Hyundai OBD-II Trouble Codes

Meaning: Intake Camshaft Position Actuator Circuit/Open (Bank 1).
Common triggers/diagnostic areas: A sticking or failed intake oil control valve/CVVT solenoid, damaged wiring or connector terminals, contaminated or incorrect engine oil, restricted oil passages, or—less commonly—an ECM fault.

Meaning: Intake Camshaft Timing Over-Advanced or System Performance (Bank 1).
Common triggers/diagnostic areas: Low, dirty, or incorrect-viscosity engine oil; a sticking intake oil control valve; a restricted oil passage; a faulty CVVT actuator; incorrect mechanical timing; or a stretched timing chain.

Meaning: Intake Camshaft Timing Over-Retarded (Bank 1).
Common triggers/diagnostic areas: Low, dirty, or incorrect-viscosity engine oil; a sticking intake oil control valve; a restricted oil passage; a faulty CVVT actuator; incorrect mechanical timing; or a stretched timing chain.

Meaning: Exhaust Camshaft Position Actuator Circuit/Open (Bank 1).
Common triggers/diagnostic areas: A sticking or failed exhaust oil control valve/CVVT solenoid, damaged wiring or connector terminals, contaminated or incorrect engine oil, restricted oil passages, or—less commonly—an ECM fault.

Meaning: Exhaust Camshaft Timing Over-Advanced or System Performance (Bank 1).
Common triggers/diagnostic areas: Low, dirty, or incorrect-viscosity engine oil; a sticking exhaust oil control valve; a restricted oil passage; a faulty CVVT actuator; incorrect mechanical timing; or a stretched timing chain.

Meaning: Crankshaft Position–Camshaft Position Correlation (Bank 1, Sensor B/Exhaust).
Common triggers/diagnostic areas: Incorrect valve timing, a stretched or jumped timing chain, a damaged timing component or reluctor, a sticking exhaust CVVT actuator or oil control valve, low/contaminated oil, a camshaft or crankshaft position sensor circuit fault, or a model-specific ECM calibration issue.

Meaning: Fuel Rail/System Pressure Too Low.
Common triggers/diagnostic areas: Restricted fuel supply, low-pressure fuel pump or control problems, a restricted fuel feed tube/filter, a high-pressure fuel pump or pressure-control valve problem, excessive injector leakage, a fuel rail pressure sensor/circuit issue, or a model-specific ECM calibration concern.

Meaning: Charge Air Cooler Temperature Sensor Circuit, Bank 2.
Common triggers/diagnostic areas: A failed charge-air temperature sensor, an open/short/high-resistance sensor circuit, connector corrosion or damage, or a charge-air cooler/ducting problem. This code applies only to engines equipped with the relevant Bank 2 sensor.

Meaning: Turbocharger/Supercharger Boost Control “B” Module Performance.
Common triggers/diagnostic areas: A sticking or damaged Bank 2 turbo actuator, linkage or wastegate binding, actuator motor/position-sensor failure, wiring or connector damage, boost-control vacuum/pressure problems, or an ECM calibration issue. This code generally applies to multi-bank or multi-turbo applications.

Meaning: Mass or Volume Air Flow “A” Circuit Range/Performance.
Common triggers/diagnostic areas: A contaminated or faulty MAF sensor, an intake duct leak or restriction, PCV/vacuum leaks, incorrect air-filter installation, wiring/connector issues, or an ECM software/calibration concern.

Meaning: Mass or Volume Air Flow “A” Circuit Low Input.
Common triggers/diagnostic areas: An unplugged or failed MAF sensor, an open or short-to-ground circuit, damaged terminals/connectors, poor sensor power or ground, or severe intake-air restriction.

Meaning: Intake Air Temperature Sensor 1 Circuit High Input.
Common triggers/diagnostic areas: An unplugged sensor, an open signal or ground circuit, connector corrosion or damaged terminals, or a failed IAT sensor. On some Hyundai engines the IAT sensor is integrated into the MAF or MAP sensor.

Meaning: Coolant Thermostat—Coolant Temperature Below Regulating Temperature.
Common triggers/diagnostic areas: A thermostat stuck open, low coolant, trapped air, an engine coolant temperature sensor/circuit issue, excessive cooling-fan operation, or—on newer applications—an integrated thermal management component concern.

Meaning: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 1).
Common triggers/diagnostic areas: A failed upstream oxygen/air-fuel sensor heater, an open or shorted heater circuit, a blown fuse, poor power/ground, damaged connector terminals, or—less commonly—an ECM driver fault.

Meaning: System Too Lean (Bank 1).
Common triggers/diagnostic areas: Unmetered air from intake/PCV/vacuum leaks, a contaminated or biased MAF/MAP sensor, low fuel pressure, restricted or faulty injectors, an exhaust leak ahead of the upstream oxygen sensor, a biased oxygen/air-fuel sensor, or an ECM calibration issue.

