Tranny Codes: wont go into gear

[8100 Power]

My friends truck would not go into gear this morning. His truck is a 06 LBZ like mine. Stock tranny with a EFILive tune (around 100HP). I pulled these codes:

0751
0843
0873
0700

I started it up when I got there and it worked fine, so I cleared the codes, it came back one more time. But after clearing them for the second time, I drove it and everything is fine. Shifts perfect, TCCSLIP seems ok also.

Any help is appreciated! Thanks.

 

[Mike L.]

P0843 is the one you're concerned with. Sounds like a bad PSM. TCM is not getting correct feedback on shift valve position from the manifold.

 

[8100 Power]

P0843 is the one you're concerned with. Sounds like a bad PSM. TCM is not getting correct feedback on shift valve position from the manifold.

You think our best bet is to start there? Replacing the PSM?

 

[fast03]

I had the same problem on my 03 with all those code and more. Pulld out of the drive then at the first stop sign it went into neutral. I cycled the key a few times and it has not done it since. I thought my problem was because the truck sat in my sloped driveway for almost 3 weeks, so I thought maybe the converter drained.