P2678
Coolant Degassing Valve Control Circuit/Open
P2678 is an OBD-II diagnostic trouble code meaning: Coolant Degassing Valve Control Circuit/Open. Common causes: open or short circuit in control circuit, degassing valve malfunction. Estimated repair cost: $17–56.
Symptoms
- Engine overheating
- Unstable engine operation
- Increased fuel consumption
- Check Engine Light Is On
- Poor interior heating
Causes
- Open or short circuit in control circuit
- Degassing valve malfunction
- Problems with the engine control unit
- Corrosion of contacts or connectors
- Wiring harness damage
How to Fix
- Check the integrity of the valve control circuit
- Check the resistance of the degassing valve
- Inspect connectors and contacts for corrosion
- Replace degassing valve if necessary
- Check the operation of the system after repair
Related codes
Error P2678 by Vehicle Brand
FAQ
What does the P2678 code mean?
P2678 is an OBD-II diagnostic trouble code that indicates: Coolant Degassing Valve Control Circuit/Open
What causes a P2678 error code?
The most common causes of P2678 include: Open or short circuit in control circuit; Degassing valve malfunction; Problems with the engine control unit; Corrosion of contacts or connectors.
How do I fix a P2678 diagnostic trouble code?
To fix P2678: Check the integrity of the valve control circuit. Check the resistance of the degassing valve. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2678?
Limited driving only, diagnose soon
How much does it cost to fix P2678?
The estimated repair cost for P2678 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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