The Official B6 2.7T DIY/Swap Guide

[Rlbarlow2]

Hello everyone. So I got the 2.7t mounted in to my 2004 A4 and got into the wiring with the auto tiptronic trans. Everything seemed to be too good to be true, until it was time to hook power up and see what happened on the Vag-Com. That's when the thunder and lightning struck. Not good news for me. Being that the TCM is mounted right under the ECM in the cowl on the B6, the communication wires go from one, right into the other. On an Allroad, the TCM is mounted under the seat and the communication wires go from there to the speedo and then to the ECM. The shop that is working on the wiring told me that being that the Allroad TCM is mounted farther away, the speed or wave length of the communication that is sent is different and will not communicate with the 2.7t ECM. I'm in no means a wiring expert but seemed to make sence, just not what I wanted to hear. I'm told the only way to cure this issue is to swap a manual transmission. Seeing if anyone has any ideas or am I stuck swapping the trans also? A 6 speed would obviously be preferred, just not quite in the cards right now. Any ideas would be greatfully helpful. Thank you.

[AudiA4_20T]

Hello everyone. So I got the 2.7t mounted in to my 2004 A4 and got into the wiring with the auto tiptronic trans. Everything seemed to be too good to be true, until it was time to hook power up and see what happened on the Vag-Com. That's when the thunder and lightning struck. Not good news for me. Being that the TCM is mounted right under the ECM in the cowl on the B6, the communication wires go from one, right into the other. On an Allroad, the TCM is mounted under the seat and the communication wires go from there to the speedo and then to the ECM. The shop that is working on the wiring told me that being that the Allroad TCM is mounted farther away, the speed or wave length of the communication that is sent is different and will not communicate with the 2.7t ECM. I'm in no means a wiring expert but seemed to make sence, just not what I wanted to hear. I'm told the only way to cure this issue is to swap a manual transmission. Seeing if anyone has any ideas or am I stuck swapping the trans also? A 6 speed would obviously be preferred, just not quite in the cards right now. Any ideas would be greatfully helpful. Thank you.

Sounds like a load of BS to me, I just don't think they feel like figuring out the wiring.

[Rlbarlow2]

I thought it was weird also. They tell me that everything is fine until the plug the TCM in and all communication is lost. Unplug the TCM and everything comes back up.

[wrcpulsar]

Hi I'm from uk been watching this thread for long time ,is there any wiring info on put a 2003 BES 2.7t into a 2003 1.8T b6 or is the wiring same ason the other 2.7T looms

Many thanks carl

[ADCS]

Hi I'm from uk been watching this thread for long time ,is there any wiring info on put a 2003 BES 2.7t into a 2003 1.8T b6 or is the wiring same ason the other 2.7T looms

Many thanks carl

The APB and BEL 2.7t have different harnesses, pinouts and ECU's so the BES is probably different as well. You need the diagrams for the specific model and year of the donor car and the car receiving the transplant.