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Honda CR-V Fault code P2647. How to troubleshoot?

  

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Hello Scotty.

I recently bought a Honda CR-V 2006 2.0l 2nd gen automatic from a car dealership. 

The car has about 16800 miles on it and has a fully stamped servicebook which i assume means it has had regurarly oil changes and inspection every 1200 miles or so.
The ten first years at Honda.

So for the problem. I drove the car home about 70 miles
and had no problems whatsoever. It was raining heavily though, i dont know If that matters. In the morning the car starts upp normally but i notice that the check engine light is on (not the oil pressure light). I run the OBD and the car shows fault code P2647 VTEC oil pressure switch circuit high voltage and code 83-01 ECM/PCM Relation Failure. The car runs normally during idling and there are no weird sounds from the engine bay.
I rev the engine above 3000rpm but i dont notice any limping. I havent been driving the car due to the risk of might making it worse. I am suspecting the fault might be electrical but Im not sure where to start troubleshooting? I bought new oil and a original Honda filter and ordered a new VVT valve although i dont know if this is the problem. Please help. Regards. Christian.


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Posted by: @sunnerfjell

I recently bought a Honda CR-V 2006 2.0l 2nd gen automatic from a car dealership. 

Did you have a mechanic inspect it before purchase? That thing is 19 years old and might have any number of hidden problems.

Posted by: @sunnerfjell

Im not sure where to start troubleshooting?

Have you looked up the code for troubleshooting information? For example:

https://www.carparts.com/blog/p2647-code-a-rocker-arm-actuator-system-stuck-on/

https://www.youtube.com/watch?v=phdB0G6lUqk

Also, you can find a repair manual here:

https://charm.li/Honda/2006/

Posted by: @sunnerfjell

ordered a new VVT valve although i dont know if this is the problem

We don't recommend blindly throwing parts at a problem without troubleshooting first. That rarely results in a good outcome. If you do find that a part or parts need to be replaced be sure to use OEM replacements ordered from a trustworthy source (not Amazon or eBay.)


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