2012 Civic P2646?

[maverickfhs]

Trying to get some help - 2012 Civic has been running fine and was running without any issues, no oil burning or leakage.

Only drained old oil, didn't touch the filter - added Castrol Magnatec 5W20 synthetic oil but after a few hundred miles P2646 came.

Verified oil level is good and confirmed from dip stick, added a bit more to be 100%.

What else could be causing it or shall I just drain oil and change filter too?

 

[Merek]

Here is a video that explains what it is. I'd say the Castrol cleaned out some crud and knocked it loose thereby clogging up the screen or the switch.

 

[maverickfhs]

I suspect too, oddly color of the oil is bit darker with close to 1000 miles now.

If I change oil, would be waste of good and expensive oil and hence the question

 

[Nukeman7]

Trying to get some help - 2012 Civic has been running fine and was running without any issues, no oil burning or leakage.

Only drained old oil, didn't touch the filter - added Castrol Magnatec 5W20 synthetic oil but after a few hundred miles P2646 came.

Verified oil level is good and confirmed from dip stick, added a bit more to be 100%.

What else could be causing it or shall I just drain oil and change filter too?

Odds are high that the micromesh screen on the VTEC solenoid (AKA, "spool valve") gasket is clogged with debris or gummed up. Try changing it with an $8 Honda OEM part, the Dorman aftermarket part only costs $5, but does not seal correctly. Don't overtorque the 10mm mounting bolts (~96 inch-lbs.) or it will destroy the rubber gasket seal.

 

[Merek]

There's a screen for the Vtec on my d16, I didn't get a chance to look at how bad it was but there was an oil leak dripping down and running around to the front of the motor. I had my car at the local garage for other service and just let them replace it for me while they had it.

 

[The Critic]

https://static.nhtsa.gov/odi/tsbs/2015/SB-10098946-5233.pdf