what is ?

[Robert McClelland]

I am going to take my 2001 in tomorrow for a re program I think on my board. My question is I will ask for a tcm/ecm/pcm upgrade. what is tcm/pcm ecm .

[GMC-2002-Dmax]

Robert McClelland,

ECM - engine control module
TCM - trans. control module
PCM - power??? control module

JUST A GUESS.

GMC