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Doing a 2013 LML/Allison swap into a 2015 Yukon. Its fully mounted and wired..


Im currently stuck with a Theft deterrent dash message and the ECM will not fire the motor because of the modules not getting along. I had a guy come out with a GM programmer and did a Theft relearn but it would re-trigger at the next key cycle. The thought is that the modules need programmed to a matching VIN. Problem is that changing the VIN in a module triggers a reflash. Well I cant change the Truck's/ECM/TCM to the Yukon VIN and I cant change the Yukon's BCM to the trucks VIN (got to keep the BCM's function Yukon and not truck) but I wanted to try changing the TDM's (Theft module) VIN to match the Truck's ECM/TCM to see if that makes the system happy. I cant find the TDM. Im guessing its in the BCM.

Can anyone throw me a bone?
Where is the TDM (theft deterrent module
 

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You said 'Where is the TDM (theft deterrent modue), now you say 'not actually the TCM'. Which one are you looking for?? TCM isusually br the radiator support on the drivers side of the cooling stack near the aux battery. That's where it is on my 2008 model.
 
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