OBD
P2D38
Hybrid/EV Battery Pack Heater Performance
What it means
P2D38 means Hybrid/EV Battery Pack Heater Performance.
Check these first
- A failed battery pack heater element
- A failed battery pack heater relay
- A blown battery pack heater fuse
- An open in the pack heater control wire
- A faulty pack heater control module
What to do next
- Check the battery pack heater fuse and relay
- Measure the pack heater element resistance
- Command the battery pack heater on with a scan tool
- Test the pack heater control circuit
- Replace the pack heater if it does not heat
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.