W bootstrap undervoltage	Phase W bootstrap undervoltage	Reduced steering assist	No
EPAS3P_a029_phaseVbootUv	Phase V bootstrap undervoltage	Phase V bootstrap undervoltage	Reduced steering assist	No
EPAS3P_a028_phaseUbootUv	Phase U bootstrap undervoltage	Phase U bootstrap undervoltage	Reduced steering assist	No