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Free OBD-II Check Engine Code Lookup

Browse all 127 OBD-II diagnostic trouble codes. Each page covers causes, repair costs, and step-by-step fixes. Free — no signup required.

Cooling

P0115Engine Coolant Temperature Sensor CircuitP0116Engine Coolant Temperature Sensor Range/PerformanceP0117ECT Sensor Low VoltageP0118ECT Sensor High VoltageP0125Insufficient Coolant Temperature for Closed...P0128Coolant Thermostat — Temperature Below...P0480Cooling Fan 1 Control Circuit...P0481Cooling Fan 2 Control Circuit...

Electrical

P0560System Voltage MalfunctionP0562System Voltage LowP0563System Voltage HighP0606PCM/ECM Processor FaultP0627Fuel Pump Control Circuit Open

Emissions

P0400Exhaust Gas Recirculation Flow MalfunctionP0401EGR Flow InsufficientP0402EGR Flow ExcessiveP0403EGR Control Circuit MalfunctionP0404EGR Control Circuit Range/PerformanceP0410Secondary Air Injection System MalfunctionP0420Catalyst System Efficiency Below Threshold...P0421Warm-Up Catalyst Efficiency Below Threshold...P0430Catalyst System Efficiency Below Threshold...P0431Warm-Up Catalyst Efficiency Below Threshold...P0440Evaporative Emission System MalfunctionP0441Evaporative Emission System Incorrect Purge...P0442Evaporative Emission System — Small...P0443EVAP Purge Control Valve CircuitP0446Evaporative Emission Control System Vent...P0455Evaporative Emission System — Large...P0456Evaporative Emission System — Very...P0457Evaporative Emission System Leak —...P2002Particulate Filter Efficiency Below Threshold...

Engine

P0010Camshaft Position Actuator Circuit —...P0011Camshaft Position Over-Advanced — Bank...P0012Camshaft Position Over-Retarded — Bank...P0013Camshaft Position Actuator Circuit Exhaust...P0014Camshaft Position Over-Advanced Exhaust —...P0016Crankshaft/Camshaft Position Correlation — Bank...P0017Crankshaft/Camshaft Correlation — Bank 1...P0018Crankshaft/Camshaft Correlation — Bank 2...P0019Crankshaft/Camshaft Correlation — Bank 2...P0020Camshaft Position Actuator Circuit —...P0021Camshaft Position Over-Advanced — Bank...P0120Throttle Position Sensor Circuit MalfunctionP0121TPS Range/Performance ProblemP0122TPS Low InputP0123TPS High InputP0200Injector Circuit MalfunctionP0201Injector Circuit Malfunction — Cylinder...P0202Injector Circuit Malfunction — Cylinder...P0203Injector Circuit Malfunction — Cylinder...P0204Injector Circuit Malfunction — Cylinder...P0234Turbocharger Overboost ConditionP0235Turbocharger Boost Pressure Sensor A...P0236Turbocharger Boost Sensor A PerformanceP0243Turbocharger Wastegate Solenoid A MalfunctionP0299Turbocharger/Supercharger Underboost ConditionP0300Random/Multiple Cylinder Misfire DetectedP0301Cylinder 1 MisfireP0302Cylinder 2 MisfireP0303Cylinder 3 MisfireP0304Cylinder 4 MisfireP0305Cylinder 5 MisfireP0306Cylinder 6 MisfireP0307Cylinder 7 MisfireP0308Cylinder 8 MisfireP0320Ignition/Distributor Engine Speed Input Circuit...P0325Knock Sensor 1 Circuit MalfunctionP0326Knock Sensor 1 Range/PerformanceP0327Knock Sensor 1 Low InputP0330Knock Sensor 2 Circuit MalfunctionP0335Crankshaft Position Sensor Circuit MalfunctionP0336Crankshaft Position Sensor Range/PerformanceP0340Camshaft Position Sensor Circuit —...P0341Camshaft Position Sensor Range/Performance —...P0345Camshaft Position Sensor Circuit —...P0505Idle Air Control System MalfunctionP0506Idle Air Control System RPM...P0507Idle Air Control System RPM...P3400Cylinder Deactivation System Bank 1

Fuel System

P0087Fuel Rail/System Pressure Too LowP0088Fuel Rail/System Pressure Too HighP0089Fuel Pressure Regulator PerformanceP0171System Too Lean — Bank...P0172System Too Rich — Bank...P0174System Too Lean — Bank...P0175System Too Rich — Bank...

Network

U0100Lost Communication with ECM/PCMU0101Lost Communication with TCMU0121Lost Communication with ABS Control...U0155Lost Communication with Instrument Panel...

Sensors

P0100Mass Air Flow Sensor Circuit...P0101MAF Sensor Range/Performance ProblemP0102MAF Sensor Low InputP0103MAF Sensor High InputP0105Manifold Absolute Pressure Sensor CircuitP0106MAP Sensor Range/PerformanceP0107MAP Sensor Low InputP0108MAP Sensor High InputP0110Intake Air Temperature Sensor CircuitP0112IAT Sensor Low InputP0113Intake Air Temperature Sensor High...P0130O2 Sensor Circuit Malfunction —...P0133O2 Sensor Slow Response —...P0134O2 Sensor No Activity —...P0135O2 Sensor Heater Circuit —...P0136O2 Sensor Circuit — Bank...P0141O2 Sensor Heater Circuit —...P0150O2 Sensor Circuit — Bank...P0155O2 Sensor Heater Circuit —...P0161O2 Sensor Heater Circuit —...P0500Vehicle Speed Sensor MalfunctionP0501Vehicle Speed Sensor Range/Performance

System

P1000OBD System Readiness Test Not...

Transmission

P0700Transmission Control System MalfunctionP0705Transmission Range Sensor Circuit Malfunction...P0711Transmission Fluid Temperature Sensor Range/PerformanceP0715Turbine/Input Shaft Speed Sensor CircuitP0720Output Speed Sensor Circuit MalfunctionP0730Incorrect Gear RatioP0740Torque Converter Clutch Circuit MalfunctionP0741Torque Converter Clutch Stuck OffP0748Pressure Control Solenoid A ElectricalP0750Shift Solenoid A MalfunctionP0755Shift Solenoid B MalfunctionP0760Shift Solenoid C MalfunctionP0780Shift Malfunction
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