OBD
P2D4C
Hybrid/EV Battery Pack H Over Temperature
What it means
P2D4C means Hybrid/EV Battery Pack H Over Temperature.
Check these first
- Battery pack H running hot
- Air in the battery coolant loop
- A failed battery cooling pump
- A faulty pack H temperature sensor
- A blocked battery coolant passage
What to do next
- Read battery pack H temperature on a scan tool
- Bleed air from the battery coolant loop
- Command the battery cooling pump on
- Test the pack H temperature sensor
- Repair the blocked battery coolant passage
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.