OBD2 trouble codes list

The 227 most common OBD2 diagnostic trouble codes (DTC) explained: what each one means, its causes, symptoms, severity and how to fix it.

• C0035 — Left Front Wheel Speed Sensor Circuit
• C0040 — Right Front Wheel Speed Sensor Circuit
• C0045 — Left Rear Wheel Speed Sensor Circuit
• C0050 — Right Rear Wheel Speed Sensor Circuit
• P0008 — Engine Position System Performance (Bank 1)
• P0010 — "A" Camshaft Position Actuator Circuit (Bank 1)
• P0011 — "A" Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)
• P0012 — "A" Camshaft Position – Timing Over-Retarded (Bank 1)
• P0013 — "B" Camshaft Position Actuator Circuit (Bank 1)
• P0014 — "B" Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)
• P0016 — Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A)
• P0017 — Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor B)
• P0018 — Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor A)
• P0019 — Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor B)
• P0021 — "A" Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)
• P0030 — HO2S Heater Control Circuit (Bank 1 Sensor 1)
• P0031 — HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
• P0036 — HO2S Heater Control Circuit (Bank 1 Sensor 2)
• P0037 — HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
• P0038 — HO2S Heater Control Circuit High (Bank 1 Sensor 2)
• P0045 — Turbocharger/Supercharger Boost Control "A" Circuit/Open
• P0046 — Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance
• P0068 — MAP/MAF – Throttle Position Correlation
• P0087 — Fuel Rail/System Pressure – Too Low
• P0088 — Fuel Rail/System Pressure – Too High
• P0089 — Fuel Pressure Regulator 1 Performance
• P0093 — Fuel System Leak Detected – Large Leak
• P0101 — Mass or Volume Air Flow "A" Circuit Range/Performance Problem
• P0102 — Mass or Volume Air Flow "A" Circuit Low Input
• P0103 — Mass or Volume Air Flow "A" Circuit High Input
• P0106 — Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
• P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
• P0108 — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
• P0110 — Intake Air Temperature Sensor Circuit Malfunction
• P0112 — Intake Air Temperature Sensor Circuit Low Input
• P0113 — Intake Air Temperature Circuit High Input Bank 1
• P0115 — Engine Coolant Temperature Sensor Circuit Malfunction
• P0116 — Engine Coolant Temperature Sensor Circuit Range/Performance
• P0117 — Engine Coolant Temperature Sensor Circuit Low Input
• P0118 — Engine Coolant Temperature Sensor Circuit 1 High Input
• P0120 — Throttle Position Sensor/Switch A Circuit Malfunction
• P0121 — Throttle Position Sensor/Switch A Circuit Range/Performance
• P0122 — Throttle Position Sensor/Switch A Circuit Low Input
• P0123 — Throttle Position Sensor/Switch A Circuit High Input
• P0125 — Insufficient Coolant Temperature for Closed Loop Fuel Control
• P0128 — Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
• P0130 — 02 Sensor Circuit Malfunction (Bank I Sensor 1)
• P0131 — O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
• P0132 — O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
• P0133 — 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)
• P0134 — O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
• P0135 — 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
• P0136 — 02 Sensor Circuit Malfunction (Bank I Sensor 2)
• P0137 — O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
• P0138 — O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
• P0139 — O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
• P0140 — O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
• P0141 — 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
• P0150 — 02 Sensor Circuit Malfunction (Bank 2 Sensor 1)
• P0151 — O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
• P0153 — 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)
• P0155 — 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
• P0156 — 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
• P0157 — O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
• P0161 — 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
• P0171 — System too Lean (Bank 1)
• P0172 — System too Rich (Bank 1)
• P0174 — System too Lean (Bank 2)
• P0175 — System Too Rich (Bank 2)
• P0190 — Fuel Rail Pressure Sensor A Circuit Malfunction