Meaning: System Too Lean (Bank 2).
Common triggers/diagnostic areas: Unmetered air from intake/PCV/vacuum leaks, a contaminated or biased MAF/MAP sensor, low fuel pressure, restricted or faulty Bank 2 injectors, an exhaust leak ahead of the Bank 2 upstream oxygen sensor, or a biased oxygen/air-fuel sensor.

Meaning: Fuel Injector Circuit/Open.
Common triggers/diagnostic areas: An open/short in a shared injector circuit, poor injector power supply, damaged harness/connectors, one or more failed injectors, or an ECM injector-driver fault.

Meaning: Fuel Injector Circuit/Open—Cylinder 1.
Common triggers/diagnostic areas: A failed or restricted cylinder 1 injector, damaged wiring or connector terminals, poor injector power supply, or an ECM injector-driver fault.

Meaning: Fuel Injector Circuit/Open—Cylinder 2.
Common triggers/diagnostic areas: A failed or restricted cylinder 2 injector, damaged wiring or connector terminals, poor injector power supply, or an ECM injector-driver fault.

Meaning: Fuel Injector Circuit/Open—Cylinder 3.
Common triggers/diagnostic areas: A failed or restricted cylinder 3 injector, damaged wiring or connector terminals, poor injector power supply, or an ECM injector-driver fault.

Meaning: Fuel Injector Circuit/Open—Cylinder 5.
Common triggers/diagnostic areas: A failed or restricted cylinder 5 injector, damaged wiring or connector terminals, poor injector power supply, or an ECM injector-driver fault. This code applies only to Hyundai engines with at least five cylinders.

Meaning: Random/Multiple Cylinder Misfire Detected.
Common triggers/diagnostic areas: Worn or fouled spark plugs, failed ignition coils, injector or fuel-pressure problems, intake/vacuum leaks, incorrect valve timing, low compression or other mechanical engine damage, sensor/circuit faults affecting timing or fueling, or contaminated fuel.

Meaning: Cylinder 1 Misfire Detected.
Common triggers/diagnostic areas: A worn/fouled spark plug, failed ignition coil, injector or wiring problem, intake leak affecting cylinder 1, low compression, valve/mechanical damage, or incorrect valve timing.

Meaning: Cylinder 2 Misfire Detected.
Common triggers/diagnostic areas: A worn/fouled spark plug, failed ignition coil, injector or wiring problem, intake leak affecting cylinder 2, low compression, valve/mechanical damage, or incorrect valve timing.

Meaning: Cylinder 3 Misfire Detected.
Common triggers/diagnostic areas: A worn/fouled spark plug, failed ignition coil, injector or wiring problem, intake leak affecting cylinder 3, low compression, valve/mechanical damage, or incorrect valve timing.

Meaning: Cylinder 4 Misfire Detected.
Common triggers/diagnostic areas: A worn/fouled spark plug, failed ignition coil, injector or wiring problem, intake leak affecting cylinder 4, low compression, valve/mechanical damage, or incorrect valve timing.

Meaning: Exhaust Gas Recirculation Flow Insufficient Detected.
Common triggers/diagnostic areas: Carbon-restricted EGR passages, a sticking/failed EGR valve, a vacuum or EGR control-solenoid problem, damaged wiring/connectors, or inaccurate MAP/pressure/position feedback. Applicability varies by engine.

Meaning: Catalyst System Efficiency Below Threshold (Bank 1).
Common triggers/diagnostic areas: A deteriorated catalytic converter, exhaust leaks, a biased or slow upstream/downstream oxygen sensor, unresolved misfires, rich/lean operation, oil or coolant consumption, or incorrect sensor wiring. The code alone does not prove the converter is faulty.

Meaning: Catalyst System Efficiency Below Threshold (Bank 2).
Common triggers/diagnostic areas: A deteriorated Bank 2 catalytic converter, exhaust leaks, a biased or slow Bank 2 oxygen sensor, unresolved misfires, rich/lean operation, oil or coolant consumption, or incorrect sensor wiring. The code alone does not prove the converter is faulty.

Meaning: Evaporative Emission Control System Malfunction.
Common triggers/diagnostic areas: A loose/missing/damaged fuel cap, leaking EVAP hoses or seals, a damaged canister, a stuck purge or vent valve, a fuel-tank pressure sensor problem, or wiring/connector damage.

Meaning: Evaporative Emission System Incorrect Purge Flow.
Common triggers/diagnostic areas: A purge control valve stuck open or closed, restricted or disconnected vapor lines, a damaged canister, a vent valve problem, a fuel-tank pressure sensor issue, or wiring/connector damage.

Meaning: Evaporative Emission System Leak Detected—Small Leak.
Common triggers/diagnostic areas: A loose or damaged fuel cap, small cracks in EVAP hoses, leaking O-rings or seals, a purge/vent valve that does not seal, a damaged canister, or a fuel-tank/filler-neck leak.

