ECU and TCU question

[mjferencak]

I want/need to do an engine swap soon and I'm trying to figure out this ECU and TCU issue. I have an 06' and I believe from what I've read is that the 4L60e doesn't have a TCU. Correct me if I'm wrong. Now if I decide to swap in lets say a L92 or LS3 and use the donor cars ECU and wiring harness can I use my 4L60e that doesn't have a TCU or do I need the 4L60e with a TCU to work with the donor ECU?

 

[amrg]

All 4l60s are similar. 2007+ may have an extra speed sensor but that can be added while you tear down your trans to adapt it to an LS engine.

It would be simpler to get a complete pullout (engine, trans, harness and computers) together

Depending on which generation engine you go with will tell you what you need. A 4th gen engine (LS3 or whatever truck engine) will need an E67 pcm, meaning you will need a T42 tcm for the trans.

There is still alot of other stuff

06H3 did a swap on an 06 and his was a complete pullout.

Sent from my SM-G920F using Tapatalk

 

[f5moab]

I want/need to do an engine swap soon and I'm trying to figure out this ECU and TCU issue. I have an 06' and I believe from what I've read is that the 4L60e doesn't have a TCU. Correct me if I'm wrong. Now if I decide to swap in lets say a L92 or LS3 and use the donor cars ECU and wiring harness can I use my 4L60e that doesn't have a TCU or do I need the 4L60e with a TCU to work with the donor ECU?

Technically, there was a Powertrain control module that contained the circuitry and electronics for both the engine and the transmission; all in ONE module. I believe in 2008, GM went to two separate modules; engine control module (ECM) and a separate trans control module TCM).

 

[alrock]

Technically, there was a Powertrain control module that contained the circuitry and electronics for both the engine and the transmission; all in ONE module. I believe in 2008, GM went to two separate modules; engine control module (ECM) and a separate trans control module TCM).

Exactly. For example, if you wanted a PCM of NC tune you send in the PCM for your 06 or 07 and they tune everything, including shift points. Newer H3s require two modules to be sent in and they are right next to each other in the engine bay.

And what was said above about 07 having an extra speed sensor - that is correct. If you are using a newer PCM but an 06 trans, you'll get errors and sometimes erratic operation.