P2678 OBD-II: Coolant Degassing Valve Control Circuit/Open
P2678 Severity
Should you fix P2678 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P2678?
The Coolant Degassing Valve allows Coolant that has been vaporized to return to the pressurized overflow tank. If this Valve does not operate as requested by the engine computer (PCM), code P2678 will be stored.
Ask our experts about P2678.
RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.
Call us at 877-913-1554
Available 9am – 6pm ET Monday through Friday
