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4 cylinder Solenoid deactivation codes

socalcruiser

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socalcruiser New Member

socalcruiser

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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
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Jsdirt Senior Enthusiast

Jsdirt

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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.

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