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**Gregski** · 06-01-2019, 10:18 PM

so as you ride shotgun with me on this my first LS Journey, I would like to document and share all of the LS Lessons Learned aka LSLLs for the fans and prosperity

the first thing my buddy who owns an LS2 equipped Chevy Trailblazer asked when I shared with him I scored an "LS" enjin and transmission, was: "Did you get the TCM?" huh what? I responded, what the hewk is a TCM

the Transmission Control Module he replied, earning my blank stare, ha ha

which brings us to Lesson Learned # 1.

LS Lesson Learned #1 - we are going to call this there are Three Kinds of Computers, although that's not what we really mean, but allow me to explain

PCM stands for Power Control Module, this is what our LS truck engines come with 1999-07 respectfully this single computer box controls both the engine and transmission

ECM aka Engine Control Module, you guessed it, the ECM controls the engine alone

vehicles with ECMs have a separate cousin box called the TCM which is the Transmission Control Module I guess, I really am not up on that, but that's as far as I go

06-01-2019, 10:18 PM	#5989
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,803	Re: Restoring Rusty - LS Lessons Learned so as you ride shotgun with me on this my first LS Journey, I would like to document and share all of the LS Lessons Learned aka LSLLs for the fans and prosperity the first thing my buddy who owns an LS2 equipped Chevy Trailblazer asked when I shared with him I scored an "LS" enjin and transmission, was: "Did you get the TCM?" huh what? I responded, what the hewk is a TCM the Transmission Control Module he replied, earning my blank stare, ha ha which brings us to Lesson Learned # 1. LS Lesson Learned #1 - we are going to call this there are Three Kinds of Computers, although that's not what we really mean, but allow me to explain PCM stands for Power Control Module, this is what our LS truck engines come with 1999-07 respectfully this single computer box controls both the engine and transmission ECM aka Engine Control Module, you guessed it, the ECM controls the engine alone vehicles with ECMs have a separate cousin box called the TCM which is the Transmission Control Module I guess, I really am not up on that, but that's as far as I go Last edited by Gregski; 06-13-2019 at 10:43 AM.