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jmg343 07-23-2005, 01:42 AM Can someone explain these to me please? I think Ive got a grasp on the ECM and TCM. Engine and Transmission control modules if Im not mistaken. What is the PCM? And any info that I might not know about the TCM and ECM you wanna throw in couldnt hurt either. thanks Cougar281 07-23-2005, 02:11 AM Powertrain Control Module. Not fount on our trucks. Often found in Furds. ECM and TCM in one module, hence Powerain Control Module. SmoknDmax 07-23-2005, 02:41 AM PCM - Powertrain Control Module is used on the DMAX. From what I can tell, all 3 are identified on GM trucks. ECM and PCM are usually paired up. The PCM controls a lot of the functions that are not specific to just the engine or just the transmission. I believe it covers the 4x4 system, PTO functions, etc. | ||