Diagnostic Trouble Code Index for January 2021
Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.Diagnostic Trouble Codes (DTC)
| Count | Trouble Code | Sample Definition | Manufacturers |
| 9 | P0171 | Fuel System Lean (Bank 1) | Chevrolet, Ford, GMC, Subaru, Toyota |
| 6 | P0300 | Multiple Cylinder Misfire Detected | Dodge, GMC, Honda, Kia, Volkswagen |
| 5 | P0174 | Fuel System Lean (Bank 2) | Chevrolet, Ford, GMC, Toyota |
| 4 | P0302 | Cylinder 2 Misfire Detected | Audi, Ford, Honda, Kia |
| 4 | P0303 | Cylinder 3 Misfire Detected | Dodge, Honda, Kia, Volkswagen |
| 4 | P0305 | Cylinder 5 Misfire Detected | Ford, Honda, Kia, Mercedes-Benz |
| 3 | P0301 | Cylinder 1 Misfire Detected | Honda, Kia, Volkswagen |
| 3 | P0304 | Cylinder 4 Misfire Detected | Honda, Mercedes-Benz, Volkswagen |
| 3 | P0420 | Catalyst Efficiency Below Normal (Bank 1) | Ford, Jeep, Kia |
| 3 | P2188 | Fuel Trim System Rich At Idle (Bank 1) | Hyundai, Smart, Volkswagen |
| 2 | P0101 | MAF Sensor Performance | Chevrolet |
| 2 | P0172 | Fuel System Rich (Bank 1) | Chevrolet |
| 2 | P0191 | Fuel Rail Pressure Sensor Performance | Mazda, Toyota |
| 2 | P0522 | Engine Oil Pressure Sensor Circuit Low Voltage | Dodge, Jeep |
| 2 | P2096 | Downstream Fuel System Lean - HO2S-12 (Bank 1 Sensor 2) | Chrysler, Jeep |
| 1 | B1213 | Less Than Two Keys Programmed To The System | Lincoln |
| 1 | P0016 | Crankshaft/Camshaft Timing Misalignment | Mercedes-Benz |
| 1 | P0018 | Crankshaft Position - Intake Camshaft Position Correlation (Bank 2) | Mercedes-Benz |
| 1 | P0019 | Crankshaft Position - Exhaust Camshaft Position Correlation (Bank 2) | Cadillac |
| 1 | P0032 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit High Voltage | Nissan |
| 1 | P0073 | Ambient Air Temperature Sensor Circuit High Voltage | Jeep |
| 1 | P0087 | Fuel Rail Pressure Too Low | Toyota |
| 1 | P0116 | ECT Sensor Performance | BMW |
| 1 | P0118 | ECT Sensor Circuit High Voltage | BMW |
| 1 | P0121 | TP Sensor Performance | Chevrolet |
| 1 | P0134 | Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Activity | Honda |
| 1 | P0151 | Heated Oxygen Sensor (Bank 2 Sensor 1) Circuit Low Voltage | GMC |
| 1 | P0157 | Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage | GMC |
| 1 | P0275 | Cylinder 5 Balance System Malfunction | Ford |
| 1 | P0306 | Cylinder 6 Misfire Detected | Mercedes-Benz |
| 1 | P0327 | Knock Sensor Circuit Low Voltage (Bank 1) | Volkswagen |
| 1 | P0401 | Insufficient EGR Flow Detected | Ford |
| 1 | P0442 | EVAP System Small Leak Detected | Smart |
| 1 | P0446 | EVAP Vent System Performance | GMC |
| 1 | P0453 | Fuel Tank Pressure Sensor Circuit High Voltage | Mercedes-Benz |
| 1 | P0456 | EVAP System Very Small Leak Detected | Chrysler |
| 1 | P0491 | Secondary AIR System Insufficient Flow Detected (Bank 1) | Volkswagen |
| 1 | P0492 | Secondary air flow bank 2 | Volkswagen |
| 1 | P0658 | Actuator Supply Voltage 1 Low | Jeep |
| 1 | P0672 | Glow Plug No. 2 Control Circuit Malfunction | Ford |
| 1 | P0700 | Automatic Transmission System Malfunction Detected | Subaru |
| 1 | P1101 | Intake Airflow System Performance | Chevrolet |
| 1 | P1130 | Air Fuel Ratio Sensor (Bank 1 Sensor 1) Circuit Malfunction | Volvo |
| 1 | P1148 | Closed Loop Malfunction Detected (Bank 1) | Nissan |
| 1 | P1237 | Fuel Pump Secondary Circuit Malfunction | Ford |
| 1 | P1260 | Immobilizer System Malfunction | Lincoln |
| 1 | P1487 | EGR Boost Sensor Solenoid Circuit Malfunction | Jeep |
| 1 | P1521 | Incorrect Engine Oil Type | Mazda |
| 1 | P1564 | ASCD Steering Switch Circuit Malfunction | Nissan |
| 1 | P1718 | Transmission Fluid Temperature Sensor Continually Reading Hot | Subaru |
| 1 | P2004 | Intake Manifold Runner Control Stuck Open | Mercedes-Benz |
| 1 | P200A | Intake manifold runner performance | Mercedes-Benz |
| 1 | P2172 | High Airflow / Vacuum Leak Detected (Instantaneous Accumulation) | Dodge |
| 1 | P2173 | High Airflow / Vacuum Leak Detected (Slow Accumulation) | Jeep |
| 1 | P2279 | Intake Air System Leak | Honda |
| 1 | P229F | Nox sensor 2 circuit/range performance | Mercedes-Benz |
| 1 | P2302 | Ignition Coil 1 Secondary Circuit Insufficient Ionization | Dodge |
| 1 | P2403 | Leak Diagnosis Pump - Reed Switch | Porsche |
| 1 | P2422 | EVAP Canister Vent Shut Valve Close Malfunction | Honda |
| 1 | P2441 | Secondary Air Injection System Switching Valve Stuck Closed | Toyota |
| 1 | P2463 | Diesel Particulate Filter Soot Level Accumulation | Chevrolet |
| 1 | U0101 | Lost Communication With TCM | Nissan |
| 1 | U1001 | Lost Communication With XXX Control Module | Nissan |
