Hyundai Check Engine Codes

Every Hyundai uses the same generic OBD2 codes as other vehicles. These are the most common ones Hyundai owners see, with plain-English causes and fixes.

Most common codes for Hyundai drivers

Catalyst System Efficiency Below Threshold (Bank 1)

System Too Lean (Bank 1)

Random/Multiple Cylinder Misfire Detected

Evaporative Emission System Leak Detected (Very Small Leak)

Catalyst System Efficiency Below Threshold (Bank 2)

Coolant Thermostat (Coolant Temperature Below Regulating Temperature)

Evaporative Emission Control System Leak Detected (Large Leak)

System Too Lean (Bank 2)

Evaporative Emission Control System Leak Detected (Small Leak)

Intake Air Temperature (IAT) Sensor Circuit High Input

Cylinder 1 Misfire Detected

Cylinder 2 Misfire Detected

Hyundai-specific code guides

What each code usually means on a Hyundai, which models report it most, and what the repair costs.

"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

Mass or Volume Air Flow (MAF) Sensor Circuit Range/Performance

Mass Air Flow Sensor Circuit Low

Manifold Absolute Pressure Sensor Range/Performance

Manifold Absolute Pressure Sensor Circuit High

Intake Air Temperature (IAT) Sensor Circuit High Input

Engine Coolant Temperature Circuit Low Input

Engine Coolant Temperature Circuit High Input

Throttle Position Sensor/Switch Circuit Range/Performance

Coolant Thermostat (Coolant Temperature Below Regulating Temperature)

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

System Too Lean (Bank 1)

System Too Rich (Bank 1)

System Too Lean (Bank 2)

System Too Rich (Bank 2)

Random/Multiple Cylinder Misfire Detected

Cylinder 1 Misfire Detected

Cylinder 2 Misfire Detected

Cylinder 3 Misfire Detected

Cylinder 4 Misfire Detected

Cylinder 5 Misfire Detected

Cylinder 6 Misfire Detected

Knock Sensor 1 Circuit Malfunction (Bank 1)

Crankshaft Position Sensor Circuit Malfunction

Camshaft Position Sensor Circuit Malfunction

Camshaft Position Sensor A Circuit Range/Performance

Exhaust Gas Recirculation (EGR) Flow Insufficient Detected

Catalyst System Efficiency Below Threshold (Bank 1)

Catalyst System Efficiency Below Threshold (Bank 2)

Evaporative Emission Control System Malfunction

Evaporative Emission Control System Incorrect Purge Flow

Evaporative Emission Control System Leak Detected (Small Leak)

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

Evaporative Emission Control System Vent Control Circuit Malfunction

Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

Evaporative Emission Control System Pressure Sensor Range/Performance

Evaporative Emission Control System Leak Detected (Large Leak)

Evaporative Emission System Leak Detected (Very Small Leak)

Fuel Level Sensor Circuit High Input

Idle Air Control System RPM Higher Than Expected

Engine Oil Pressure Sensor/Switch Range/Performance

System Voltage Low

Transmission Control System Malfunction

Torque Converter Clutch Circuit Performance or Stuck Off

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