Meaning: Evaporative Emission System Leak Detected—Large Leak.
Common triggers/diagnostic areas: A missing or loose fuel cap, a disconnected/torn vapor hose, a purge or vent valve stuck open, a damaged canister, a leaking fuel-tank module seal, filler neck, or fuel tank, or a leak-detection/fuel-tank pressure sensor issue.

Meaning: Evaporative Emission System Leak Detected—Very Small Leak; failure type 7A may be displayed as P04567A.
Common triggers/diagnostic areas: A fuel cap or capless-filler sealing issue, a pinhole EVAP hose leak, a purge or vent valve that does not fully seal, a canister or fuel-tank module seal leak, or a fuel-tank pressure/leak-detection system problem.

Meaning: Vehicle Speed Sensor “A” Malfunction.
Common triggers/diagnostic areas: A failed wheel/transmission speed sensor used for vehicle-speed data, damaged sensor wiring or reluctor/tone ring, poor connector contact, CAN communication problems, or a module fault.

Meaning: Vehicle Speed Sensor “A” Range/Performance.
Common triggers/diagnostic areas: An inaccurate/intermittent speed sensor signal, damaged reluctor/tone ring, incorrect tire size or wheel-speed mismatch, wiring/connector issues, CAN communication faults, or a module calibration problem.

Meaning: Idle Control System Malfunction.
Common triggers/diagnostic areas: Throttle-body carbon buildup, an electronic throttle or idle-air control problem (where equipped), intake/vacuum leaks, PCV system faults, damaged wiring/connectors, or an ECM adaptation/software issue.

Meaning: Idle Control System RPM Lower Than Expected.
Common triggers/diagnostic areas: Throttle-body deposits, restricted intake airflow, an electronic throttle/idle actuator problem, excessive engine load, a vacuum/PCV issue, low system voltage, or incorrect idle adaptation.

Meaning: Idle Control System RPM Higher Than Expected.
Common triggers/diagnostic areas: An intake or PCV vacuum leak, throttle plate deposits or binding, an electronic throttle/idle actuator problem, incorrect throttle adaptation, or an accessory/load input fault.

Meaning: Serial Communication Link Malfunction.
Common triggers/diagnostic areas: An open/short or high resistance in a communication circuit, poor module power/ground, connector corrosion, a failed control module, or network interference.

Meaning: Internal Control Module Memory Check Sum Error.
Common triggers/diagnostic areas: Low or unstable voltage, poor ECM power/ground, corrupted programming, water/heat damage, or an internal ECM fault.

Meaning: Control Module Programming Error.
Common triggers/diagnostic areas: Incorrect, incomplete, or corrupted ECM/PCM programming; low voltage during reprogramming; an incompatible replacement module; or an internal module fault.

Meaning: Internal Control Module Keep Alive Memory Error.
Common triggers/diagnostic areas: A weak/disconnected 12-volt battery, intermittent ECM power or ground, a blown fuse/relay issue, connector problems, or an internal ECM memory fault.

Meaning: Internal Control Module Read Only Memory Error.
Common triggers/diagnostic areas: Low or unstable voltage, poor ECM power/ground, corrupted software, water/heat damage, or an internal ECM fault.

Meaning: Transmission Control System Malfunction/MIL Request.
Common triggers/diagnostic areas: The TCM has stored one or more transmission-specific codes. P0700 is an information code; diagnose the accompanying TCM codes rather than replacing parts based on P0700 alone.

Meaning: Transmission Range Sensor “A” Circuit (PRNDL Input).
Common triggers/diagnostic areas: A failed or misadjusted transmission range/inhibitor switch, damaged wiring/connectors, shift-cable/linkage misadjustment, poor module power/ground, or a TCM fault.

Meaning: Transmission Range Sensor “A” Circuit Range/Performance.
Common triggers/diagnostic areas: A misadjusted or failing range/inhibitor switch, shift linkage/cable problems, intermittent wiring/connectors, internal manual-valve alignment issues, or a TCM calibration/fault.

Meaning: Output Speed Sensor Circuit Malfunction.
Common triggers/diagnostic areas: A failed output speed sensor, damaged wiring/connectors, a damaged reluctor, metal debris or internal transmission damage, or a TCM fault.

Meaning: Incorrect Gear Ratio.
Common triggers/diagnostic areas: Low/incorrect/contaminated transmission fluid, hydraulic pressure loss, valve-body or solenoid problems, slipping clutches, internal transmission damage, speed-sensor errors, or a TCM calibration issue.

Meaning: Transmission Fluid Pressure Sensor/Switch “A” Circuit Range/Performance.
Common triggers/diagnostic areas: Incorrect fluid level or condition, hydraulic pressure problems, a faulty pressure sensor/switch, valve-body restrictions, wiring/connector damage, or a TCM fault.

