Diagnostic Trouble Code Index for September 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 |
| 3 | P0301 | Cylinder 1 Misfire Detected | Ford, Mazda, Mitsubishi |
| 2 | P0174 | Fuel System Lean (Bank 2) | Ford, Toyota |
| 2 | P0300 | Multiple Cylinder Misfire Detected | Dodge, Mazda |
| 2 | P0302 | Cylinder 2 Misfire Detected | Dodge, Toyota |
| 2 | P0340 | Camshaft Position Sensor Circuit Malfunction | Dodge, Jeep |
| 2 | P0420 | Catalyst Efficiency Below Normal (Bank 1) | Chevrolet, Ford |
| 2 | P2188 | Fuel Trim System Rich At Idle (Bank 1) | Mercedes-Benz, Volkswagen |
| 1 | P0016 | Crankshaft/Camshaft Timing Misalignment | Audi |
| 1 | P0017 | Crankshaft Position - Exhaust Camshaft Position Correlation | Kia |
| 1 | P0031 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Low Voltage | Mercedes-Benz |
| 1 | P0051 | Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Low Voltage | Mercedes-Benz |
| 1 | P011B | Intake Air Temperature Sensor Circuit Malfunction | Toyota |
| 1 | P0138 | Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit High Voltage | Chevrolet |
| 1 | P0171 | Fuel System Lean (Bank 1) | Toyota |
| 1 | P0172 | Fuel System Rich (Bank 1) | Ford |
| 1 | P0177 | Water In Fuel | Ford |
| 1 | P0263 | Cylinder 1 Balance System Malfunction | Audi |
| 1 | P0266 | Cylinder 2 Balance System Malfunction | Audi |
| 1 | P0269 | Cylinder 3 Balance System Malfunction | Audi |
| 1 | P0272 | Cylinder 4 Balance System Malfunction | Audi |
| 1 | P0275 | Cylinder 5 Balance System Malfunction | Audi |
| 1 | P0278 | Cylinder 6 Balance System Malfunction | Audi |
| 1 | P0304 | Cylinder 4 Misfire Detected | Chrysler |
| 1 | P0305 | Cylinder 5 Misfire Detected | Honda |
| 1 | P0306 | Cylinder 6 Misfire Detected | Audi |
| 1 | P0316 | Misfire Occurred In First 1,000 Revolutions | Ford |
| 1 | P0344 | Camshaft Position Sensor Signal Intermittent | Dodge |
| 1 | P0352 | Ignition Coil 2 Control Circuit Malfunction | Mazda |
| 1 | P0394 | Camshaft Position Sensor 1 - Signal Intermittent | Dodge |
| 1 | P0406 | EGR Position Sensor Circuit High Voltage | Dodge |
| 1 | P0456 | EVAP System Very Small Leak Detected | Dodge |
| 1 | P0492 | Secondary air flow bank 2 | BMW |
| 1 | P0520 | Engine Oil Pressure Sensor Circuit Malfunction | Chrysler |
| 1 | P0606 | Control Module Internal Performance | Dodge |
| 1 | P0672 | Glow Plug No. 2 Control Circuit Malfunction | Ford |
| 1 | P0697 | 5-Volt Reference 3 Circuit Malfunction | GMC |
| 1 | P0705 | Transaxle Range Switch Circuit Malfunction | Nissan |
| 1 | P0720 | Output Shaft Speed Sensor Circuit Malfunction | Ford |
| 1 | P1082 | Fuel filter pressure sensor performance | GMC |
| 1 | P130A | Cylinder Disabling | Audi |
| 1 | P1336 | CKP Sensor System Variation Not Learned | GMC |
| 1 | P1399 | Random misfire | Honda |
| 1 | P140C | EGR slow response decreasing flow | Chevrolet |
| 1 | P1450 | Unable to Bleed Up Fuel Tank Vacuum | Volkswagen |
| 1 | P161A | Incorrect response from Immobilizer Control Module | Ford |
| 1 | P1777 | Step Motor - Circuit Malfunction | Nissan |
| 1 | P2127 | Accelerator Pedal Position Sensor 2 Circuit Low Voltage | Dodge |
| 1 | P2138 | Accelerator Pedal Position Sensor 1-2 Correlation Error | GMC |
| 1 | P219A | Bank 1 air-fuel ratio imbalance | Ford |
| 1 | P219B | fuel trim cylinder balance bank 2 | Ford |
| 1 | P2262 | Turbo/Super Charger Boost Pressure Not Detected - Mechanical | Ram |
| 1 | P226C | Turbo Boost Slow | Ram |
| 1 | P2271 | Heated Oxygen Sensor (Bank 1 Sensor 2) Signal Stuck Rich | Chevrolet |
| 1 | P2279 | Intake Air System Leak | Mercedes-Benz |
| 1 | P2463 | Diesel Particulate Filter Soot Level Accumulation | GMC |
| 1 | U0100 | Lost Communication With ECM/PCM | GMC |
| 1 | U0101 | Lost Communication With TCM | Nissan |
| 1 | U1000 | Class 2 Communication Malfunction | Nissan |
| 1 | U4010 | Invalid data from ecm/pcm a not current occuant classification system | Ford |
| 1 | U4016 | Invalid data from ecm/pcm a not current hvac | Ford |
| 1 | U4018 | Invalid data received from ECM/PCM | Ford |
