What does my code mean?

Air intake

• P0101Mass or Volume Air Flow Circuit Range/Performance Drive with caution
• P0102Mass or Volume Air Flow 'A' Circuit Low Drive with caution

Catalytic converter

• P0420Catalyst System Efficiency Below Threshold (Bank 1) Usually OK to drive
• P0430Catalyst System Efficiency Below Threshold (Bank 2) Usually OK to drive

Cooling

• P0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Usually OK to drive

EGR

• P0401Exhaust Gas Recirculation Flow Insufficient Detected Drive with caution

EVAP (fuel vapour)

• P0440Evaporative Emission System Malfunction Usually OK to drive
• P0442Evaporative Emission System Leak Detected (Small Leak) Usually OK to drive
• P0446Evaporative Emission System Vent Control Circuit Usually OK to drive
• P0455Evaporative Emission System Leak Detected (Large Leak) Usually OK to drive
• P0456Evaporative Emission System Leak Detected (Very Small Leak) Usually OK to drive
• P0457Evaporative Emission System Leak Detected (Fuel Cap Loose/Off) Usually OK to drive

Electrical

• P0562System Voltage Low Drive with caution
• P0606Control Module Processor Fault Drive with caution

Engine timing

• P0008Engine Position System Performance (Bank 1) Drive with caution
• P0010'A' Camshaft Position Actuator Circuit (Bank 1) Drive with caution
• P0011'A' Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) Drive with caution
• P0014'B' Camshaft Position – Timing Over-Advanced or System Performance (Bank 1) Drive with caution
• P0016Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A) Get it checked now
• P0017Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor B) Get it checked now
• P0335Crankshaft Position Sensor 'A' Circuit Malfunction Get it checked now
• P0340Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor) Drive with caution

Fuel mixture

• P0171System Too Lean (Bank 1) Drive with caution
• P0172System Too Rich (Bank 1) Usually OK to drive
• P0174System Too Lean (Bank 2) Drive with caution

Fuel system

• P0087Fuel Rail/System Pressure – Too Low Drive with caution
• P0463Fuel Level Sensor 'A' Circuit High Usually OK to drive

Idle

• P0507Idle Air Control System RPM Higher Than Expected Usually OK to drive

Manufacturer-specific

• P1326Knock Sensor Detection System (Hyundai/Kia) Get it checked now

Misfire

• P0300Random/Multiple Cylinder Misfire Detected Get it checked now
• P0301Cylinder 1 Misfire Detected Drive with caution
• P0302Cylinder 2 Misfire Detected Drive with caution
• P0303Cylinder 3 Misfire Detected Drive with caution
• P0304Cylinder 4 Misfire Detected Drive with caution
• P0305Cylinder 5 Misfire Detected Drive with caution
• P0306Cylinder 6 Misfire Detected Drive with caution

Network

• U0100Lost Communication With ECM/PCM 'A' Get it checked now
• U0101Lost Communication With TCM Drive with caution
• U0121Lost Communication With ABS Control Module Drive with caution

Oxygen sensor

• P0135O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) Usually OK to drive

Throttle

• P2111Throttle Actuator Control System – Stuck Open Get it checked now
• P2112Throttle Actuator Control System – Stuck Closed Get it checked now
• P2135Throttle/Pedal Position Sensor 'A'/'B' Voltage Correlation Drive with caution
• P2138Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation Drive with caution

Transmission

• P0700Transmission Control System Malfunction Drive with caution
• P0715Input/Turbine Speed Sensor 'A' Circuit Drive with caution
• P0720Output Speed Sensor Circuit Drive with caution
• P0741Torque Converter Clutch Circuit Performance or Stuck Off Drive with caution
• P0776Pressure Control Solenoid 'B' Performance or Stuck Off Drive with caution

Turbocharger

• P0299Turbocharger/Supercharger 'A' Underboost Condition Drive with caution

New to codes? Start with OBD2 Explained. The counts and patterns behind these pages are on Trends.