Meaning: Transmission Fluid Pressure Sensor/Switch “A” Circuit Low.
Common triggers/diagnostic areas: A short-to-ground/open power circuit, a failed pressure sensor, low hydraulic pressure, connector corrosion, or a TCM fault.

Meaning: Transmission Fluid Pressure Sensor/Switch “B” Circuit.
Common triggers/diagnostic areas: A faulty pressure sensor/switch, damaged wiring/connectors, incorrect fluid level or condition, hydraulic/valve-body problems, or a TCM fault.

Meaning: Transmission Fluid Pressure Sensor/Switch “B” Circuit Range/Performance.
Common triggers/diagnostic areas: Incorrect fluid level or condition, hydraulic pressure problems, a faulty pressure sensor/switch, valve-body restrictions, wiring/connector damage, or a TCM fault.

Meaning: Transmission Fluid Pressure Sensor/Switch “B” Circuit Low.
Common triggers/diagnostic areas: A short-to-ground/open power circuit, a failed pressure sensor, low hydraulic pressure, connector corrosion, or a TCM fault.

Meaning: Clutch Actuator Circuit Range/Performance.
Common triggers/diagnostic areas: A clutch actuator motor/solenoid problem, actuator position sensor fault, clutch mechanism binding or wear, damaged wiring/connectors, low system voltage, or a TCM issue. Common on applicable DCT/automated-manual systems.

Meaning: Hydraulic Pressure Sensor Circuit High.
Common triggers/diagnostic areas: A short-to-voltage, open ground, failed hydraulic pressure sensor, connector/wiring damage, abnormal hydraulic pressure, or a TCM fault.

Meaning: Hydraulic Pressure Unit.
Common triggers/diagnostic areas: Low/incorrect fluid, a hydraulic pump or accumulator problem, valve-body leakage/restriction, pressure sensor errors, damaged wiring/connectors, or a TCM fault.

Meaning: Hydraulic Pressure Unit Loss of Pressure.
Common triggers/diagnostic areas: Low fluid, fluid leakage, a restricted filter, a failing transmission oil pump, valve-body/internal leakage, a pressure sensor issue, or wiring/TCM faults.

Meaning: DC/DC Converter Status Circuit.
Common triggers/diagnostic areas: A DC/DC converter or inverter/converter fault, low or unstable 12-volt system voltage, a blown fuse/fusible link, damaged status-circuit wiring/connectors, poor grounds, or a hybrid control module fault.

Meaning: High Voltage System Interlock Circuit High.
Common triggers/diagnostic areas: An incompletely seated service disconnect, an open safety-interlock loop, a loose inverter/battery cover or high-voltage connector, damaged interlock wiring, connector corrosion, or a hybrid control module fault.

Meaning: Engine Failed to Start.
Common triggers/diagnostic areas: A conventional engine no-start condition (fuel, ignition, compression, timing or sensor issue), insufficient high-voltage battery state of charge, a hybrid starter-generator/transaxle problem, or hybrid control software/module faults.

Meaning: Hybrid Battery Pack Deterioration.
Common triggers/diagnostic areas: High-voltage battery capacity loss or cell imbalance, abnormal temperature, poor battery connections, a battery cooling problem, voltage-sense circuit issues, or a battery management module fault.

Meaning: Replace Hybrid/EV Battery Pack.
Common triggers/diagnostic areas: One or more weak or imbalanced battery modules/cells, excessive internal resistance, battery cooling problems, voltage-sense harness faults, or battery management system issues. Hyundai GDS data is required before condemning the battery assembly.

Meaning: Hybrid/EV Battery Pack Voltage Sense “D” Circuit Intermittent/Erratic.
Common triggers/diagnostic areas: An intermittent/open/shorted voltage-sense circuit, loose or corroded battery/BMS connectors, damaged sense wiring, a failed sensing board/module, or an internal battery pack issue.

Meaning: Hybrid/EV Battery “A” Voltage Unstable.
Common triggers/diagnostic areas: Cell/module imbalance, loose high-voltage or sense connections, a voltage-sense/BMS fault, abnormal battery temperature, or an internal battery pack problem.

Meaning: Hybrid/EV Battery “A” Voltage High.
Common triggers/diagnostic areas: Overvoltage in the monitored battery section, a voltage-sense circuit fault, connector/wiring damage, charging-control problems, or a BMS/internal battery issue.

Meaning: Hybrid/EV Battery “B” Voltage Unstable.
Common triggers/diagnostic areas: Cell/module imbalance, loose high-voltage or sense connections, a voltage-sense/BMS fault, abnormal battery temperature, or an internal battery pack problem.

Meaning: Hybrid/EV Battery “D” Voltage Unstable.
Common triggers/diagnostic areas: Cell/module imbalance, loose high-voltage or sense connections, a voltage-sense/BMS fault, abnormal battery temperature, or an internal battery pack problem.

