Question about 2004 Honda Civic

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Code P2646 This code is showing up P2646 Rocker Arm Actuator Prf or Stuck Off. Can you tell me what thhis is.

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  • locoyoel Dec 20, 2008

    code p2646 and replace the vtec solenoid and it came back

  • Anonymous Dec 20, 2008

    Do you have the same Problem?

  • Anonymous Mar 30, 2014

    Want start

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Change your oil

Posted on Dec 15, 2009


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I believe it has to do with the vtec functioning. At certain time in accleration during rpm range the valve timing changes and it is probably a sensor that detects rpms. you need to check with someone else though because I am not an expert on hondas, just understand the principle of how it works.

Posted on Dec 22, 2008

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Your going to need a air pressure regulator or better yet if the ECM found fault price it and replace it
  1. Start the engine, and let it run for 5 minutes, then turn the ignition switch to LOCK (0).
  2. Remove the cylinder head cover.
  3. Set the No. 1 piston at top dead center (TDC).
  4. Move the intake secondary rocker arm A for the No. 1 cylinder. The secondary rocker arm A should move independently of the secondary rocker arm B.
    1. If the intake secondary rocker arm A moves freely, go to step 5.
    2. If the intake secondary rocker arm A does not move, remove the secondary rocker arms as an assembly, then check that the pistons in the secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the secondary rocker arms as an assembly, then retest.
    3. Repeat step 4 on the remaining intake secondary rocker arms with each piston at TDC. When all the secondary rocker arms pass the test, go to step 6.
    4. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4.0 kgf/cm2, 57 psi).
    5. Inspect the valve clearance.
    6. Install a 10 x 1.0 mm adapter to the inspection hole, then connect the air pressure regulator
  5. With the specified air pressure applied, move the intake secondary rocker arm A for the No. 1 cylinder. The secondary rocker arm A and secondary rocker arm B should move together. If the intake secondary rocker arm A does not move, remove the secondary rocker arms as an assembly, and check that the pistons in the secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the secondary rocker arms as an assembly, then retest.
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