What are the common causes of P0D65?

A hybrid/EV battery pack cooling fan enable circuit with a low signal. A short to ground in the cooling fan enable circuit. A failed hybrid/EV battery pack cooling fan. A failed starter/generator control module.

Command the hybrid/EV battery pack cooling fan on with a scan tool. Look for a short to ground in the cooling fan enable circuit. Inspect the cooling fan connector and wiring. Test the cooling fan enable circuit for open and short faults. Replace the cooling fan or starter/generator control module if the low signal returns. Clear the code and retest.

P0D65

Hybrid/EV Battery Pack Cooling Fan Enable Circuit Low

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0D65 means Hybrid/EV Battery Pack Cooling Fan Enable Circuit Low.

Check these first

A hybrid/EV battery pack cooling fan enable circuit with a low signal
A short to ground in the cooling fan enable circuit
A failed hybrid/EV battery pack cooling fan
A failed starter/generator control module

What to do next

Command the hybrid/EV battery pack cooling fan on with a scan tool
Look for a short to ground in the cooling fan enable circuit
Inspect the cooling fan connector and wiring
Test the cooling fan enable circuit for open and short faults
Replace the cooling fan or starter/generator control module if the low signal returns
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.