Did you ever find the cause of this or find a fix for it? I have the exact same problem. I’ve gotten C0561 randomly & intermittently a couple times over the last couple months. No other codes.

In Researching this problem, typically everyone has another code set with it, but I can’t find any thing that resolves just the C0561 by itself.

Have a 2007 Silverado 1500 LTZ 5.3L flex 0 vin.

My 2007 Silverado has the LMG 5.3L engine, which has AFM. It consumes a lot of oil, which I assume is because of AFM. I haven’t had any problems with the AGM or the lifters or cam so far, at least that I know of. AFM does improve gas mileage significantly when I’m taking long trips on the freeway basically bumps me up to an average of 17-19 miles per gallon. Where as normal city driving average is around 12-13 miles per gallon.

But it’s making me wonder if I disabled the AFM, how bad of an effect on mileage would it be, and will it help my cam & lifters overtime? And if I leave AFM in place will my lifters and cam be at risk for premature failure? And I also wonder if it will solve my C0561 problem I get once in while...?

Which AFM disabler are you using? And how has it worked out for you? What else did you have to do to your motor? Has it improved things?

I haven’t seen a pattern yet with C0561, as it’s only happened two times in the life of the truck. Though it did happen later in the drive cycle after I was driving around for a while. So it seems fairly random at the time, And I don’t have an association to any specific driving condition that may have tripped it so in the future I’ll keep an eye on it.

I recently bought a GM Tech2 tool w/Candi Interface so I could do some deeper diagnostics and check codes on the tons of modules my truck has

I did this because the standard code reader I had only read the engine and trans and ABS and didnt report every single code, so a lot of diagnostic information was missing.

I’ve only tried the Tech2 once or twice so far, And it appears to be a great deal better than standard scan tools, Plus has a more detailed description of the DTC in GM speak, as well as had the ability to do bi-directional testing as well as check every module in the truck, I’ve already found a couple more codes showing up that the standard scanner missed.

One of which was a code from the MAF sensor, saying it had a circuit low on one of the connections. But I know it’s not the MAF itself & its good, Because several months ago I did a full cleaning of the TBI air intake and related sensors parts and pieces. And the MAF reports correct values and still does. So I have to assume it’s just a connectivity issue between ECM and the MAF ,