P0C4A

Hybrid/EV Battery Pack Coolant Pump A Control Performance

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
Battery overheating
Cooling pump noises
The vehicle goes into emergency mode

Causes

Battery cooling pump malfunction
Problems with wiring to the pump
Faulty relay or fuse
Problems with the control module
Low coolant level

How to Fix

Check the level and condition of the coolant
Diagnose the battery cooling pump
Check the integrity of the wiring and connectors
Check system relays and fuses
Scan the control module for errors

Related codes

P0C4B P0C4C P0C49