Meaning: Drive Motor “A” Current Low.
Common triggers/diagnostic areas: A drive-motor phase/current-sensor circuit problem, inverter fault, damaged high-voltage cables/connectors, poor motor connection, or an internal drive-motor fault.

Meaning: Drive Motor “B” Phase U-V-W Circuit Low.
Common triggers/diagnostic areas: A short/open or high resistance in a motor phase circuit, damaged high-voltage connectors/cables, an inverter power-stage fault, or an internal drive-motor winding problem.

Meaning: Drive Motor “A” Inverter Phase U Over Temperature.
Common triggers/diagnostic areas: Inverter cooling-system problems, low coolant or air in the circuit, an electric coolant pump/fan fault, restricted coolant flow, a temperature-sensor circuit issue, excessive electrical load, or an inverter fault.

Meaning: Drive Motor “B” Inverter Phase U Over Temperature.
Common triggers/diagnostic areas: Inverter cooling-system problems, low coolant or air in the circuit, an electric coolant pump/fan fault, restricted coolant flow, a temperature-sensor circuit issue, excessive electrical load, or an inverter fault.

Meaning: Drive Motor “B” Inverter Phase V Over Temperature.
Common triggers/diagnostic areas: Inverter cooling-system problems, low coolant or air in the circuit, an electric coolant pump/fan fault, restricted coolant flow, a temperature-sensor circuit issue, excessive electrical load, or an inverter fault.

Meaning: Knock Sensor Detection System (KSDS)—Abnormal Engine Vibration/Knock Signal.
Common triggers/diagnostic areas: On affected Hyundai engines, KSDS may detect vibration associated with connecting-rod bearing wear and place the vehicle in reduced-power protection mode. Other possibilities include a knock-sensor/wiring issue or required ECM software. Hyundai campaign/TSB procedures and GDS bearing-clearance inspection must be followed; do not clear the code and continue driving without diagnosis.

Meaning: NOx Adsorber Efficiency Below Threshold (Bank 1).
Common triggers/diagnostic areas: A deteriorated NOx storage catalyst, exhaust leaks, biased NOx/oxygen/temperature sensors, incorrect fuel control or regeneration, sulfur contamination, or related wiring/module faults. This is not the same as a DPF-efficiency code.

Meaning: Diesel Particulate Filter Efficiency Below Threshold (Bank 1).
Common triggers/diagnostic areas: An overloaded, damaged, or ash-filled DPF; failed regeneration; exhaust leaks; biased differential-pressure or exhaust-temperature sensors; sensor hose restrictions; injector/airflow issues; or ECM calibration concerns.

Meaning: Intake Manifold Runner Control Stuck Open (Bank 1).
Common triggers/diagnostic areas: A sticking runner flap/linkage, failed actuator or position sensor, vacuum/control-solenoid problems, carbon buildup, damaged wiring/connectors, or an intake manifold fault.

Meaning: Intake Manifold Runner Control Stuck Closed (Bank 1).
Common triggers/diagnostic areas: A sticking runner flap/linkage, failed actuator or position sensor, vacuum/control-solenoid problems, carbon buildup, damaged wiring/connectors, or an intake manifold fault.

Meaning: Throttle Actuator “A” Control Motor Circuit Range/Performance.
Common triggers/diagnostic areas: Throttle-body deposits or binding, a failed throttle actuator motor, damaged wiring/connectors, low voltage, throttle-position sensor disagreement, or an ECM fault/adaptation issue.

Meaning: Throttle/Pedal Position Sensor/Switch “D” Circuit Low Input.
Common triggers/diagnostic areas: A failed accelerator-pedal or throttle-position sensor channel, short-to-ground/open reference circuit, poor connector contact, damaged wiring, or an ECM fault.

Meaning: Throttle/Pedal Position Sensor/Switch “A”/“B” Voltage Correlation.
Common triggers/diagnostic areas: A failed electronic throttle body/TPS, sensor track disagreement, connector or harness damage, poor 5-volt reference/ground, throttle plate binding, or an ECM fault.

Meaning: Throttle/Pedal Position Sensor/Switch “D”/“E” Voltage Correlation.
Common triggers/diagnostic areas: A failed accelerator-pedal position sensor assembly, sensor track disagreement, connector or harness damage, poor 5-volt reference/ground, or an ECM fault.

Meaning: System Too Rich Off Idle (Bank 2).
Common triggers/diagnostic areas: A leaking/stuck Bank 2 injector, excessive fuel pressure, contaminated or biased MAF/MAP data, a biased Bank 2 oxygen/air-fuel sensor, restricted intake airflow, EVAP purge flow at the wrong time, or engine mechanical issues. Applies only to engines with Bank 2.

