U0647
Lost Communication With Motor Electronics Coolant Pump B
U0647 is an OBD-II diagnostic trouble code meaning: Lost Communication With Motor Electronics Coolant Pump B. Common causes: open or short circuit in the pump circuit, cooling pump malfunction. Estimated repair cost: $56–167.
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
Error U0647 by Vehicle Brand
FAQ
What does the U0647 code mean?
U0647 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Motor Electronics Coolant Pump B
What causes a U0647 error code?
The most common causes of U0647 include: Open or short circuit in the pump circuit; Cooling pump malfunction; Wiring Harness Problems; Control unit malfunction.
How do I fix a U0647 diagnostic trouble code?
To fix U0647: Check the coolant pump fuse. Check the integrity of wiring and connectors. Check the functionality of the cooling pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0647?
Do not drive — repair immediately
How much does it cost to fix U0647?
The estimated repair cost for U0647 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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