Fault Code Database
EV DTC Code Library
Browse diagnostic trouble codes for every major EV platform. Click any code to start the step-by-step repair wizard.
BMS_a063HighBattery Management System — Pack Voltage Imbalance
The BMS detected a voltage imbalance between cells or modules exceeding the safe operating threshold.
BMS_u029HighBattery Management System — Cell Overvoltage
The BMS detected one or more cells exceeding the maximum allowable voltage during charging or regenerative braking. This can indicate cell imbalance, BMS calibration drift, or a failing cell.
C1241MediumLow Battery Positive Voltage — 12V Auxiliary Battery
The ABS/VSCM or body control module detected that 12V supply voltage is below the minimum threshold required for safe ABS, stability control, and module communication operation.
CP_a051MediumCharge Port Latch Fault
The charge port latch actuator has reported an unexpected state — the latch may be stuck open, stuck closed, or unable to reach its commanded position.
P0A80HighHybrid Battery Pack Deterioration
The HV battery pack has deteriorated beyond acceptable capacity or internal resistance limits as measured by the Battery ECU.
P0C73HighElectric Motor A — Position Sensor Circuit Malfunction
The Motor Control Unit (MCU) detected an out-of-range or erratic signal from the Electric Motor A resolver or Hall-effect position sensor, impairing torque control accuracy.
P0D59MediumElectric Drive Motor Battery Pack System Performance
The Battery Management System (BMS) detected that the traction battery is not performing within the expected state of health (SOH) range, which may manifest as reduced range, reduced max power, or degraded regenerative braking.
P1A10CriticalTraction Battery Fault — Isolation Loss
The Battery Energy Control Module (BECM) detected a loss of electrical isolation between the high-voltage traction battery and vehicle chassis, which may indicate insulation degradation or coolant intrusion.
P1B0EHighTraction Inverter — Phase Current Sensor Fault
The Motor Control Unit (MCU) detected an out-of-range or inconsistent reading from one or more phase current sensors in the traction inverter. This can cause reduced motor output or protective shutdown.
U0100HighLost Communication with ECM/PCM
The Body Control Module (BCM) or another control module has lost communication with the Engine Control Module (ECM) or Propulsion Control Module (PCM) over the CAN bus.