• P0191 — Fuel Rail Pressure Sensor A Circuit Range/Performance
• P0193 — Fuel Rail Pressure Sensor A Circuit High Input
• P0200 — Injector Circuit Malfunction
• P0217 — Engine Overtemperature Condition
• P0219 — Engine Overspeed Condition
• P0220 — Throttle/Pedal Position Sensor/Switch B Circuit Malfunction
• P0221 — Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance
• P0222 — Throttle/Pedal Position Sensor/Switch B Circuit Low Input
• P0223 — Throttle/Pedal Position Sensor/Switch B Circuit High Input
• P0230 — Fuel Pump Primary Circuit Malfunction
• P0234 — Turbocharger/Supercharger Overboost Condition
• P0299 — Turbocharger/Supercharger "A" Underboost Condition
• P0300 — Random/Multiple Cylinder Misfire Detected
• P0301 — Cylinder 1 Misfire Detected
• P0302 — Cylinder 2 Misfire Detected
• P0303 — Cylinder 3 Misfire Detected
• P0304 — Cylinder 4 Misfire Detected
• P0305 — Cylinder 5 Misfire Detected
• P0306 — Cylinder 6 Misfire Detected
• P0307 — Cylinder 7 Misfire Detected
• P0308 — Cylinder 8 Misfire Detected
• P0316 — Misfire Detected on Startup (First 1000 Revolutions)
• P0320 — Ignition/Distributor Engine Speed Input Circuit Malfunction
• P0325 — Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
• P0327 — Knock Sensor 1 Circuit Low Input (Bank 1)
• P0328 — Knock Sensor 1 Circuit High Input (Bank 1)
• P0332 — Knock Sensor 2 Circuit Low Input (Bank 2)
• P0335 — Crankshaft Position Sensor A Circuit Malfunction
• P0336 — Crankshaft Position Sensor A Circuit Range/Performance
• P0340 — Camshaft Position Sensor Circuit Malfunction (Bank 1)
• P0341 — Camshaft Position Sensor Circuit Range/Performance (Bank 1)
• P0344 — Camshaft Position Sensor A Circuit Intermittent (Bank 1)
• P0345 — Camshaft Position Sensor A Circuit Malfunction (Bank 2)
• P0351 — Ignition Coil A Primary/Secondary Circuit Malfunction
• P0352 — Ignition Coil B Primary/Secondary Circuit Malfunction
• P0353 — Ignition Coil C Primary/Secondary Circuit Malfunction
• P0354 — Ignition Coil D Primary/Secondary Circuit Malfunction
• P0355 — Ignition Coil E Primary/Secondary Circuit Malfunction
• P0356 — Ignition Coil F Primary/Secondary Circuit Malfunction
• P0365 — Camshaft Position Sensor "B" Circuit (Bank 1)
• P0366 — Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)
• P0380 — Glow Plug/Heater Circuit "A" Malfunction
• P0381 — Glow Plug/Heater Indicator Circuit Malfunction
• P0400 — Exhaust Gas Recirculation Flow Malfunction
• P0401 — Exhaust Gas Recirculation Flow Insufficient Detected
• P0402 — Exhaust Gas Recirculation Flow Excessive Detected
• P0403 — Exhaust Gas Recirculation Circuit Malfunction
• P0404 — Exhaust Gas Recirculation Circuit Range/Performance
• P0405 — Exhaust Gas Recirculation Sensor A Circuit Low
• P0406 — Exhaust Gas Recirculation Sensor A Circuit High
• P0410 — Secondary Air Injection System Malfunction
• P0411 — Secondary Air Injection System Incorrect Flow Detected
• P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
• P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1)
• P0430 — Catalyst System Efficiency Below Threshold (Bank 2)
• P0431 — Warm Up Catalyst Efficiency Below Threshold (Bank 2)
• P0440 — Evaporative Emission Control System Malfunction
• P0441 — Evaporative Emission Control System Incorrect Purge Flow
• P0442 — Evaporative Emission Control System Leak Detected (small leak)
• P0443 — Evaporative Emission Control System Purge Control Valve Circuit
• P0446 — Evaporative Emission Control System Vent Control Circuit Malfunction
• P0447 — Evaporative Emission Control System Vent Control Circuit Open
• P0449 — Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
• P0452 — Evaporative Emission Control System Pressure Sensor Low Input
• P0453 — Evaporative Emission Control System Pressure Sensor High Input
• P0455 — Evaporative Emission Control System Leak Detected (gross leak)
• P0456 — Evaporative Emissions System Small Leak Detected
• P0457 — Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
• P0496 — EVAP Flow During a Non-Purge Condition
• P0497 — Evaporative Emission System Low Purge Flow
• P0500 — Vehicle Speed Sensor "A" Malfunction
• P0501 — Vehicle Speed Sensor "A" Range/Performance
• P0505 — Idle Control System Malfunction
• P0506 — Idle Control System RPM Lower Than Expected
• P0507 — Idle Control System RPM Higher Than Expected
• P0508 — Idle Air Control System Circuit Low
