Programming a BCM

[impynyc]

Does anybody know if you can custom program a BCM.
I am having issues converting my 2008 TB LT from 4WD to 2WD. The TCCM cannot be disconnected without upsetting the BCM. 4WD BCM programming is looking for TCCM. I cannot plug in a BCM from a 2WD truck because the VIN information is in the BCM and will upset the truck. Does anybody know how to change the VIN on a BCM?

Tks

 

[djthumper]

Afraid that may be a trip to the dealer.

 

[impynyc]

My good friend is a tech at a GM dealer. He explained when you program a new BCM it is loaded via the VIN. He does not believe you can alter an existing BCM that has been programmed. The tech 2 does not have any opitions to make changes. If anyone has any ideas please let me know

 

[The_Roadie]

You could always leave in the TCCM and front axle actuator, and hide the connected-up encoder motor somewhere to fool the TCCM into thinking it really controlled something. Then the light should stay off.

 

[impynyc]

Roadie I agree with you I and was thinking of leaving all the 4WD components pluged in but I may have a problem with the 2 speed (VSS) that will missing when the t case is out. Unless I remove the VSS sensors from the t case and pluged them into wiring harness.

Thank you all for your input.

 

[jimmyjam]

codes thrown by missing VSS sensors should be able to be tuned out via hptuners

one of them should plug into the tailshaft housing of a 2wd tranny though

 

[impynyc]

There are 3 VSS sensors on 4WD TB LT. 2 for the 4WD T case. I have to look into HP tuners