The most common causes of P1B79 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 P1B79 for Kia EV9?

Recommended steps to address P1B79: (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 P1B79?

Driving with P1B79 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

Kia EV9

P1B79

Warning

High Voltage Battery Temperature Sensor Level 2 Fault

Severity

Warning

What does P1B79 mean?

Fault code P1B79 means "High Voltage Battery Temperature Sensor Level 2 Fault". This is a Hyundai-specific EV diagnostic trouble code for the Hyundai E-GMP platform. It is classified as "battery" with a severity level of "warning". Applicable models: IONIQ 5, IONIQ 6, Kia EV6.

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 P1B79 information →