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.

35 codes

Body Control Actuator Hardware Fault

The central body control module has detected an electrical open or short circuit inside one of its physical electronic actuator loops. This typically stops minor comfort systems from functioning, such as automated vent flaps, electronic glovebox latches, or steering column adjusters.

Tesla

Body Controller Unexpected Wake State

The vehicle's primary body control network is failing to sleep when parked, staying stuck in an active state that draws continuous current. This internal logic bug prevents the vehicle from entering deep sleep mode, rapidly draining the low-voltage 12V auxiliary battery overnight.

Tesla, Rivian, Ford

Tesla Charge Port Power Conversion Failure

The Battery Management System has lost its high-voltage connection to the vehicle's onboard Power Conversion System (PCS). This safety-critical hardware error prevents the vehicle from accepting any AC home charging or managing DC fast-charging sessions safely.

Tesla

Degraded 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.

Nissan, Tesla

Onboard Charging System Hardware Fault

The Battery Management System cannot establish proper current control loops with the integrated internal AC onboard charger module. This prevents the vehicle from taking in standard alternating current from home wall boxes or public level 2 charging units.

Tesla, Kia, Hyundai

Internal Battery Pack Monitor Communication Loss

The Battery Management System dropped its data connection with an internal cell-monitoring circuit card inside the HV battery casing. Without real-time cell temperature and voltage data, the car caps charging and range to protect the pack from thermal runaway.

Tesla

BMS_u050Critical

Rapid Cell Impedance Imbalance Detected

The Battery Management System has flagged a dangerous, rapid spike in internal electrical resistance across an isolated group of battery cells. This severe cell delta limits regular acceleration power and blocks normal charging currents to eliminate thermal runaway risks.

Tesla

BRK_a024Warning

Regenerative 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

Brake 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.

Tesla, Nissan, Toyota

Regenerative 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

CHG_f034Warning

DC Fast Charging Performance Degraded

The vehicle has restricted DC fast-charging speeds due to an identified issue inside the fast-charging safety control line. While you can safely charge at standard rates using your home AC wall box, fast charging at public stations will run at deeply throttled speeds.

Tesla, Hyundai

Charge Port Latch Engagement Warning

The charge port controller is warning that the internal locking latch failed to clamp securely around the charging handle pin. Because high-voltage charging cannot safely begin without a locked handle, the vehicle will block power flow until a lock is achieved.

Tesla, Ford, Hyundai

Charge Port Door Sensor Communication Loss

The charge port control unit lost its digital connection with the push-to-open inductive sensor in the door flap. The push-to-open shortcut is disabled but the charge door still works via touchscreen, app, or charging cable button.

Tesla

DI_a023Critical

Inverter Gate Driver Circuit Fault

The drive inverter's internal logic card has tracked a critical hardware failure inside the transistor gate driver network. This component converts the high-voltage battery's DC power into the AC waveforms that spin your drive motors, meaning a fault here causes complete propulsion loss.

Tesla, Hyundai

Drive Unit Phase Current Fault

The motor control module has detected an irregular electrical wave mismatch across the three individual power phase cables running into the drive motor. This severe electrical deviation causes immediate limp-home modes or shuts down the drive unit to protect circuits from high-amp shorting.

Tesla, Ford

Drive 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.

Tesla, Nissan

DI_w014Warning

Drive Unit Mechanical Bearing Warning

The drive unit housing sensors have logged an anomalous structural signature or high thermal spike coming from the main internal rotor shaft bearing. This indicates internal mechanical wear that, if ignored, can damage the motor's core gear teeth.

Tesla, Ford

Media Control Unit Warning Active

The car's primary infotainment and Media Control Unit has logged a non-fatal internal logic glitch or high processor temperature loop. While the vehicle remains fully safe to drive, secondary convenience features like GPS tracking, sound systems, and camera feeds may lag or freeze.

