Should the engine mangement light come on, you can read most issues through the OBD port using a suitable code reader. More information can be found on the relevant pages for your particular smart: fortwo 450, fortwo 451 and Roadster. Should your code reader simply give you a fault code, please use this system to look up the description, possible cause and resolution where available.
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OBD Codes
| Name | Description |
|---|---|
| P0734 |
Gear 4 Incorrect ratio |
| P0735 |
Gear 5 Incorrect ratio |
| P0736 |
Reverse incorrect gear ratio |
| P0740 |
Torque Converter Clutch Circuit Malfuction |
| P0741 |
Torque Converter Clutch Circuit Performance or Stuck Off |
| P0742 |
Torque Converter Clutch Circuit Stuck On |
| P0743 |
Torque Converter Clutch Circuit Electrical |
| P0744 |
Torque Converter Clutch Circuit Intermittent |
| P0745 |
Pressure Control Solenoid Malfunction |
| P0746 |
Pressure Control Solenoid Performance or Stuck Off |
| P0747 |
Pressure Control Solenoid Stuck On |
| P0748 |
Pressure Control Solenoid Electrical |
| P0749 |
Pressure Control Solenoid Intermittent |
| P0750 |
Shift Solenoid A Malfunction |
| P0751 |
Shift Solenoid A Performance or Stuck Off |
| P0752 |
Shift Solenoid A Stuck On |
| P0753 |
Shift Solenoid A Electrical |
| P0754 |
Shift Solenoid A Intermittent |
| P0756 |
Shift Solenoid B Performance or Stuck Off |
| P0757 |
Shift Solenoid B Stuck On |
| P0758 |
Shift Solenoid B Electrical |
| P0759 |
Shift Solenoid B Intermittent |
| P0760 |
Shift Solenoid C Malfunction |
| P0761 |
Shift Solenoid C Performance or Stuck Off |
| P0762 |
Shift Solenoid C Stuck On |
| P0763 |
Shift Solenoid C Electrical |
| P0764 |
Shift Solenoid C Intermittent |
| P0765 |
Shift Solenoid D Malfunction |
| P0766 |
Shift Solenoid D Performance or Stuck Off |
| P0767 |
Shift Solenoid D Stuck On |
