sgo70

Hey, I got a problem totally unrelated to my Gen 5 swap, it's on my GMC 2500HD truck Gen IV 6.0/6L80.
P2647- "A" rocker arm actuator system stuck on (bank 1)
P0325-Knock sensor 1 circuit (bank 1)

I assume the knock is because of the actuator but I hate to say it, I don't even know what or where it is let alone how to test or replace it. Hopefully it's not too bad because my garage is packed from my Defender 110 build so I have to do this in the back alley haha.

Any input or advice, I'm going to flush and change the oil first but that's about all I could find in Google world.

Thanks in advance,
Sean

sgo70

Is this the same as a VVT actuator???

Thanks again.

sgo70

Well now I changed the oil, cleared the fault.....for now, and I'm getting P0172 and P0175 system too rich......