U0647

Lost Communication With Motor Electronics Coolant Pump B

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Engine overheating
Check Engine Light Is On
Reduced engine power
Unstable engine operation
Increased fuel consumption

Causes

Open or short circuit in the pump circuit
Cooling pump malfunction
Wiring Harness Problems
Control unit malfunction
Poor contact in the pump connector

How to Fix

Check the coolant pump fuse
Check the integrity of wiring and connectors
Check the functionality of the cooling pump
Scan the control unit for other errors
If necessary, replace the cooling pump

Related codes

U0646 U0648 U0650