Meaning: Cooling System Performance.
Common triggers/diagnostic areas: A faulty thermostat or integrated thermal management module, low coolant or trapped air, an engine coolant temperature sensor/circuit issue, coolant pump or flow restriction, cooling-fan control problems, or a model-specific ECU calibration concern.

Meaning: NOx Sensor Heater Sense Circuit Low (Bank 1).
Common triggers/diagnostic areas: A failed NOx sensor/heater, short-to-ground or open power supply, blown fuse, damaged wiring/connectors, poor ground, or a control-module fault. Primarily applicable to diesel/SCR-equipped vehicles.

Meaning: NOx Sensor Circuit (Bank 2).
Common triggers/diagnostic areas: A failed Bank 2 NOx sensor, exhaust leaks, damaged wiring/connectors, incorrect sensor power/ground, SCR/aftertreatment problems, or a control-module fault. Applies only to systems equipped with Bank 2 monitoring.

Meaning: Oxygen Sensor Positive Current Control Circuit/Open (Bank 1, Sensor 1).
Common triggers/diagnostic areas: A failed wideband air-fuel/oxygen sensor, an open pump-current circuit, damaged wiring/connectors, poor sensor power/ground, exhaust leaks, or an ECM fault.

Meaning: Oxygen Sensor Positive Current Control Circuit Low (Bank 1, Sensor 1).
Common triggers/diagnostic areas: A failed wideband air-fuel/oxygen sensor, a short-to-ground in the pump-current circuit, damaged wiring/connectors, poor sensor power/ground, or an ECM fault.

Meaning: Oxygen Sensor Negative Current Control Circuit/Open (Bank 1, Sensor 1).
Common triggers/diagnostic areas: A failed wideband air-fuel/oxygen sensor, an open current-control circuit, damaged wiring/connectors, poor sensor power/ground, or an ECM fault.

Meaning: Ignition Coil “A” Secondary Circuit.
Common triggers/diagnostic areas: A failed cylinder 1 ignition coil, worn/fouled spark plug, excessive plug gap, damaged coil boot, moisture/oil in the plug well, poor coil connection, or an ECM driver issue.

Meaning: Ignition Coil “B” Primary Control Circuit Low.
Common triggers/diagnostic areas: A short-to-ground, failed cylinder 2 ignition coil, damaged wiring/connectors, poor power supply, or an ECM ignition-driver fault.

Meaning: Ignition Coil “B” Secondary Circuit.
Common triggers/diagnostic areas: A failed cylinder 2 ignition coil, worn/fouled spark plug, excessive plug gap, damaged coil boot, moisture/oil in the plug well, poor coil connection, or an ECM driver issue.

Meaning: Ignition Coil “C” Secondary Circuit.
Common triggers/diagnostic areas: A failed cylinder 3 ignition coil, worn/fouled spark plug, excessive plug gap, damaged coil boot, moisture/oil in the plug well, poor coil connection, or an ECM driver issue.

Meaning: Ignition Coil “D” Primary Control Circuit High.
Common triggers/diagnostic areas: An open/short-to-voltage control circuit, failed cylinder 4 ignition coil, damaged wiring/connectors, poor ground, or an ECM ignition-driver fault.

Meaning: Evaporative Emission System Leak Detection Pump Control Circuit Low.
Common triggers/diagnostic areas: A failed leak-detection pump, short-to-ground/open power supply, blown fuse, damaged wiring/connectors, poor ground, or an ECM driver fault.

Meaning: Evaporative Emission System Leak Detection Pump Control Circuit High.
Common triggers/diagnostic areas: A failed leak-detection pump, short-to-voltage/open ground, damaged wiring/connectors, or an ECM driver fault.

Meaning: Evaporative Emission System Vent Valve Stuck Closed.
Common triggers/diagnostic areas: A stuck/blocked canister close or vent valve, saturated/damaged charcoal canister, restricted vent filter/line, damaged wiring/connectors, or an ECM control issue.

Meaning: Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 1).
Common triggers/diagnostic areas: A failed pressure sensor, air pump or switching valve problem, restricted/leaking hoses, water intrusion, damaged wiring/connectors, or a control-module fault.

Meaning: Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low (Bank 1).
Common triggers/diagnostic areas: A failed pressure sensor, short-to-ground/open reference circuit, connector corrosion or water intrusion, damaged wiring, or a control-module fault.

Meaning: Generator Lamp/L-Terminal Circuit Low.
Common triggers/diagnostic areas: An alternator/generator or internal regulator fault, short-to-ground/open power circuit, damaged wiring/connectors, weak battery, blown fuse/fusible link, or an ECM/charging-control fault.

Meaning: Generator Lamp/L-Terminal Circuit High.
Common triggers/diagnostic areas: An alternator/generator or internal regulator fault, short-to-voltage/open ground, damaged wiring/connectors, weak battery, or an ECM/charging-control fault.

