The most common causes of P31C9 include: On-board charger (OBC) communication error; Charging port connection issue; DC-DC converter malfunction; Charge controller fault. A professional OBD-II scan tool is recommended for accurate diagnosis.

Recommended steps to address P31C9: (1) Schedule service as soon as possible (2) Reduce driving speed and avoid long trips (3) Monitor for additional warning messages (4) Have the vehicle diagnosed by a certified technician. Always consult a qualified EV technician for high-voltage system repairs.

Is it safe to drive with P31C9?

Driving with P31C9 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

P31C9

Warning

Normal Charge Relay Welded Closed

Severity

Warning

What does P31C9 mean?

Fault code P31C9 means "Normal Charge Relay Welded Closed". This is a Nissan-specific EV diagnostic trouble code for the Nissan EV platform. It is classified as "charging" with a severity level of "warning". Applicable models: Nissan LEAF (2010+), Nissan LEAF e+ (2019+).

Possible Causes

On-board charger (OBC) communication error
Charging port connection issue
DC-DC converter malfunction
Charge controller fault

Recommended Actions

1 Schedule service as soon as possible
2 Reduce driving speed and avoid long trips
3 Monitor for additional warning messages
4 Have the vehicle diagnosed by a certified technician