P2D40

Hybrid/EV Battery Cooling System C Performance

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Hybrid system power reduction
Battery overheat warning on instrument panel
Extended charging time (for plug-in hybrids/EVs)
Reduced electric range
Noise from the cooling system

Causes

Battery cooling pump malfunction
Low coolant level
Cooling circuit clogged
Problems with battery temperature sensors
Malfunction of the cooling system control module

How to Fix

Check the level and condition of the coolant
Diagnose the operation of the cooling system pump
Check the tightness of the cooling system
Scan battery temperature sensors
Update the control module software (if necessary)
Repair only from an authorized dealer

Related codes

P2D41 P2D42 P0A7F