If I'm running a 4L60e and getting codes P0700 and P0717, am I using the wrong TCM42? In the code explanation in the beginning, it shows that P0717 is a 4L80 code.

 

The OP originally posted his questions (reasonably) in this thread:
https://ls1tech.com/forums/automatic...lush-more.html

Since that thread had no activity in 2+ years, 80+ posts and referenced in our Stickies, I decided to start a new thread and close the old one.

 

What is this in? Has anything been done to the trans or is it stock and untouched? Curious because I have the same issue with my 4l60E. It is a fresh rebuild behind the 5.3L it came from the factory mated to and using the T42 TCM it came with.

I am running an aftermarket harness which I verified had the ISS wiring. The entire setup worked fine in the truck it was originally in, only change has been having the trans rebuilt, SS3600 stall and the aftermarket harness.

I found that tuning the P0717 out is not an option based on reputable tuner input to my inquiry. I am taking my care back to the shop that built the tranny to see if maybe it was rebuilt using the old style pump or input shaft or wrong internal harness. I'm curious to know if we have any similarities.

 

Mine is an 11 Ls3 from a Corvette with a 4L60e. I am running a harness from PSI (1038 I believe). I am using the stock Corvette ECM and until today was using a TCM from what I was told was from an 06 1500 series truck. I say up until today because I decided to try a TCM I had laying around from a 2008 Chevy Van Express 1500 with 4.3. After putting this TCM and taking a short ride, no more codes! It shifted much better although not at ideal points that I suspect is from incorrect tire size and rear end ratio. I wasn't able to go for a long ride but am very happy with how it performed compared to before. It downshifted good and some mixed throttle driving wasn't bad at all. No VSS code.

 

Great Idea! I sent my TCM and ECM in for base tuning. Maybe I ended up with the wrong TCM back? I ordered one from PSI today after reading your post. I'll try that first.

 

In the original thread by Performabilt (sticky), he mentions the codes I had as 4l80 specific. That's the only place I've seen that info. I asked for verification but didn't get an answer. It's tough when it seems no one has a definitive answer as to why the codes came up. I'm reasonably sure that the working TCM came from a 2008 1500 2wd 4.3 van. It seems to be communicating correctly with the factory E38 ECM. I also was unable to get a straight answer as to where to source a compatible TCM from. On a whim, I bought one from said van off of eBay and again on a whim tried it out. It's finally working like it should and will only get better once the gear ratio and tire size are set in the TCM. IMO see if you can find one of eBay or a local wrecking yard from a 4.3 2wd 08 van and see what happens.

 

All right....today, different story. Both codes are back and I have no idea why. Nothing has been changed. I'm not sure why they weren't there the day before. The trans still shifts fine other than early. I have an appointment with Speed Inc for a street tune in a few weeks. I'm hopeful that the issue is in the tuning. I tried plugging and unplugging the connector and looked over the wiring for damage. Everything looks to be fine.

Hawk...please let me know if the TCM you receive solves your issues. This is very frustrating.

 

The original thread you reference is quite old. The 4L80E has always had ISS, hence the code is well documented for those. The 4L60E didn't have ISS until 2006; add the typical 3-year factory warranty and builders did not see many ISS 4L60E until after 2009.
As far as I know, everyone with a TCM and a non-ISS 4L60E gets that code and no one know how to turn it off. If your trans has ISS, the problem should be solvable. Hopefully your new shop will figure it out.

 

Mrvedit...correct me if I'm wrong, but isn't the main connector on a later 4L60E a 17 pin and the earlier one 15 pin?

 

No, '95 thru '05 are 13 pin.
'06 thru '08 are 15 pins due to the 2 extra ISS pins.
(Not sure about '09+ when the 3-2 downshift was eliminated and the manifold pressure switch replaced with a mechanical switch)

Note: There may be a few ISS '05 transmissions, but by '06 (nearly?) all 4L60E are ISS.

 

Finally got my P0717 issue resolved! Hopefully this will help anyone else going through this. I went to car-part.com and located an ECM and TCM from a 2008 5.3L 2wd automatic truck (PSi's recommendation). I sent these in to Speed Inc for a base tune and finally no code for the transmission. The shift points aren't optimal, but it is shifting much-much better than it was using the other ECM and TCM. I'll have to get over there for a dyno tune to get a few things adjusted, but am confident in it's operation now.