Meaning: Charging System Voltage Low.
Common triggers/diagnostic areas: A weak battery, failing alternator/generator or DC/DC converter, loose/slipping belt where applicable, high-resistance battery cables/grounds, blown fuse/fusible link, or excessive electrical load.

Meaning: ECM/PCM Power Input Signal Intermittent.
Common triggers/diagnostic areas: A weak battery, loose/corroded battery terminals, intermittent ECM relay/fuse, poor ECM power or ground, damaged wiring/connectors, or an internal module fault.

Meaning: Engine Oil Level Sensor Circuit Low.
Common triggers/diagnostic areas: A failed oil-level sensor, low oil level where the sensor is capable of detecting it, short-to-ground/open reference or power circuit, connector contamination, damaged wiring, or an ECM fault.

Meaning: Coolant Pump “A” Control Circuit Range/Performance.
Common triggers/diagnostic areas: A failed electric coolant pump, restricted coolant flow, low coolant/air in the system, pump relay/fuse or power/ground problems, damaged wiring/connectors, or an ECM/hybrid control fault.

Meaning: Intake Air Heater “B” Circuit Low.
Common triggers/diagnostic areas: A failed intake-air heater, short-to-ground/open power supply, blown fuse/relay, damaged wiring/connectors, poor ground, or an ECM driver fault. Primarily applicable to diesel engines.

Meaning: Intake Air Heater System Performance.
Common triggers/diagnostic areas: A failed intake-air heater or relay, high-resistance wiring, inadequate power/ground, temperature-sensor input problems, or an ECM control issue. Primarily applicable to diesel engines.

Meaning: ECM/PCM Internal Engine Off Timer Performance.
Common triggers/diagnostic areas: Low/interrupted battery voltage, poor ECM power/ground, an ignition-switch or relay issue, incorrect module programming, or an internal ECM timer fault.

Meaning: Camshaft Position Signal Output Circuit/Open.
Common triggers/diagnostic areas: An open/shorted camshaft-position signal output circuit, damaged wiring/connectors, poor module power/ground, a related camshaft sensor signal problem, or an ECM fault.

Meaning: Shift Solenoid “F” Malfunction.
Common triggers/diagnostic areas: A failed or sticking shift solenoid F, damaged wiring/connectors, contaminated/incorrect fluid, valve-body restriction, hydraulic pressure problems, or a TCM fault.

Meaning: Unexpected Mechanical Gear Disengagement.
Common triggers/diagnostic areas: Low/incorrect fluid, clutch slip or internal transmission wear, valve-body/hydraulic pressure problems, speed-sensor errors, solenoid faults, or a TCM calibration issue.

Meaning: Pressure Control Solenoid “D” Performance/Stuck Off.
Common triggers/diagnostic areas: A sticking/failed solenoid D, valve-body restriction, contaminated/incorrect fluid, low hydraulic pressure, damaged wiring/connectors, or a TCM fault.

Meaning: Pressure Control Solenoid “D” Electrical.
Common triggers/diagnostic areas: An open/shorted solenoid D circuit, failed solenoid coil, damaged wiring/connectors, poor TCM power/ground, or a TCM driver fault.

Meaning: Pressure Control Solenoid “E” Performance/Stuck Off.
Common triggers/diagnostic areas: A sticking/failed solenoid E, valve-body restriction, contaminated/incorrect fluid, low hydraulic pressure, damaged wiring/connectors, or a TCM fault.

Meaning: Transmission Range Sensor “B” Circuit High.
Common triggers/diagnostic areas: A short-to-voltage/open ground, a failed or misadjusted range sensor, damaged wiring/connectors, shift-linkage problems, or a TCM fault.

Meaning: Transmission Range Sensor Alignment.
Common triggers/diagnostic areas: A misadjusted range sensor/inhibitor switch or shift cable, linkage/manual-valve alignment problems, damaged mounting components, or sensor/TCM faults.

Meaning: Pressure Control Solenoid “G” Stuck On.
Common triggers/diagnostic areas: A sticking/failed solenoid G, valve-body restriction, contaminated/incorrect fluid, excessive hydraulic pressure, damaged wiring/connectors, or a TCM fault.

Meaning: Pressure Control Solenoid “G” Electrical.
Common triggers/diagnostic areas: An open/shorted solenoid G circuit, failed solenoid coil, damaged wiring/connectors, poor TCM power/ground, or a TCM driver fault.

Meaning: Pressure Control Solenoid “G” Control Circuit High.
Common triggers/diagnostic areas: A short-to-voltage/open ground in the solenoid G control circuit, failed solenoid/valve-body assembly, damaged wiring/connectors, or a TCM driver fault.

Meaning: Oxygen Sensor Circuit Range/Performance (Bank 1, Sensor 1).
Common triggers/diagnostic areas: A biased or slow upstream oxygen/air-fuel sensor, exhaust or intake leaks, sensor contamination, fuel-pressure or injector problems, damaged wiring/connectors, or an ECM calibration/fault.

