Strange series of events….code 2772

2018 SR5 DC, 5.7 4x4, 75,000 miles. So l had a couple weeks off of work for the Christmas/new years holiday. The truck sat in my driveway for over a week. I went to get something out of my center console and heard rattling in the "lid". I started to shake it a bit, and pumpkin seeds started pouring out the bottom! Probably at least a cup! (We live in the country - have livestock and gardens. Grow lots of pumpkins....). So l assume a mouse must've gotten up in there?! How!? I also have a console vault installed. I put a couple mouse traps on top of the vault with the console lid open. But didn't get anything.

A couple days later I drove the truck and the dash lights up like a Christmas tree! Check engine, traction control, pre collision sensor, trailer brake malfunction. Collision and trailer malfunction alternate messages in the center of the dash "....

Visit your dealer" etc. I checked under the hood for any visibly chewed wires and didn't see anything. I saw a few posts about knock sensor wires? I am going to have my mechanic buddy plug it in and get codes. But I just wondered if the combination of these 4 warnings could be narrowed down to a specific wire(s)? Or is it not even a chewed wire and just a strange coincidence? Truck seems to be running fine.

I’m at my buddies shop right now. It’s throwing code 2772. 4wd lo circuit. Comes on at 22mph. 4wd is working fine. He’s a bit perplexed.

 

Anyone chime in here?

 

With that code, I would start looking for chewed wire in two places. The xfer case actuators under the truck and the 4wd ecu behind and right of the glove box. The wires between those points go right through the area you have visitors. I believe they go through the center console and there is a 20 pin connector directly under/ in front of the console. Will likely need a wiring diagram and test the 10 odd wires going between those two items I mentioned. The diagrams are available. Just do a search here.

 

I know this post didn’t get much traction. But for anyone curious, there was a nest under the intake manifold and the knock sensor wire was chewed. Dirty b@$tard$. Here’s some photos for reference of where this is located. Is was a real bugger to get the manifold off. The harness closest to the firewall was quadruple taped, and zip tied, and clipped from the interior side of the firewall. That needed to come off to remove the manifold.