P0C49

Hybrid/EV Battery Pack Coolant Pump A Control Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
Battery overheating
Noise or lack of operation of the cooling pump
Reduced vehicle power

Causes

Broken or damaged pump wiring harness
Pump solenoid valve malfunction
Problems with the control unit
Corrosion or poor contact in connectors
Malfunction of the cooling pump itself

How to Fix

Check the integrity of the pump wiring harness
Check connectors and contacts for corrosion
Test control circuit resistance
Replace the cooling pump if necessary
Check and update the control unit software

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