Meaning: Oxygen Sensor Circuit Range/Performance (Bank 1, Sensor 2).
Common triggers/diagnostic areas: A biased or slow downstream oxygen sensor, exhaust leaks, catalyst-related problems, sensor contamination, damaged wiring/connectors, or an ECM fault.

Meaning: Oxygen Sensor Circuit Range/Performance (Bank 2, Sensor 1).
Common triggers/diagnostic areas: A biased or slow Bank 2 upstream oxygen/air-fuel sensor, exhaust or intake leaks, sensor contamination, fuel-pressure or injector problems, damaged wiring/connectors, or an ECM fault.

Meaning: Oxygen Sensor Circuit Range/Performance (Bank 2, Sensor 2).
Common triggers/diagnostic areas: A biased or slow Bank 2 downstream oxygen sensor, exhaust leaks, catalyst-related problems, sensor contamination, damaged wiring/connectors, or an ECM fault.

Meaning: NOx Exceedance—Interruption of Reagent Dosing Activity.
Common triggers/diagnostic areas: Low, contaminated, frozen, or incorrect DEF/reductant; a dosing pump/injector or heater fault; NOx sensor errors; SCR catalyst performance problems; exhaust leaks; or related wiring/module faults. Primarily applicable to diesel SCR systems.

Meaning: Manufacturer-Specific Powertrain Code—Hyundai Definition Is Model/Module Dependent.
Common triggers/diagnostic areas: P3000 is not a universal Hyundai OBD-II definition. Some generic databases assign hybrid-battery meanings from other manufacturers. Confirm the reporting module, full subcode, vehicle model/year, and Hyundai GDS service information before publishing a component diagnosis.

Meaning: Manufacturer-Specific Powertrain Code—Hyundai Definition Is Model/Module Dependent.
Common triggers/diagnostic areas: P3100 is not a universal Hyundai OBD-II definition. Do not automatically label it a high-voltage control-module failure; confirm the reporting module, full subcode, vehicle model/year, and Hyundai GDS service information.

Meaning: Cylinder Deactivation System (Bank 1).
Common triggers/diagnostic areas: Low/incorrect engine oil, inadequate oil pressure, a failed cylinder-deactivation oil control solenoid, restricted oil passages, damaged wiring/connectors, mechanical valvetrain problems, or an ECM fault. Only applies to engines equipped with cylinder deactivation.

Meaning: Cylinder 1 Deactivation/Intake Valve Control Circuit/Open.
Common triggers/diagnostic areas: A failed cylinder 1 deactivation/intake valve control solenoid, open/shorted wiring, poor connector contact, low oil pressure or restricted oil passages, valvetrain problems, or an ECM fault.

Meaning: Body/SRS Code—Exact Hyundai Definition Requires the Full Subcode and Model.
Common triggers/diagnostic areas: This is not a universal powertrain OBD-II code. Depending on the Hyundai SRS system and subcode, it may relate to an occupant/seat-belt/restraint input or deployment circuit. Use Hyundai GDS and the model-specific SRS manual; never probe airbag circuits with a standard test light or ohmmeter.

Meaning: Chassis/ABS Code—Often Associated With the Right-Front Wheel-Speed Sensor Circuit, but Hyundai Definition Is Model/Subcode Dependent.
Common triggers/diagnostic areas: A failed wheel-speed sensor, damaged sensor wiring/connectors, a damaged or contaminated tone/encoder ring, excessive wheel-bearing play, incorrect air gap, low voltage, or an ABS/ESC module fault.

Meaning: High Speed CAN Communication Bus.
Common triggers/diagnostic areas: An open/short or high resistance in CAN-H/CAN-L wiring, connector corrosion or water intrusion, poor module power/ground, a module pulling the network down, incorrect termination resistance, or network wiring damage.

Meaning: Control Module Communication Bus “A” Off.
Common triggers/diagnostic areas: A CAN bus open/short, low system voltage, poor control-module power/ground, connector corrosion/water intrusion, or a failed module disrupting the network.

Meaning: Lost Communication With ECM/PCM “A”.
Common triggers/diagnostic areas: Low battery voltage, loss of ECM power/ground, a blown fuse or failed relay, CAN wiring/connector damage, network interference, or an ECM/internal module fault.

Meaning: Lost Communication With Throttle Actuator Control Module.
Common triggers/diagnostic areas: Low voltage, loss of throttle control module power/ground, CAN wiring/connector damage, an electronic throttle body/module fault, or another module disrupting communication. Architecture varies by Hyundai model.

Meaning: Lost Communication With Anti-Lock Brake System (ABS) Control Module.
Common triggers/diagnostic areas: Low battery voltage, loss of ABS/ESC module power or ground, a blown fuse, CAN wiring/connector damage, water intrusion, or an ABS/ESC module fault.