The most common causes of P1556 include: Battery management system (BMS) malfunction; High voltage battery cell imbalance; Battery temperature sensor fault; High voltage contactor failure. A professional OBD-II scan tool is recommended for accurate diagnosis.

How do I fix P1556 for Nissan LEAF?

Recommended steps to address P1556: (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 P1556?

Driving with P1556 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

Nissan LEAF

P1556

Warning

Battery Temperature Sensor Circuit Malfunction

Severity

Warning

What does P1556 mean?

Fault code P1556 means "Battery Temperature Sensor Circuit Malfunction". This is a Nissan-specific EV diagnostic trouble code for the Nissan EV platform. It is classified as "battery" with a severity level of "warning". Applicable models: Nissan LEAF (2010+), Nissan LEAF e+ (2019+).

Possible Causes

Battery management system (BMS) malfunction
High voltage battery cell imbalance
Battery temperature sensor fault
High voltage contactor failure

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

This code applies to all vehicles. View generic P1556 information →