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International Automotive Technicians Network
Re: 2011 GM Express 6 speed programming
Posted to Technical Discussion Forum on 3/22/2015

Was the unit in question ordered via VIN?

This says programming is necessary for the six-speeds:

[...] [[...]]

This says they're plug-and-play (which contradicts the above link):

[...] [[...]]

The TEHCMs require programming when replaced separately: ... Login to read more.