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P2646 code... I'm stumped HELP

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Old Jun 8, 2023
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P2646 code... I'm stumped HELP
OK here goes the story. Girlfriends 2004 civic si threw this code p2646 and goes into limp mode.
  • Scan and replace pressure switch, unhook battery and pull fuse for ecu reset. Works for a day.
  • Pull the vtec spool valve... screen is spotless.
  • Do an oil change as suggested and another reset. Works for half a day.... back to limpmode and same code.
  • Replace spool valve and do reset again. Works for 8 days and codes up again...
what else is there?
Wiring looks good connections are clean.. I'm lost. HELP ME PLEASE
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Did you also post this on K20a.org a week ago?

First step in the service manual says to check oil level. Then check oil pressure at the solenoid.

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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
? It seem that he is in Canada, so his car have the D17 engine?
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Originally Posted by sdaidoji
? It seem that he is in Canada, so his car have the D17 engine?
couldn't tell ya. 1.8l I think. I'm a dodge guy so these are not in my normal knowledge. Been threw all the basics you knowledgeable people have shared to no avail.
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Originally Posted by sdaidoji
? It seem that he is in Canada, so his car have the D17 engine?
Ahhhh, I had K series on the mind. Good catch. Troubleshooting steps are likely the same. Check oil, then check oil pressure.
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Originally Posted by Bcbassfishing
couldn't tell ya. 1.8l I think. I'm a dodge guy so these are not in my normal knowledge. Been threw all the basics you knowledgeable people have shared to no avail.
should be a 1.7, most likely a D17A2 if it is an Si (unless previous owner put a D17A1 or a D17A1)

https://www.civicforums.com/forums/1...ation-d17.html
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Originally Posted by sdaidoji
should be a 1.7, most likely a D17A2 if it is an Si (unless previous owner put a D17A1 or a D17A1)

https://www.civicforums.com/forums/1...ation-d17.html
no engine swap on this thing... little old lady had it and it only has 130km / 60k miles on the little mill. Going to go threw the wiring again but im out of ideas.
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Old Jun 8, 2023
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Re: P2646 code... I'm stumped HELP
Try an oe vtec solenoid, just grab one from the junkyard. Little old lady might not have done much hard driving, or frequent oil changes. Could also try an oil flush but you just changed it.
Last edited by Colin42; Jun 9, 2023 at 07:35 AM.
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Old Jun 9, 2023
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Re: P2646 code... I'm stumped HELP
Did you verify oil level is correct or not?
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