Diagnostic Trouble Code Index for July 2026
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 |
| 1 | P0037 | Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Low Voltage | Toyota |
| 1 | P0178 | Fuel Composition Sensor Low Frequency | Chevrolet |
| 1 | P0344 | Camshaft Position Sensor Signal Intermittent | Honda |
| 1 | P0629 | Fuel Pump Relay Control Circuit High Voltage | Mercedes-Benz |
| 1 | P1790 | Fault Immediately After Shift | Mercedes-Benz |
| 1 | P2295 | Fuel Pressure Solenoid 2 Control Circuit Low | Volkswagen |
| 1 | P2393 | The ignition angle setting has a malfunction when cold starting | Mercedes-Benz |
| 1 | U0001 | CAN 'C' Bus | Ram |
| 1 | U0101 | Lost Communication With TCM | Ram |
| 1 | U4270 | implausible data received from EIS | Mercedes-Benz |
