Adding TCM to E67 ECM in 2006 CTS-V

[iambigperm]

I keep toying with the idea of putting a 4L80e in my CTS-V instead of the 6 speed manual. It has a E67 ECM and I would obviously need to add a TCM. Is the existing E67 capable of playing nice with a TCM?

If I change the tune transmission setting to "automatic", wire in a T42 TCM, and then read the tune will it populate the automatic parameters in the tune? I've googled this to no end and haven't found much. I could be way off...

[mowton]

My limited understanding is yes. EFI Connections states the E67 is compatible to the 4l60 and 4l80 TCM. Assume a segment swap would be in order as well as some re-wiring.

http://www.eficonnection.com/eficonn...ramjet350.aspx

sorry, best I can do :-)

Ed M

[DSteck]

There's no segment swapping involved. The problem is you'd have to find a proper operating system that can still communicate with things on the CAN bus as well as use serial communication. It'll be extremely tough to make work.

[iambigperm]

There's no segment swapping involved. The problem is you'd have to find a proper operating system that can still communicate with things on the CAN bus as well as use serial communication. It'll be extremely tough to make work.

You are referring to the TCM OS right? How would one know which TCM would work or would it be more of trial and error? I appreciate your input.

[DSteck]

Both controllers. You won't just change a flag or two in your ECM to make it communicate with a TCM.

[iambigperm]

Both controllers. You won't just change a flag or two in your ECM to make it communicate with a TCM.

As you were alluding to... If I had to change both, I'd probably never get the rest of the gadgets to work as they should. Now I'm curious... What is the drop down selection for transmission type good for? Does it do anything?

[Montecarlodrag]

You need a ECM with an auto OS so it has the proper logic to communicate with the TCM, changing the Auto/Manual parameter will not do it (there are airflow and torque calculations the ECM needs to send to the TCM so it shifts properly without burning the transmission).
Then you need to find a T42 TCM from same year (or close) so it talks with the ECM. The easy way to know is hooking both of them to a bench harness and read entire. If HPT reads both controllers you are one step closer.

The closest combination using a 4L80E will be a truck and I don't think using a calibration from one will work good since you may lose some things like cluster, DIC etc.
It's possible but very hard to accomplish and you may need to sacrifice something.
Devices on the CAN bus are more straightforward, the problem is going to be devices on the low-speed gmlan, you may lose some of them if you change the OS to another one without the options, or you may get a lot of DIC errors/cluster lights.

[DSteck]

Being able to read two controllers on a bench doesn't do much honestly. I can stick an E40 on a bench with a T43 and read the file out. The V1 sucks because it has serial communications straight off the ECM instead of using the BCM as a pass through.

[Montecarlodrag]

Being able to read two controllers on a bench doesn't do much honestly. I can stick an E40 on a bench with a T43 and read the file out. The V1 sucks because it has serial communications straight off the ECM instead of using the BCM as a pass through.

I agree. However there are instances when ECM-TCM will not even talk to each other in a bench let alone a car's CAN Bus, so trying to make them work in the car is pointless.

[Jon S.]

I keep toying with the idea of putting a 4L80e in my CTS-V instead of the 6 speed manual. It has a E67 ECM and I would obviously need to add a TCM. Is the existing E67 capable of playing nice with a TCM?

If I change the tune transmission setting to "automatic", wire in a T42 TCM, and then read the tune will it populate the automatic parameters in the tune? I've googled this to no end and haven't found much. I could be way off...

You will need the ability to flash the T42 with a variety of calibrations, and no guarantee that you will be completely successful. TIS would be the best resource for this.

The 2007 CTS-V calibration is very similar to the 2007 TBSS calibration - many parameters are at the same address in Hex. This leads me to believe that you might get a 2007 CTS-V to work with a 4L70. The 2006 CTS-V calibration is very different from the 2007 CTS-V, and may not be T42 friendly at all.

The 2007 TBSS calibration is not readily 4L80 friendly - it seems to use an older (or early) Canbus protocol - and doesn't work well with a 4L80 T42 calibration from a full-size truck.

The bottom line is that you will need programming tools beyond HPT, and knowledge beyond the average tuner.

[eclipse5302]

Old topic, I know, but I just got done making this work. 2007 TBSS with a 4L80, E67 and T42. Jon is right on the money regarding the CAN protocol being older / early in the 2007 TBSS.

I spend two days with a Tech 2 trying different calibrations - 2007-2009 Chevy Express vans, diesel or gas. The 2007 ECM wouldn't talk with any 4L80 TCM - I'd get U1000 codes about the TCM not being able to talk to the ECM, PRNDL display stuck in "1", etc.

However, after flashing the ECM up to a 2008 TBSS, I was able to make a 2008 Chevy Express T42 TCM work with it. And, the (now 2008) ECM talked happily with everything else in the truck that was 2007. I presume this worked because the TBSS only used CAN for the ECM-TCM communications, and everything else was done over the serial bus.

[DSteck]

4L80 in a TBSS is easy and doesn't even require a new TCM file (just wiring changes and some settings in HPT). I'm pretty sure I have a T42 4L80 file that's compatible with 07 TBSS though.

Converting a V1 is a whole other story.

[ajjones44]

I know this post is old but I'm reaching out to see if there are any new solutions to this. I have a 2012 CTS-V motor and 4L80 going in a 96 Impala. e67 ECU and T42 TCM. Thanks.

[yellz06]

Just use any 2012 CTSV auto OS. it should work...