U0618
Lost Communication With Engine Coolant Bypass Valve D
U0618 is an OBD-II diagnostic trouble code meaning: Lost Communication With Engine Coolant Bypass Valve D. Common causes: open or short circuit in valve circuit, bypass solenoid valve malfunction. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Unstable engine operation when warming up
- Engine overheating
- Decrease in interior heater efficiency
- Incorrect coolant temperature readings
Causes
- Open or short circuit in valve circuit
- Bypass solenoid valve malfunction
- Poor contact in valve connector
- Wiring harness damage
- Software error in the ECU
How to Fix
- Check the integrity of wiring and connectors
- Test bypass valve resistance
- Check voltage at valve connector
- Replace faulty bypass valve
- Update ECU firmware if necessary
Related codes
Error U0618 by Vehicle Brand
FAQ
What does the U0618 code mean?
U0618 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Engine Coolant Bypass Valve D
What causes a U0618 error code?
The most common causes of U0618 include: Open or short circuit in valve circuit; Bypass solenoid valve malfunction; Poor contact in valve connector; Wiring harness damage.
How do I fix a U0618 diagnostic trouble code?
To fix U0618: Check the integrity of wiring and connectors. Test bypass valve resistance. Check voltage at valve connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0618?
Limited driving only, diagnose soon
How much does it cost to fix U0618?
The estimated repair cost for U0618 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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