Tesla, Ford

Infotainment MCU Screen Component Failure

The primary central dashboard touchscreen assembly has suffered an electrical component failure, causing a permanently blank screen, flashing backlights, or non-responsive touch inputs. Because vital climate settings and speedometer data can be tied to this screen, a failure here requires quick repair.

Tesla

MECH_DOOR_001Low

Flush Door Handle Failure To Actuate

The vehicle's aerodynamic flush-mount motorized exterior door handle assembly has encountered a mechanical breakdown or a broken link wire inside the door skin. The handle stays retracted inside the door body, blocking physical entry to the car.

Tesla

MECH_S3Y_001Warning

Front Suspension Squeak Control Arm Bushing

A highly prominent mechanical squeaking or creaking noise is heard from the front suspension when steering or driving over bumps. This is a common mechanical issue caused by water ingress washing out the grease inside the front upper control arm ball joints and rubber bushings.

Tesla

Door Handle Actuator Assembly Fault

The driver or passenger side automated door handle mechanism fails to present or extend outwards when the car unlatches. The internal motorized microswitches or cast paddle gears have cracked under cyclic fatigue stress, locking users out of the vehicle cabin.

Tesla

P0A0CCritical

Main High Voltage Battery Critical Fault

The vehicle's central interlock control system has logged an unacceptably low voltage or circuit break along the high-voltage safety loop line. This severe fault code acts as a master safety trigger, locking open the battery pack contactors and disabling the powertrain to avoid electrocution risks.

Tesla, Hyundai

EV Battery Cooling Fan Performance Fault

The vehicle control computer has detected an open circuit, low voltage draw, or complete hardware failure within the auxiliary electric fan network tasked with cooling the main battery pack array. Without this fan pushing air, battery cell temperatures can quickly climb during rapid charging sessions.

Tesla, Hyundai

High 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.

Nissan, Tesla, Fiat

EV Thermal Management System Control Error

The primary vehicle control computer has lost operation over the intricate network of electronic multi-way directional valves that route cooling fluid through the battery pack and powertrain. This leaves the car unable to cool its battery cells or warm its cabin, throwing the car into limp mode.

Tesla, Ford

EV 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

Charge Port Actuator Motor Jammed

The automated charge port door locking actuator pin mechanism has encountered a mechanical jam or internal motor electrical failure. The car cannot physically slide the metal security locking pin into the charging handle latch hook, preventing any high-power charging sessions from initiating.

Tesla, Hyundai

Powertrain Performance Control Logic Error

The central drive control processor has identified an internal processing computation variance across its motor acceleration tracking arrays. This discrepancy causes the vehicle to drop torque delivery and slip into a safe default power state to prevent unintended acceleration.

Tesla

THC_a102Critical

Battery 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.

Nissan, Tesla, Ford

Heat Pump Refrigerant System Failure

The advanced central climate heat pump system has entered a protective lock state due to an internal hardware breakdown, a failed electronic expansion valve, or low structural refrigerant pressure. The car cannot warm or cool its battery pack or passenger cabin spaces efficiently.

Tesla, Hyundai

THC_w021Warning

AC 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.

Tesla, Nissan, Volkswagen

THC_w044Warning

Battery Cooling Loop Low Performance

The vehicle's central thermal management module has identified insufficient heat dissipation across the main high-voltage battery cooling loop. The battery will struggle to shed heat during fast-charging sessions or sustained highway driving, leading to throttled charging speeds.

Tesla, Hyundai, Volkswagen

Over-The-Air Update System Internal Fault

The vehicle's main network gateway has logged a deep internal processing error or firmware file corruption during an attempted Over-The-Air (OTA) software update. This system hang-up can lock or disable specific vehicle modules, preventing the car from clearing old fault memories until the software is restored.

Tesla, Ford, Rivian

VCFRONT_a182High

Low Voltage Auxiliary Battery Replacement Required

The front vehicle controller has tracked severe capacity loss or a failing internal cell within the low-voltage auxiliary accessory battery. This battery runs the vehicle's secondary computers, lighting, and safety relays, meaning an unaddressed failure here can leave the car unable to unlock or power up.

Tesla