U063D

Lost Communication With Hybrid/EV Electronics Coolant Pump A

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
Overheating of electronic components
Noisy cooling pump
Switching to emergency mode

Causes

Open or short circuit in the pump circuit
Pump motor malfunction
Problems with connectors or wiring harness
Pump control unit failure
Problems in the CAN network

How to Fix

Check fuses and pump relays
Diagnose the power supply and pump control circuit
Check the condition of the connectors and wiring harness
Test the pump operation
Check for ECU firmware updates

Related codes

U063E U063F U0640