P06DD DTC - 2018 Tahoe PPV

[CrashTestDummy]

Driving my co-driver's Tahoe to the local recycle station today and discovered the CEL on. I checked the gauges and saw everything in normal range. I maintained a heightened sense of awareness on the trip to the station and back to the house, and sensed no issues. Got home, and ran a scan on the truck and it's posted a P06DD, indicating an issue with the engine oil pressure control circuit. The oil pressure looks fine, and the oil level is good. The last oil change was about 2000 miles ago, and the color and smell is good.

When running at idle, it sounds a bit like a power steering pump whine when it's low on fluid, but otherwise, there's no other notable issues. Since I'm seeing good oil pressure (over 40 at idle, then goes up a bit from there with some throttle input), I guess replacing the oil pressure sending unit and screen is really just throwing money in the wrong area.

I found a TSB on the issue, PIP5555 and PIP5555A, but any PDFs I'm finding are missing ALL of the pictures mentioned in the couple of paragraphs in the TSBs.

I guess we're in for an oil pump, timing gear and chain and tensioner replacement, unless others here have a different idea.....

 

[CrashTestDummy]

Cleared the code and restarted the Tahoe. The code immediately came back. I tried to unplug the solenoid wiring where it came out of the front cover, but while I could unlock the plastic lock, I couldn't get an angle on it to unplug it. Since I DID move it around some, I figured if it were corrosion, that would hopefully help, but it did not. We do have oil pressure, 40 at idle, and it goes to a bit over 50 at ~1800 RPM, so I'm pretty sure it's that dam solenoid sensor!

It doesn't look to be an easy task, and while I have a note out to a friend in the bigness, I may end up just seeing if Chevy will do it.

Oh, and you can't just look up 'DTC P06DD' in the appendix of the FSM!! Luckily, I found it in Volume 5 listed numerically in the list of DTC codes.