Touareg: 2014 V6 TDI
Join Date: Jan 2018
Thanked 8 Times in 8 Posts
Just put a 2013 750 AK TCM into my 2014 from the Motherland. Original was a 2014 750 CF TCM.
If I had it all to do over again.... I'd see if Yrktreg would allow you to do a package deal, for, say $500, where you submit both your ECM for a stock back to original tune fueling map, and a stock back to original tune for your Trans Control Module, AT THE SAME TIME, to save on shipping and handling costs, and to improve his efficiency in the matter.
When he has a Stock fuel mapping tune that will get me through CARB bi annual tests, or if he needs a ECM to work with, I'll volunteer mine from a 2014 TDI LUX.
If I could only afford to do one, I would absolutely do just the ECM fuel mapping reflash, back to original. The TCM suffers from screwed up throttle input being so deep into the pedal, fooling the TCM to still hold the gear for too long. The factory fuel map flashing pre CARB allows the engine to make the proper torque and HP to properly drive the input shift points to the remapped TCM, so it shifts where the torque is, instead of causing the TCM to hold lower gears for far too long. Everything on this powertrain depends on the motor being able to make the torque it's capable of with the stock ECM flash at 1500 to 2500-2700 RPM's. The fixed CARB /EPA reflash destroys this. I feel that the ECM flash is the most important.
Do a ECM retune by pulling that out from under the cowling near the hood, first, and then later, do the TCM, if you can't afford both, at the same time.
If you live in non hilly areas, that are flat, and don't trailer much, the TCU fix might be enough for you. I live in a mountainous state, and I tow a travel trailer. Without the torque being there with the neutered fix tune, regardless of TCU tune you run, it won't hold the taller gear, without the transmission hunting and seeking enough torque from the engine, and looking for a gear that will do the work. It needs that original factory fuel mapping, pre diesel-gate.