This DTC has come up in a few other threads, but I wanted to create a separate thread dedicated since this has happened to a couple other drivers here and on Facebook. May become a common issue but let's hope not. Honda advance diagnostic for this code is attached. The warning that comes up on the car is "Emissions System Problem". I got this DTC a couple of times. Cleared it myself the first time. Came back this weekend. Took it into the dealership and they confirmed that the water valve is sticking. Like others it will take a week or so to get the part in. They said it is okay to drive as this would only be an issue when it is cold outside and the heater is trying to pull coolant from the ICE (if the ICE were on). Based on what I read, I tend to agree that it is okay to drive. Take a look at the attached service manual and let me know if you agree.