• P0509 — Idle Air Control System Circuit High
• P0521 — Engine Oil Pressure Sensor/Switch Circuit Range/Performance
• P0522 — Engine Oil Pressure Sensor/Switch Circuit Low Voltage
• P0523 — Engine Oil Pressure Sensor/Switch Circuit High Voltage
• P0530 — A/C Refrigerant Pressure Sensor "A" Circuit
• P0532 — A/C Refrigerant Pressure Sensor "A" Circuit Low
• P0562 — System Voltage Low
• P0563 — System Voltage High
• P0571 — Cruise Control/Brake Switch A Circuit Malfunction
• P0600 — Serial Communication Link Malfunction
• P0601 — Internal Control Module Memory Check Sum Error
• P0602 — Control Module Programming Error
• P0603 — Internal Control Module Keep Alive Memory (KAM) Error
• P0604 — Internal Control Module Random Access Memory (RAM) Error
• P0605 — Internal Control Module Read Only Memory (ROM) Error
• P0606 — PCM Processor Fault
• P0615 — Starter Relay Circuit
• P0620 — Generator Control Circuit Malfunction
• P0627 — Fuel Pump "A" Control Circuit/Open
• P0641 — Sensor Reference Voltage "A" Circuit/Open
• P0651 — Sensor Reference Voltage "B" Circuit/Open
• P0700 — Transmission Control System Malfunction
• P0705 — Transmission Range Sensor A Circuit Malfunction (PRNDL Input)
• P0706 — Transmission Range Sensor A Circuit Range/Performance
• P0710 — Transmission Fluid Temperature Sensor A Circuit Malfunction
• P0711 — Transmission Fluid Temperature Sensor A Circuit Range/Performance
• P0715 — Input/Turbine Speed Sensor A Circuit Malfunction
• P0717 — Input/Turbine Speed Sensor A Circuit No Signal
• P0720 — Output Speed Sensor Circuit Malfunction
• P0730 — Incorrect Gear Ratio
• P0731 — Gear I Incorrect ratio
• P0732 — Gear 2 Incorrect ratio
• P0733 — Gear 3 Incorrect ratio
• P0734 — Gear 4 Incorrect ratio
• P0735 — Gear 5 Incorrect Ratio
• P0740 — Torque Converter Clutch Circuit Malfunction
• P0741 — Torque Converter Clutch Circuit Performance or Stuck Off
• P0743 — Torque Converter Clutch Circuit Electrical
• P0744 — Torque Converter Clutch Circuit Intermittent
• P0750 — Shift Solenoid A Malfunction
• P0753 — Shift Solenoid A Electrical
• P0755 — Shift Solenoid B Malfunction
• P0758 — Shift Solenoid B Electrical
• P0768 — Shift Solenoid D Electrical
• P0841 — Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance
• P0868 — Transmission Fluid Pressure Low
• P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
• P2004 — Intake Manifold Runner Control Stuck Open (Bank 1)
• P2096 — Post Catalyst Fuel Trim System Too Lean (Bank 1)
• P2097 — Post Catalyst Fuel Trim System Too Rich (Bank 1)
• P2098 — Post Catalyst Fuel Trim System Too Lean (Bank 2)
• P2099 — Post Catalyst Fuel Trim System Too Rich (Bank 2)
• P20EE — SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
• P2135 — Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
• P2138 — Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
• P2187 — System Too Lean at Idle (Bank 1)
• P2188 — System Too Rich at Idle (Bank 1)
• P2195 — O2 Sensor Signal Stuck Lean (Bank 1 Sensor 1)
• P2196 — O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1)
• P2270 — O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2)
• P2271 — O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2)
• P2279 — Intake Air System Leak
• P242F — Diesel Particulate Filter Restriction – Ash Accumulation
• P244A — Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
• P244B — Diesel Particulate Filter Differential Pressure Too High (Bank 1)
• P2452 — Diesel Particulate Filter Pressure Sensor "A" Circuit
• P2453 — Diesel Particulate Filter Pressure Sensor "A" Circuit Range/Performance
• P2458 — Diesel Particulate Filter Regeneration Duration
• P2463 — Diesel Particulate Filter Restriction – Soot Accumulation
• P2563 — Turbocharger Boost Control Position Sensor "A" Circuit Range/Performance
• P2BAD — NOx Exceedance – Root Cause Unknown
• U0001 — High Speed CAN Communication Bus
• U0073 — Control Module Communication Bus A Off
• U0100 — Lost Communication With ECM/PCM "A"
• U0101 — Lost Communication with TCM
• U0121 — Lost Communication With Anti-Lock Brake System (ABS) Control Module
• U0140 — Lost Communication With Body Control Module
• U0151 — Lost Communication With Restraints Control Module
• U0155 — Lost Communication With Instrument Panel Cluster (IPC) Control Module
• U0164 — Lost Communication With HVAC Control Module
• U0401 — Invalid Data Received From ECM/PCM "A"