Jump to content
  • 0

4 cylinder Solenoid deactivation codes

socalcruiser

Asked by socalcruiser,

 Share

Question

socalcruiser New Member

socalcruiser

Posted
Posted (edited)

I have a 2012 GMC Sierra with 5.3 Vortec. I had to replace one head due to damaged exhaust valve. Completed the work and truck is running but on reduced power. Code reader shows 3425-3441-3401-3449 which are the solenoid deactivation codes for the 4 AFM cylinders. I assume I have done something or missed something that is causing this to all 4 of these cylinders.  Any suggestions on what steps to take to resolve? Visual inspection of wiring and vacuum hoses has found nothing. Oil was change with Mobil 1 and new filter. Possoibly in limp mode but these are only codes showing.

Edited by socalcruiser
typo on one code
Link to comment
Share on other sites

1 answer to this question

Recommended Posts

  • 0
Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

You have to replace the VLOM - valve lifter oil manifold - any time it is removed, or lifters are replaced, if you haven't already.

 

Make sure everything is plugged back in, and no wires got pinched anywhere, including between the head and block. Since all 4 of them are down, I'd be looking at grounds.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to question listing


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept