To resolve error code E-41, you should follow these steps:
1. Check the traction motor relay and contactor for any loose connections or damage.
2. If there are no loose connections or damage, you may need to replace the relay or contactor.
3. Once you have replaced the relay or contactor, clear the error code by turning the key switch off and then back on.
If the error code persists after following these steps, you should contact a Nissan forklift dealer for further assistance.