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Monte Howard · 11-11-2021, 09:14 AM

I have a 2001 GMC 2500 HD, the ECM isn’t sending a pulse signal to the #4 injector. So I need to purchase a new ECM I am assuming. Anyone have experience upgrading the ECM on these 8.1 chevys for more performance for towing?

11-11-2021, 09:14 AM	#1
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 268 Likes: 1 Liked 48 Times in 14 Posts	2001 gmc 8.1 ECM upgrade question I have a 2001 GMC 2500 HD, the ECM isn’t sending a pulse signal to the #4 injector. So I need to purchase a new ECM I am assuming. Anyone have experience upgrading the ECM on these 8.1 chevys for more performance for towing? __________________ Monte Howard 3209 STK, 3208 SS