P0D66

Hybrid/EV Battery Pack Cooling Fan Enable Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Battery overheating
Hybrid system power reduction
Increased noise from the cooling system
Overheat warning on instrument panel
Reduced performance of the hybrid system

Causes

Cooling fan malfunction
Damage to the control circuit wiring harness
Short circuit in the circuit
Battery management module malfunction
Fan control relay problems

How to Fix

Check the condition of the cooling fan
Check the integrity of the wiring harness and connections
Check control circuit voltage
Check fan relay operation
Scan the battery management module for errors

Related codes

P0D65 P0D67 P0D68