The most common causes of P1C28 include: Electrical connector corrosion or damage; Control module communication error; Switch or actuator failure; Wiring short circuit or open circuit. A professional OBD-II scan tool is recommended for accurate diagnosis.

How do I fix P1C28 for Hyundai IONIQ 5?

Recommended steps to address P1C28: (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 P1C28?

Driving with P1C28 is not recommended for extended distances. Schedule service within a few days to prevent further damage. Monitor for any additional warning lights.

Hyundai IONIQ 5

P1C28

Warning

OPI (On-board Power Isolator) Current High

Severity

Warning

What does P1C28 mean?

Fault code P1C28 means "OPI (On-board Power Isolator) Current High". This is a Hyundai-specific EV diagnostic trouble code for the Hyundai E-GMP platform. It is classified as "powertrain" with a severity level of "warning". Applicable models: IONIQ 5, IONIQ 6, Kia EV6.

Possible Causes

Electrical connector corrosion or damage
Control module communication error
Switch or actuator failure
Wiring short circuit or open circuit

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 P1C28 information →