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_a066HighDegraded High Voltage Battery Modules
The high-voltage pack management module has mapped severe, irreversible capacity loss across specific internal battery cells. This means the affected cells are unable to safely accept standard current loads, heavily truncating full driving range and forcing the car into a permanent state of reduced performance.
Shop RequiredNissan, Tesla
BRK_a024WarningRegenerative Braking Control Fault Active
The vehicle's braking controller has logged an electrical fault that restricts or completely turns off regenerative braking. Because kinetic energy can no longer be converted back into battery charge, the vehicle relies solely on its mechanical friction brakes, altering brake pedal feel.
Tesla, Nissan, Chevrolet
C1210WarningBrake Fluid Level Sensor Fault
The electronic brake controller has picked up an erratic or out-of-spec voltage signal from the fluid level switch on the brake master cylinder reservoir. This triggers immediate safety warnings on your dashboard because the car cannot verify if it has adequate brake fluid pressure.
Shop RequiredTesla, Nissan, Toyota
C123CWarningRegenerative Braking Circuit Performance Error
The electronic stability and braking network has detected an electrical discrepancy inside the isolation valve circuit assigned to regenerative deceleration blending. This breaks coordination between electronic motor braking and hydraulic friction stop loops.
Tesla, Nissan
DI_a134HighDrive Inverter Fault Turtle Mode Active
A severe software or internal thermal fault inside the drive inverter assembly has forced the car into emergency Turtle Mode. Maximum driving speed and motor acceleration are heavily limited to protect the drive system from permanent electrical breakdown.
Shop RequiredTesla, Nissan
P0A7FHighHigh Voltage Battery Pack Severe Deterioration
The powertrain control module has determined that the high-voltage lithium traction battery pack has degraded past an acceptable engineering limit. The battery's internal chemical cells can no longer sustain proper high-current output, heavily capping available vehicle acceleration and total driving range.
Shop RequiredNissan, Tesla, Fiat
P0D22WarningEV Charging Current Sensor Circuit Fault
The onboard charging control module has logged an erratic or completely absent voltage signal from the high-voltage direct-current charging sensor. Because the vehicle cannot accurately track how many amps are pouring into the battery pack, it halts charging to prevent overcharging cells.
Nissan, Tesla
THC_a102CriticalBattery Thermal Excursion Safety Limit Reached
The thermal control framework has tracked extreme, dangerous peak temperature numbers within the main high-voltage battery array blocks. The car will lock open safety contactor blocks and stop all driving or high-power fast charging loops to eliminate battery fires.
Shop RequiredNissan, Tesla, Ford
THC_w021WarningAC Compressor Low Efficiency Warning
The vehicle's high-voltage electric air conditioning compressor is underperforming, failing to create appropriate refrigerant pressure levels while running at full rotational speeds. This warning flags a failing compressor pump component before it completely breaks down and clogs the cooling loops with metal dust.
Shop RequiredTesla, Nissan, Volkswagen